CBSE Class 12 Biology Sexual Reproduction In Flowering Plants VBQs

CBSE Class 12 Biology Sexual Reproduction In Flowering Plants VBQs read and download in pdf. Value Based Questions come in exams for Biology in Class 12 and are easy to learn and helpful in scoring good marks. You can refer to more chapter wise VBQs for Class 12 Biology and also get latest topic wise very useful study material as per latest NCERT book for Class 12 Biology and all other subjects for free on Studiestoday designed as per latest Class 12 CBSE, NCERT and KVS syllabus and examination pattern

VBQ for Class 12 Biology Chapter 2 Sexual Reproduction In Flowering Plants

Class 12 Biology students should refer to the following value based questions with answers for Chapter 2 Sexual Reproduction In Flowering Plants in Class 12. These VBQ questions with answers for Class 12 Biology will come in exams and help you to score good marks

Chapter 2 Sexual Reproduction In Flowering Plants VBQ Questions Class 12 Biology with Answers

 

Question. Syngamy and triple fusion is called …A… . The central cell becomes …B… develop into …C… and zygote develops into …D… .A, B, C and D in the above statements are
(a) A–fusion, B–haploid, C–diploid cell, D–embryo
(b) A–double fertilisation, B–PEC, C–endosperm, D–embryo
(c) A–embryo, B–endosperm, C–PEC, D–diploid cell
(d) A–PEC, B–endosperm, C–syngamy, D–fertilisation
Answer : B


Question. If stem has 2n =10 number of chromosomes then find out

A – number of chromosome in endosperm.
B – number of chromosome in egg cell.
C – number of chromosome in polar nuclei, respectively.
(a) 15, 15, 20
(b) 10, 15, 20
(c) 15, 5, 10
(d) 10, 5, 15
Answer : C


Question. If endosperm has 36 number of chromosomes then find out the chromosome number of male and female gamete.

(a) 18, 18
(b) 17, 18
(c) 20, 20
(d) 12, 12
Answer : D


Question. PEC (Primary Endosperm Cell) is formed

(a) after triple fusion
(b) before triple fusion
(c) at the time of syngamy
(d) always persisted
Answer : A


Question. In an angiosperm, male plant is diploid and female plant is tetraploid then endosperm will be

(a) haploid
(b) triploid
(c) tetraploid
(d) pentaploid
Answer : D


Question. In angiosperm, pollen tube librates their male gametes into the

(a) central cell
(b) antipodal cell
(c) egg cell
(d) synergids
Answer : D


Question. Out of the following choose the post-fertilisation event(s).

(a) Endospermogenesis
(b) Embryogenesis
(c) Both (a) and (b)
(d) Megasporogenesis
Answer : C


Question. The morphological nature of the edible part of coconut is 

(a) perisperm
(b) cotyledon
(c) endosperm
(d) pericarp
Answer : C


Question. Coconut water from a tender coconut is

(a) immature embryo 
(b) free-nuclear endosperm
(c) innermost layers of the seed coat
(d) degenerated nucellus
Answer : B


Question. Endosperm is consumed by developing embryo in the 
seed of
(a) pea
(b) maize
(c) coconut
(d) castor
Answer : A

 

Embryo, Seed and Fruit Formation

Question. A typical dicotyledonous embryo consist of an …A… axis and …B… cotyledons.
The portion of embryonal axis above the level of cotyledons is …C… which terminates with the …D… or stem tip.
A, B, C and D in the above statement are
(a) A–plumule, B–epicotyl, C–cotyledons, D–embryonal
(b) A–embryonal, B–two, C–epicotyl, D–plumule
(c) A–embryonal, B–epicotyl, C–cotyledons, D–plumule
(d) A–embryonal, B–plumule, C–cotyledons, D–epicotyl
Answer : B


Question. The cylindrical portion below the cotyledons is …A… that terminates to …B… and its tip is called …C… . A, B and C here refers to

(a) A–radicle, B–hypocotyl, C–root cap
(b) A–root cap, B–radicle, C–hypocotyl
(c) A–hypocotyl, B–root cap, C–radicle
(d) A–hypocotyl, B–radicle, C–root cap
Answer : D


Question. The wheat grain has an embryo with one large, shield-shaped cotyledon known as 

(a) epiblast
(b) coleorhiza
(c) scutellum
(d) caleoptile
Answer : D


Question. Number of seeds are equal to the

(a) number of ovules
(b) number of ovaries
(c) Both (a) and (b)
(d) None of these
Answer : A


Question. Persistent nucellus in the seed is known as 

(a) perisperm
(b) hilum
(c) tegmen
(d) chalaza
Answer : A


Question. Which is most crucial for seed storage?

(a) Dehydration and dormancy
(b) Endosperm and water
(c) Least amount of development
(d) Endosperm in large quantity
Answer : A


Question. True fruit is directly derived from

(a) stem
(b) root
(c) ovary
(d) None of these
Answer : C


Question. False fruit is a fruit in which

(a) only ovary take part in fruit development
(b) only embryo take part in fruit development
(c) only chalazal cells take part in fruit development
(d) ovary and other floral part are included in fruit development
Answer : D


Question. Thalamus contributes in the fruit formation in

(a) apple
(b) strawberry
(c) cashewnut
(d) All of these
Answer : D


Question. The world’s oldest viable seed, excavated from Arctic Tundra is of

(a) lupine
(b) Ficus
(c) date palm
(d) Phoenix
Answer : A


Question. Viability of date palm (Phoenix dactylifera) seed is

(a) 2000 yrs
(b) 1000 yrs
(c) 500 yrs
(d) 100 yrs
Answer : A


Question. Seed formation without fertilisation in flowering plants involves the process of

(a) budding
(b) somatic hybridisation
(c) apomixis
(d) sporulation
Answer : C


Question. Type of cell division takes place in apomixis is

(a) reductional
(b) meiosis
(c) Both (a) and (b)
(d) mitosis
Answer : D


Question. Ovules contain many embryo in

(a) Citrus
(b) apple
(c) mango
(d) Both (a) and (c)
Answer : D


Question. Occurrence of more than one embryo is called

(a) polyembryony
(b) embryony
(c) parthenogenesis
(d) fertilisation
Answer : A


Question. Vegetative/Asexual reproduction and apomixis are common to each other in

(a) type of cell division
(b) clone nature of offspring
(c) Both (a) and (b)
(d) only in dicot plant
Answer : C


Question. Nucellar polyembryony is reported in

(a) Gossypium
(b) Triticum
(c) Brassica
(d) Citrus
Answer : D


Question. Apomictic embryos in Citrus arise from

(a) synergids
(b) maternal sporophytic tissue in ovule
(c) antipodal cell
(d) haploid egg
Answer : B

 

Assertion and Reason

In each of the following questions, a statement of Assertion (A) is given followed by corresponding statement of Reason (R). Of the statements, mark the correct answer as
(a) If both A and R are true and R is correct explanation of A
(b) If both A and R are true, but R is not the correct explanation of A
(c) If A is true, but R is false
(d) If A is false, but R is true

Question. Assertion (A) Gynoecium consists of pistil.
Reason (R) It represents the male reproductive part in flowering plants.
Answer : C


Question. Assertion (A)
 Meiosis is the cell division which occurs in the sexually reproducing organisms.
Reason (R) Meiotic cell division results into two cells having exactly same genetic makeup.
Answer : C


Question. Assertion (A)
 Flowers are the structures related to sexual reproduction in flowering plants.
Reason (R) Various embryological processes of plants occur in a flower.
Answer : A


Question. Assertion (A)
 Megaspore mother cell undergoes meiosis to produce four megaspores.
Reason (R) Megaspore mother cell and megaspore both are haploid.
Answer : C


Question. Assertion (A)
 Pollen grain of angiosperm is considered as the male gametophyte.
Reason (R) Pollen grain contains stigma, style and ovary.
Answer : C


Question. Assertion (A)
 Geitonogamy is genetically similar to autogamy.
Reason (R) In geitonogamy, pollen grains come from the same plant.
Answer : A


Question. Assertion (A)
 Cleistogamous flowers produce assured seed set in the absence of pollinators.
Reason (R) Cleistogamous flowers do not open at all.
Answer : A


Question. Assertion (A)
 Removal of anthers is first step in artificial hybridisation.
Reason (R) It prevents contamination of anthers.
Answer : C


Question. Assertion (A)
 Endosperm development preceds embryo development.
Reason (R) It assures nutrition to the developing embryo.
Answer : A


Question. Assertion (A)
 Non-albuminous seeds have no residual endosperm.
Reason (R) The endosperm is completely consumed during embryo development.
Answer : A


Question. Assertion (A)
 Mango is a false fruit.
Reason (R) The thalamus also contributes to fruit formation in false fruits.
Answer : D


Question. Assertion (A)
 Some fruits are seedless or contain non-viable seeds.
Reason (R) They are produced without fertilisation.
Answer : A


Question. Assertion (A)
 In apomixis, plants of new genetic variations are not produced.
Reason (R) In apomixis, reductional division takes place.
Answer : C


Question. Assertion
 Parthenocarpy involves the formation of seedless fruits. 
Reason Apomixis occurs without fertilisation.
Answer : B


Question. Assertion
 In apomixis, the plants of new genetic sequence are produced. 
Reason In apomixis, two organisms of same genetic sequence meet.
Answer : D

 

Statement Based Questions

Question. Read the following statements and choose the correct ones.
I. Non-essential floral organs in a flower are sepals and petals.
II. Stamens represent microsporophylls.
III. Adithecious anther consists of four microsporangia two in each lobe.
IV. The anther wall has middle layer lieing between endothecium and tapetum.
(a) I and II
(b) II and III
(c) III and IV
(d) I, II, III and IV
Answer : D


Question. Which one of the following statement is correct?

(a) Hard outer layer of pollen is called intine
(b) Sporogenous tissue is haploid
(c) Endothecium produces the microspores
(d) Tapetum nourishes the developing pollen
Answer : D


Question. Self-incompatibility is a device for

I. ensuring cross-pollination.
II. preventing self-fertilisation.
III. ensuring self-fertilisation.
IV. genetic control for self-fertilisation.
Choose the correct statements from those given  above.
(a) I, II and III
(b) I, II, III and IV
(c) I, III and IV
(d) I, II and IV
Answer : D


Question. Which of the following statement(s) is/are correct?

I. The stigma serves as a landing platform for pollen grains.
II. Ovarian cavity is also known as ovarian locule and is present inside the ovary.
III. Placenta is located inside the ovarian cavity.
IV. The ovule is attached to the placenta by funicle.
(a) I, II and III
(b) I, II and IV
(c) I and III
(d) I, II, III and IV
Answer : D


Question. Read the following statements.

I. Generative cell is bigger and contains abundant food reserve.
II. Vegetative cell is small and floats in the cytoplasm of the generative cell.
III. In angiosperms various stages of reductional divisions can be studied in young anthers.
IV. Hilum represents the junctions between ovule and funicle.
Choose the option with correct set of statements.
(a) I and II
(b) I and III
(c) II and IV
(d) III and IV
Answer : D


Question. Read the following statements and choose the correct statements.

I. Heterostyly as a contrivance for cross-pollination is
found in Primula vulgaris.
II. Cleistogamous flower is present in Commelina.
III. Tallest flower are of Amorphophallus.
IV. In monoecious condition, both male and female flowers are borne on same plant, an example of such plant is Cucurbita.
(a) I and II
(b) II and III
(c) III and IV
(d) I, II, III and IV
Answer : D


Question. Read the following statements and choose the correct ones.

I. Mature ovules in which micropyle comes to lie close to
the funiculus the ovule is anatropous.
II. When micropyle, chalaza and hilum lie in a straight
line the ovule is said to be orthotropous.
III. Megasporangium along with its protective integument is called ovule.
(a) I and II
(b) II and III
(c) I and III
(d) I, II and III
Answer : D


Question. Consider the following statements.

I. Pollination by bats is known as chiropterophily.
II. Pollination by ants is known as ornithophily.
(a) Both statements I and II are true
(b) Statements I is true, but II is false
(c) Statements I is false, but II is true
(d) Both statements I and II are false
Answer : B


Question. Which one of the following statement is incorrect about pollination?

(a) Anemophily is by wind and occurs in grasses and date palm
(b) Hydrophily is by water and occurs in Zostera, Vallisneria and Ceratophyllum
(c) Entomophily is by insects and occurs in rose, jasmine, Salvia, etc.
(d) Ornithophily is by birds and occurs in Adansonia
Answer : D


Question. Which of the following statement(s) is/are correct about Parthenium (carrot grass)?

(a) Parthenium came into India as a contaminant with imported wheat
(b) It has became ubiquitous in occurrence
(c) It causes pollen allergy
(d) All of the above
Answer : D


Question. Choose the incorrect statement from the following.

(a) Long ribbon-like pollen grains are seen in some aquatic plants
(b) In some insect species, the floral reward for pollination is the safe place to lay eggs in the flower
(c) Insect robbers consume pollens or nectar without bringing about pollination
(d) Majority of the flowering plants produce homosexual flowers
Answer : D

 
Question. Refer to the given characteristics of some flowers :

I. Flowers are small. They are often packed in inflorescence.
II. Flowers are colourless, nectarless and odourless
III. Well exposed stamens.
IV. Pollen grains produced in large number, light and non-sticky.
V. Flowers often have a single ovule in each ovary.
VI. Stigma-large, often feathery.
The above features are the characteristics of
(a) Self-pollination
(b) Anemophily (pollination by wind)
(c) Ornithophily (pollination by birds)
(d) Entomophily (pollination by insects)
Answer : B


Question. The events in pollen-pistil interaction are given below.

I. Pollen grain germinates to form pollen tube.
II. Pollen tube enters the ovule through micropyle.
III. Pollen grain reaches the stigma.
IV. Pollen tube grows through the tissues of stigma and style and reaches the ovary.
The sequential order of their occurrence is
(a) III→ I→ IV→ II
(b) II→ IV→ III→ I
(c) III→ IV→ II→ I
(d) II→ III→ I→ IV
Answer : A


Question. Which of the following statement is correct?

(a) Pollination gives the guarantee of the promotion of post-pollination events that lead to fertilisation
(b) The events ‘from pollen deposition on stigma until pollen tubes enter the ovule’ are together referred to as pollen-pistil interaction
(c) Pollen-pistil interaction is a dynamic process involving pollen recognition followed by only promotion (not rejection) of the pollen
(d) Pistil has no ability to recognise the pollen, whether right or wrong type
Answer : B


Question. Study the following and find correct statement(s).

I. Pollination by water is quite rare in flowering plants and is limited to about 50 genera, mostly monocotyledons.
II. Water is a regular mode of transport for the male
gametes among higher plant groups.
III. Distribution of bryophytes and pteridophytes are limited because of the need of water for transport of male gametes and fertilisation.
(a) Only I
(b) II and III
(c) Only III
(d) Only II
Answer : C


Question. Read the following statements.

I. Double fertilisation was discovered by Nawaschin in Lilium and Fritillaria.
II. The total number of nuclei involved in double fertilisation is five.
III. The central cell of embryo sac, as a result of triple fusion becomes primary endosperm cell (PEC).
IV. Synergids are haploid.
Choose the correct set of statements.
(a) I, II and III
(b) II and IV
(c) I, III and IV
(d) I, II, III and IV
Answer : D


Question. Find out the correct statement(s).

I. Most commonendosperm is of nuclear type.
II. Coconut water is male gametophyte.
III. Coconut has both free-nuclear and cellular type of endosperm.
(a) I, II and III
(b) I and III
(c) II and III
(d) I and II
Answer : B


Question. Find out the correct statement(s).

I. Endosperm formation is the prior event than embryo formation.
II. Angiospermic and gymnospermic endosperm are 3n and n, respectively.
III. Endospermic seeds are found in castor, barley and coconut.
IV. In albuminous seed, food is stored in endosperm and in non-albuminous seeds, it is strored in cotyledons.
(a) I and IV
(b) II and III
(c) I and III
(d) I, II, III and IV
Answer : D

 

Matching Type Questions

Question. Match the following columns.
Column I                                    Column II
A. Outer integuments                 1. Testa
B. Inner integuments                 2. Tegmen
C. Ovary                                   3. Fruit
D. Ovules                                  4. Seed
Codes
    A B C D 
(a) 1 3 2 4
(b) 3 4 1 2
(c) 1 2 3 4
(d) 4 3 2 1
Answer : C


Question. Match the following columns.

Column I                  Column II
(Ovary)                      (Pistil)
A. Monocarpellary      1. Free pistil
B. Multicarpellary       2. Fused pistil
C. Syncarpous           3. Many pistil
D. Apocarpous           4. Single pistil
Codes
     A B C D
(a) 1 2 3 4
(b) 4 3 2 1
(c) 3 4 2 1
(d) 4 3 1 2
Answer : B


Question. Match the following columns.

Column I                  Column II
A. Antipodal             1. 3n
B. Central cell           2. 2n
C. MMC                    3. (n + n)
D. Endosperm           4. n
Codes
     A B C D
(a) 4 3 1 2
(b) 3 2 1 4
(c) 4 3 2 1
(d) 3 4 1 2
Answer : C


Question. Match the following columns.

Column I                                Column II
(Seeds / Fruits)                     (Examples)
A. Endospermic seed              1. Wheat
B. Non-endospermic seed       2. Mango
C. True fruit                          3. Cashew
D. False fruit                         4. Pea
Codes
    A B C D 
(a) 4 2 3 1
(b) 1 4 2 3
(c) 1 3 2 4
(d) 4 3 2 1
Answer : B

Very Short Answer Type Questions

Question. Where are a plant’s sex organs located ?
Answer : In flowers

Question. What is the function of a flower ?
Answer : The function of a flower is to carry out sexual reproduction in plants through the formation of male and female gametes. Flowers ensure that the gametes fertilise to form seeds that further help in reproducing plants.

Question. What is the name of sex cells (other than gametes) ?
Answer : Germ cells

Question. Name the male and female gametes in animals.
Answer : In animals, the male gamete is known as sperm and the female gamete is known as ovum (egg).

Question. Where is the male gamete formed :
(i) in humans ?
(ii) in flowering plants ?
Answer : (i) Testes (ii) Anther

Question. Where is the female gamete formed :
(i) in humans ?
(ii) in flowering plants ?
Answer : (i) Ovary (ii) Ovary

Question. What are the reproductive organs in a flower ?
Answer : Stamen and carpel are the reproductive organs of a flower.

Question. What is the name of :
(a) male part of a flower ?
(b) female part of a flower ?
Answer : (a) The male part of a flower is called stamen.
(b) The female part of a flower is called carpel.

Question. What is the name of female organ of a flower (other than carpel) ?
Answer : Pistil

Question. What is the other name of sex cells ?
Answer : Gametes

Question. What is the causative organism for the following diseases ?
(i) Gonorrhoea (ii) Syphilis (iii) AIDS
Answer : (i) Bacteria (ii) Bacteria (iii) Virus

Question. What are the organs in humans which produce the gametes ?
Answer : In males, testes produce male gametes called sperms; and in females, ovary produces female gametes called eggs.

Question. (a) What are the male sex cells in humans called ?
(b) Name the organ which produces male sex cells.
Answer : (a) The male sex cells in humans are called sperms.
(b) Testes produce male sex cells.

Question. Name the liquid that contains sperms.
Answer : Semen

Question. What is the name of the process in which thickened uterus lining alongwith blood vessels is removed from the body of a human female through vaginal bleeding ?
Answer : Menstruation

Question. (a) For how much time does menstruation last in human females (or women) ?
(b) What is the frequency of menstrual cycle in human females (or women) ?
Answer : (a) 3 to 5 days (b) Once every 28 days

Question. (a) What are the female sex cells in humans called ?
(b) Name the organ which produces female sex cells.
Answer : (a) The female sex cells in humans are called ova or eggs.
(b) Ovary produces the female sex cells.

Question. Name two animals which undergo external fertilisation and two animals which undergo internal fertilisation ?
Answer : External fertilisation : Frog and Fish ; Internal fertilisation : Dogs and Cows

Question. Define sexual reproduction.
Answer : sexual reproduction, the production of new organisms by the combination of genetic information of two individuals of different sexes. In most species the genetic information is carried on chromosomes in the nucleus of reproductive cells called gametes, which then fuse to form a diploid zygote. The zygote develops into a new individual. Sexual reproduction is the dominant form of reproduction in living beings.

Question. Do all organisms give birth to individuals like humans ?
Answer : No

Question. Write the full forms of the following as they occur in biology :
(i) STD (ii) AIDS (iii) HIV
Answer : i STD – Sexually Transmitted Diseases. ii AIDS – Acquired Immune Deficiency Syndrome.iii HIV – Human Immunodeficiency virus.

Question. Which part of the human body :
(a) produces sperms ?
(b) produces ova ?
(c) passes sperms from a man to a woman ?
Answer : (a) Testes (b) Ovaries (c) Penis

Question. (a) What do the testes in a man produce ?
(b) What do the ovaries in a woman produce ?
Answer : (a) The testes of a man produce male gametes called sperms.
(b) The ovary of a woman produces female gametes called eggs or ova.

Question. (a) Where in the human body does an ovum get fertilised ?
(b) Where does a fertilised ovum develop into a baby in the human body ?
Answer : (a) Oviduct (or Fallopian tube) (b) Uterus (or Womb)

 Fill in the following blanks with suitable words :
(a) Pollen grains contain ................ gametes of a plant.
(b) Ovules contain ................ gametes of a plant.
(c) The ovary of a flower becomes ................ after fertilisation.
(d) The ovule becomes a .......... after fertilisation.
(e) Flowering plants reproduce by.................method of reproduction.
(f) The female organ of reproduction in the flower is the...................
(g) The male organ of reproduction in the flower is the.................... .
(h) The name of the structure in the flower in which the male gamete is formed is............
(i) The................ at the base of the carpel contains egg cells.
(j) The term used to refer to the transfer of pollen from the stamen of one flower to the carpel of another flower of the same species is................
(k) The cells involved in sexual reproduction are called ................
(l) Fusion of gametes gives rise to a single cell called ................
(m) The process of fusion of gametes is called ................
(n) A multicellular animal starts its life from a ................ through sexual reproduction.
(o) The union of a sperm nucleus with an egg nucleus is known as.................... and results in a ..................egg.
(p) The menstrual cycle is controlled by......................
Answer : (a) male (b) female (c) fruit (d) seed (e) sexual (f) carpel (g) stamen (h) anther (i) ovary (j) cross-pollination (k) gametes (l) zygote (m) fertilisation (n) single cell (zygote) (o) fertilisation ; fertilised (p) hormones

UNIT X- ECOLOGY

• The city government is planning to bring metro rail to your area. But this will require around 10,000 trees to be cut. Do you think govt. should go ahead with the project? Justify your answer?
• Yes. But the track of metro should be so changed that minimum no of trees are cut. Track can be made underground and more trees can be planted after the project is over.

Values
• Sensitivity towards environment
• Decision making.
• You find that a lake in your neighboring area has been covered by Water hyacinth. You have contacted your friends to remove this weed. Nobody agrees to support you .How will you explain the necessity of this?
• Friends should be explained the process of natural ageing of a lake by mineral enrichment of water. (eutrophication) which is harmful to aquatic life .

Values
• Problem solving
• Critical thinking.
• Responsibility
• Now a days we see that people use CD’s and DVD’s for storing information, movies and songs. Do you think these things create pollution?
• Yes. Because all this material contain heavy metals and toxics substances and known as e-wastes.

Values
• Concern about environment
• Awareness.
• Government of India has launched clean Ganga programe by the name Ganga Action Plan. Do you want to be a part of it? How?
• Yes I will start awareness programs like Nukkad Nataks, rallies and slogans making to keep the river clean.

Values
• Innovation
• Service to society
• You have read the newspaper reports that lots of cows die because of polythene bags getting entangled in their intestine. You go to market and see vegetable vender selling vegetables in plastic bags.What will be your suggestion to -(i) buyer and (ii) seller?

I) Use cloth or jute bag to save environment and thus life of cow II) Use paper bags, polythene are non biodegradable and toxic.

Values
• Sensitivity to words environment
• Concern.
• One of your friends Rakesh has gone to jungle safari with his family. On returning from that safari he is sharing experiences with you and tells that his father who is a businessman hunted a deer with his gun. What will you tell your friend after knowing about their expedition?
• It is unethical and leads to loss of biodiversity and result in imbalance in Eco system.

Values
• Concern about animal.
• Empathy.
• Pankhuri watched a TV program based on life in polar region. She observed that all the animals in polar region possess larger size and smaller animals are not found in that region. She asked about this surprising fact to her friends. Being her friend, how can you satisfy her curiosity?
• Because smaller animals have larger surface area relative their volume so they lose body heat very fast when it is cold outside. They have to expense lot of energy to generate body heat.

Values
• Critical thinking
• Awareness.
• Ajay a notorious boy often involved in destruction of surrounding plants and killing small animals. You are given a responsibility to make him understand about importance of each and every organism present in world. How can you explain him about it and which hypothesis you will use for it?
• Explanation through “Rivet popper hypothesis.

Values
• Social responsibility
• Concerns about eco system.
• A well known personality killed a back buck during hunting in sacred groves of Aravali Hills in Rajasthan. Local people caught him and lodged a case in court against him. He argued that court that killing a human being is a crime but killing a animal is not crime.
• Do you favor his argument? Why?
• What is the role of scared groves? Mention any two names of such places other than Aravali Hills.

A) No because each living organism has its own role in balanced eco system.
B) Sacred groves are culturally protected area where large no of rare and Threatened wild life is given total protection. [Any other two sacred groves]

Values
• Awareness
• Responsibility.
• Anil and Sunil are partners and established a factory. After a few months electrostatic precipitator became out of order. Sunil wanted to replace it but Anil expressed the view that they have no effect of it on productivity as well as income; therefore they should not waste money to replace it.

(a)Out of these partners whom do you support and why?
(b) Suggest any two measures to stop such negligence.
A) I will support Sunil because his approach is eco- friendly.
B) By imposing fine and punishment Cancellation of registration of such industries

Values
• Decision making
• Concern about environment
• A team of research workers observed that the population of fish eating birds is declining every year after the establishment of a pesticide factory nearby five years ago.

(a) What may be the possible reason in your opinion? Explain?
(b) Can you suggest alternative to pesticide so that factory may be stopped.

A) Pesticide entering in food chain and resulting in bio magnifications
• Bio controlling agent to remove pest

Values
• Problem solving
• Critical thinking.
• A few months ago the people of Ramgarh started a bad practice of disposing their waste in the pond of village which was earlier source of drinking water. It resulted in deterioration of quality of water and fish mortality.

(a) What changes do you think have taken place in pond? Name such condition.
(b) What measure will you take to stop villagers for such practices as well as to improve the condition?

A) Eutrophication – Brief explanation.
B) Any two means of spreading awareness of disposal of waste and keeping the pond clean.

Values
• Service to society
• Concern about environment.

Chapter 01 Reproduction in Organisms
CBSE Class 12 Biology Reproduction in Organisms VBQs
Chapter 02 Sexual Reproduction In Flowering Plants
CBSE Class 12 Biology Sexual Reproduction In Flowering Plants VBQs
Chapter 03 Human Reproduction
CBSE Class 12 Biology Human Reproduction VBQs
Chapter 04 Reproductive Health
CBSE Class 12 Biology Reproductive Health VBQs
Chapter 05 Principles of Inheritance and Variation
CBSE Class 12 Biology Principles of Inheritance and Variation VBQs
Chapter 06 Molecular Basis of Inheritance
CBSE Class 12 Biology Molecular Basis of Inheritance VBQs
Chapter 08 Human Health and Diseases
CBSE Class 12 Biology Human Health and Diseases VBQs
Chapter 09 Strategies for Enhancement in Food Production
CBSE Class 12 Biology Strategies for Enhancement in Food Production VBQs
Chapter 10 Microbes in Human Welfare
CBSE Class 12 Biology Microbes in Human Welfare VBQs
Chapter 11 Biotechnology Principles and Processes
CBSE Class 12 Biology Biotechnology Principles and Processes VBQs
Chapter 12 Biotechnology and Its Application
CBSE Class 12 Biology Biotechnology and Its Application VBQs
Chapter 13 Organisms and Populations
CBSE Class 12 Biology Organisms and Populations VBQs

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