CBSE Class 12 Biology Reproduction In Organisms Assignment Set A

CBSE Class 12 Biology Reproduction In Organisms Assignment Set A . Based on CBSE and NCERT guidelines. The students should read these basic concepts to gain perfection which will help him to get more marks in CBSE examination.

Important Questions for NCERT Class 12 Biology Reproduction in Organisms

Question. Syngamy may occur in ………… .
(a) external medium
(b) internal medium
(c) Both (a) and (b)
(d) None of these
Answer : C

Question. ‘Organisms exhibiting external fertilisation release a large number of gametes’. Why?
(a) These organisms shows great synchrony between the sexes
(b) In order to enhance the chances of syngamy
(c) To produce large number of offsprings as they are vulnerable to predators
(d) All of the above
Answer : D

Question. Internal fertilisation is the one in which syngamy
(a) occur outside the body
(b) occur inside the body
(c) is followed by meiosis
(d) None of the above
Answer : B

Question. Diploid zygote is universal in
(a) All sexually reproducing organisms
(b) All asexually reproducing organisms
(c) All sexually and asexually reproducing organisms
(d) Only plants and animals
Answer : A

Question. Life begins in all sexually reproducing organism from a
(a) single-celled zygote
(b) double-celled zygote
(c) thick-walled zygote
(d) All of these
Answer : A

Question. Embryogenesis involves
(a) formation of embryo from zygote
(b) cell division via meiosis and differentiation
(c) Both (a) and (b)
(d) None of the above
Answer : A

Question. Choose the incorrect pair.
(a) Cell division in embryo – Increase the number of cells
(b) Cell differentiation – Form specialised tissues and organs
(c) Eggs covered by hard calcareous shell – Oviparous animals
(d) Zygote develops outside the body –Viviparous animals
Answer : D

Question. Chances of survival of young ones are more in the case of............. individuals.
(a) oviparous
(b) viviparous
(c) ovoviviparous
(d) None of these
Answer : B

Question. Offsprings of oviparous animals have less chances of survival as compared to those of viviparous animals because
(a) proper embryonic care and protection is absent
(b) embryo does not develop completely
(c) progenies are of smaller size
(d) genetic variations do not occur
Answer : A

Question. What does ‘P’ signifies in the diagram given below?

Answer : B 

Statement Based Questions

Question. Which one of the following statement regarding post-fertilisation development in flowering plants is incorrect? NEET 2019
(a) Zygote develops into embryo
(b) Central cell develops into endosperm
(c) Ovules develop into embryo sac
(d) Ovary develops into fruit
Answer : C

Question. Choose the incorrect statement about gemmules.
(a) They resist dessication 
(b) They are internal buds
(c) They are asexual structure which are produce by binary fission
(d) They can give rise to new organisms
Answer : C

Question. Which of the following statements is correct?
(a) All the individuals of a species have exactly the same lifespan
(b) Smaller organisms always have shorter lifespan and vice-versa
(c) Lifespan of an organism is the time period from its birth to its natural death
(d) No organism may have a lifespan of several hundred years
Answer : C

Question. Which one of the following statements is incorrect?
(a) Offspring produced by the asexual reproduction are called clone
(b) Microscopic motile asexual reproductive structures are called zoospores
(c) In potato, banana and ginger, the plantlets arise from the internodes present in the modified stem
(d) Water hyacinth, growing in the standing water, drains oxygen from water that leads to the death of fishes
Answer : C

Question. Mark the incorrect statement.
(a) Perennial species shows clear cut vegetative,reproductive and senescent phases
(b) End of vegetative phase mark the beginning of reproductive phase
(c) Bamboo species flower only once in their lifetime
(d) The reproductive phase is of variable duration in different organisms
Answer : A

Question. Choose the incorrect statement for events in sexual reproduction.
(a) All sexually reproducing organisms exhibits events and processess having fundamental similarity
(b) Structures associated with sexual reproduction vary among different groups of organisms
(c) Pre-fertilisation, fertilisation and post-fertilisation is the exact sequence of events occurring in sexual reproduction
(d) None of the above
Answer : D

Question. Which one of the following statements is incorrect?
(a) Gamete receive only one set of chromosomes
(b) Meiosis is a reductional division occurring in both haploid and diploid organisms
(c) Male gametes are always produced in less quantity than female gametes
(d) In seed plants, pollen grains are the carriers of male gametes
Answer : C

Question. Go through the following statements.
I. Cell division is a mode of reproduction in algae and fungi.
II. Amoeba and Paramecium divide by fragmentation.
III. In yeast, cell division is unequal and small buds are produced.
IV. Zoospores are macroscopic non-motile structures.
Choose the incorrect statements.
(a) I and III
(b) III and IV
(c) I, II and IV
(d) Only III
Answer : C

Question. Read the following statements about asexual reproduction and select the correct ones.
I. It involves a single parent.
II. It is slower than sexual reproduction.
III. It produces progeny that are genetically identical with the parent, but not with one another.
IV. The progeny of asexual reproduction can be termed as clones.
(a) I and II
(b) II and III
(c) I and IV
(d) I, III and IV
Answer : C

Question. Read the following statements and select the correct ones.
I. Conidia are the asexual propagules restricted to kingdom–Fungi.
II. Apiece of potato tuber having at least one eye (or node) is capable of giving rise to a new plant.
III. Ginger propagates vegetatively with the help of its underground roots.
IV. Fleshy buds which take part in vegetative propagation are called bulbils, present in Dioscorea, Agave, etc.
(a) II and III
(b) I and IV
(c) I, II and IV
(d) I, II and III
Answer : C

Question. Find out the incorrect statement.
I. Lifespans of organisms are necessarily correlated with their sizes.
II. The sizes of crows and parrots are not very different, but still their lifespans vary extremely.
III. Apeepal tree has much shorter lifespan as compared to a mango tree.
IV. Reproduction is essential for continuity of species on the earth.
(a) I and III
(b) I, II and III
(c) Only IV
(d) II and III
Answer : A

Question. Consider the following statements.
I. Many plants propagate vegetatively even though they bear seeds.
II. Sweet potatoes multiply vegetatively by root tubers.
Select the correct option.
(a) I is true, but II is false
(b) Both I and II are false
(c) I is false, but II is true
(d) Both I and II are true
Answer : D

Question. Read the following statements.
I. Organisms exhibiting external fertilisation show great synchrony between the sexes and release a large number of gametes.
II. Amajor disadvantage of external fertilisation is that the offspring are extremely vulnerable to predators.
III. In gymnosperms, male gametes reach egg with the help of water as a medium.
IV. Zygote is a vital link that ensures continuity of species between organisms of one generation and the next.
V. Every sexually reproducing organisms begin their life as a single-celled zygote.
Which of the above statements are correct?
(a) I, II and III
(b) I, II, III and V
(c) I, II, IV and V
(d) I, II, III and IV
Answer : C

Question. Read the following statements.
I. Eichhornia contributes extra oxygen to the water bodies which reduces the mortality of fishes.
II. Zingiber propagates vegetatively by tap roots.
III. Fleshy buds which take part in vegetative propagation are called bulbils, e.g. Agave.
IV. Apotato tuber having atleast one eye, i.e. axillary bud can form a new plant.
V. Bryophyllum posssesss leaf buds.
Which of the above statements is/are correct?
(a) I, II and III
(b) III, IV and V
(c) I, II and V
(d) I, II, III, IV and V
Answer : B

Question. Read the following statements.
I. The vegetative phase is of same duration in different organisms.
II. Clear-cut vegetative, reproductive and senescent phases can be observed in monocarpic plants.
III. Bambusa differs from Strobilanthes kunthiana (Neelakurinji) in the length of juvenile phase and being monocarpic.
IV. The end of juvenile/vegetative phase in angiosperms is seen when they come to flower.
V. Sexual mode of reproduction is present in most animals.
Which of the above statement is/are incorrect?
(a) II, IV and V
(b) II and III
(c) III, IV and V
(d) I and III
Answer : D

Question. Read the following statements.
I. Interaction between hormones and certain environmental factors regulate the reproductive processes and the associated behavioural expression of organisms.
II. In animals, but not in plants, hormones are responsible for the transitions between juvenile, reproductive and senescent phases.
III. After attainment of maturity, all sexually reproducing organisms exhibit events and processes that have remarkable fundamental similarity, though the structure associated with sexual reproduction are indeed very different.
IV. The post-fertilisation events include gametogenesis and gamete transfer.
V. In majority of the sexually reproducing organisms, the gametes produced are morphologically distinct types, i.e. heterogametes.
Which of the above statements are correct?
(a) I, III and V
(b) I, II and IV
(c) III, IV and V
(d) II, III and V
Answer : A

Question. A few statements with regard to sexual reproduction are given below.
I. Sexual reproduction does not always require two individuals.
II. Sexual reproductiongenerallyinvolvesgametic fusion.
III. Meiosis never occurs during sexual reproduction.
IV. External fertilisation is a rule during sexual reproduction.
Choose the correct statements from the options given below.
(a) I and IV
(b) I and II
(c) II and III
(d) II and IV
Answer : B

Question. The term ‘clone’ cannot be applied to offspring formed by sexual reproduction because
(a) offspring do not possess exact copies of parental DNA
(b) DNA of only one parent is copied and passed on to the offspring
(c) offspring are formed at different times
(d) DNA of parent and offspring are completely different
Answer : A

Question. The male gametes of rice plant have 12 chromosomes in their nucleus. The chromosome number in the female gamete, zygote and the cells of the seedling will be, respectively
(a) 12, 24, 12
(b) 24, 12, 12
(c) 12, 24, 24
(d) 24, 12, 24
Answer : C

Question. Amoeba and yeast reproduce asexually by fission and budding, respectively because they are
(a) microscopic organisms
(b) heterotrophic organisms
(c) unicellular organisms
(d) uninucleate organisms
Answer : C

Question. Appearance of vegetative propagules from the nodes of plants such as sugarcane and ginger is mainly because
(a) nodes are shorter than internodes
(b) nodes have meristematic cells
(c) nodes are located near the soil
(d) nodes have non-photosynthetic cells
Answer : B

Question. Choose the correct statement from amongst the following.
(a) Dioecious organisms are seen only in animals
(b) Dioecious organisms are seen only in plants
(c) Dioecious organisms are seen in both plants and animals
(d) Dioecious organisms are seen only in vertebrates
Answer : C

Question. There are various types of reproduction. The type of reproduction adopted by an organism depends on
(a) the habitat and morphology of the organism
(b) morphology of the organism
(c) morphology and physiology of the organism
(d) the organism’s habitat, physiology and genetic makeup
Answer : D

Question. Which of the following is a post-fertilisation event in flowering plants?
(a) Transfer of pollen grains
(b) Embryo development
(c) Formation of flower
(d) Formation of pollen grains
Answer : B

Question. A few statements describing certain features of reproduction are given below.
I. Gametic fusion takes place.
II. Transfer of genetic material takes place.
III. Reduction division takes place.
IV. Progeny have some resemblance with parents.
Select the options that are true for both asexual and sexual reproduction from the options given below.
(a) I and II
(b) II and III
(c) II and IV
(d) I and III
Answer : C

Question. Asexual method of reproduction by binary fission is common to which of the following?
I. Someeukaryotes
II. All eukaryotes
III. Someprokaryotes
IV. All prokaryotes
(a) I and II
(b) II and III
(c) I and III
(d) III and IV
Answer : C

Question. A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of
this alga has
(a) haploid vegetative cells and diploid gametangia
(b) diploid vegetative cells and diploid gametangia
(c) diploid vegetative cells and haploid gametangia
(d) haploid vegetative cells and haploid gametangia
Answer : D

Question. Given below are a few statements related to external fertilisation. Choose the correct statements.
I. The male and female gametes are formed and released simultaneously.
II. Only a few gametes are released into the medium.
III. Water is the mediumin a majority of organisms exhibiting external fertilisation.
IV. Offspring formed as a result of external fertilisation have better chance of survival than those formed inside an organism.
(a) III and IV
(b) I and III
(c) II and IV
(d) I and IV
Answer : B

Question. The statements given below describe certain features that are observed in the pistil of flowers.
I. Pistilmayhave manycarpels.
II. Each carpel mayhave more than one ovule.
III. Each carpel has only one ovule.
IV. Pistil have only one carpel.
Choose the statements that are true from the options given below.
(a) I and II
(b) I and III
(c) II and IV
(d) III and IV
Answer : A

Matching Type Questions

Question. Match the following columns.
Column I                                         Column II
(Asexual reproduction types)             (Examples)
A. Binary fission                               1. Algae
B. Zoospore                                     2. Amoeba
C. Conidium                                    3. Hydra
D. Budding                                      4. Penicillium
E. Gemmules                                   5. Sponge
Codes
     A B C D E
(a) 1 4 5 3 2
(b) 2 1 4 3 5
(c) 1 2 3 4 5
(d) 1 4 3 2 5
Answer : B

Question. Match the following columns.
Column I                       Column II
(Terms)                      (Examples)
A. Monoecious             1. Cladophora
B. Dioecious               2. Fucus
C. Isogametes            3. Coconut
D. Heterogametes       4. Papaya
Codes
     A B C D
(a) 4 3 1 2
(b) 1 3 2 4
(c) 3 4 1 2
(d) 3 4 2 1
Answer : C

Question. Match the following columns.
Column I                               Column II
A. External fertilisation          1. Human beings
B. Internal fertilisation          2. Algae and fishes
C. Ovipary                           3. Bryophytes,
pteridophytes and birds
D. Vivipary                          4 Reptiles and birds
Codes
     A B C D 
(a) 4 1 2 3
(b) 3 1 4 2
(c) 2 3 4 1
(d) 4 2 1 3
Answer : C

Question. Match the following columns.
Column I                                Column II
A. Oestrus cycle                     1. Spirogyra
B. Conjugation                       2. Rose
C. Stem cuttings                    3. Monkey, apes, humans
D. Menstrual cycle                  4. Cows, sheeps, rats
Codes
    A B C D
(a) 1 3 2 4
(b) 4 1 2 3
(c) 4 1 3 2
(d) 2 1 4 3
Answer : B

QUESTION

1. Offsprings produced by asexual reproduction are referred to as clones. Why?

2. Name the most invasive aquatic plant weed which is called as 'Terror of Bengal'.

3. How does Zygote usually differ from Zoospore in terms of ploidy?

4. Mention the main difference between the offspring produced by asexual reproduction and progeny produced by sexual reproduction.

5. Which characteristic property of Bryophyllum is exploited by gardeners and farmers?

6. Higher organism have resorted to sexual reproduction inspite of its complexity. Why?

7. Tapeworms posses both male and female reproductive organs. What is the name given to such organism? Give two more examples of such organisms.

8. Bryophytes and Pteridophytes produce a large number of male gametes but relatively very few female gametes. Why?

9. Mention the site of zygote formation in the ovule of a flowering plant. What happens to sepals, petals and stamens after fertilisation? State the fate of zygote, ovule and ovary in these plants.

Please refer to attached file for CBSE Class 12 Biology Reproduction In Organisms Assignment Set A