CBSE Class 12 Biology Reproduction In Organisms Study Guide

Download CBSE Class 12 Biology Reproduction In Organisms Study Guide in PDF format. All Revision notes for Class 12 Biology have been designed as per the latest syllabus and updated chapters given in your textbook for Biology in Standard 12. Our teachers have designed these concept notes for the benefit of Grade 12 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 12 Biology for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 12 Biology given our website

Reproduction In Organisms Study Guide Class 12 Biology Revision Notes

Class 12 Biology students should refer to the following concepts and notes for Reproduction In Organisms Study Guide in standard 12. These exam notes for Grade 12 Biology will be very useful for upcoming class tests and examinations and help you to score good marks

Reproduction In Organisms Study Guide Notes Class 12 Biology

 

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Definitions:

CLONE :- Offspring from single parent, Morphology and genetically similar individuals.

CYST :- Hard covering around the organism protecting from anti environment.

DIOECIOUS :- It is the condition in which either male or female reproductive organs are found in the same body of an organism.

EMBRYOGENESIS :- It is the process of development of embryo from the zygote..

FERTILIZATION :- The union of two opposite types of gametes, spermatozoa and ova to produce single diploid zygote.

FISSION :- Division of nucleus with cytoplasm.

FRAGMENTATION :- Division of breaking into distinct pieces each of which can produce an offspring.

GEMMULE :- The parent individual releases a specialized mass of cells enclosed in a common opaque envelope called the gemmule.

HERMAPHRODITE :- Organisms which have both male and female reproductive organs in the same individual.

HOMOGAMETES :- When the two gametes of male and female are so similar in appearance that it is not possible to categorize them into male and female gametes.

JUVENILE PHASE :-Juvenile Phase represents the period of an organism from birth upto reaching reproductive maturity.

LIFE SPAN :-The period from birth to the natural birth of an organism.

MEIOCYTE ;- The cell which undergoes meiosis is called a meiocyte .

MONOECIOUS :- It is the condition in which male and female reproductive organs are found in the same body of an organism.

PARTHENOGENESIS :-The female gamete undergoes development to form new organisms without fertilization.

REPRODUCTION :-Biological process in which an organism gives rise to young ones of its own kind.

SYNGAMY :- Syngamy refers to the fusion of two (male and female) gametes.

VEGETATIVE PROPAGATION :-It is the process of formation or regeneration of new plants from a portion of a vegetative part of the plant .

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LEVEL-1

1. What is meiocyte?

2. Name the structure which gets transformed into seeds at maturity.

3. Show diagrammatically only reproduction in yeast.

4. Name two animals having external fertilization. Why are more gametes produced by such animals?

 

LEVEL 2
1. Why are the date palms referred to as dioecious?
2. Name any one animal in which self-fertilization occurs.
3. Differentiate between: External Fertilization / Internal fertilization, Zoospore / zygote, Gametogenesis / Embryogenesis.
4. What is special in flowering bamboo?
5. Write the mode of asexual reproduction in the following organisms: Penicillium, Spongilla, Paramoecium, Yeast, Chlamydomonas, Amoeba.
6. Why are the date palms referred to as dioecious ?
7. What do the following parts in a flower form after fertilization?
a. Zygote,
b. ovule,
c. ovary-wall,
d. Petal

LEVEL 3
1. What are the three major phases in the life cycle of organism? Define each phase
2. Discuss the similarities in pattern of sexual reproduction.
3. Name the kind of reproduction in bees by which drones are produced?
4. If the diploid number of chromosomes in an angiosperm plant is 28, what number would you expect in the endosperm and embryo of that plant?
5. Give the scientific terms for the following
a. Morphologically and genetically similar individual derived through asexual reproduction.
b. Cyclical changes shown by seasonal breeders.
6. What is the site of origin of new plantlets in the followings ?
a) Potato tuber,
b) rhizome of ginger,
c) leaves of bryophyllum,
d) stem cutting of sugar cane

 

7. Label S & P shown in the Figure and state one function each.

CBSE Class 12 Biology - Reproduction In Organisms Study Guide

 

8.Arrange the following events in proper sequence:-
(i) (a) Embryogenesis (b) fertilization (c) Gametogenesis (d) Zygote formation
(ii) Mention two processes taking place in embryogenesis?
(iii) What will happen if meiosis does not take place during gametogenesis?

SELF EVALUATION ASSIGNMENT
1. Single celled organisms are considered immortal. Justify the statement taking the example of amoeba.
2. Which ability of plants like banana and bryophyllum is exploited by gardeners & farmers for theit commercial propagation.
3. All papaya and date palm plants produce flowers yet only few papaya and datepalm are seen to produce fruits. Suggest the possible reason for the rest not producing then.
4. in nature for both plants and animals hormones are responsible for transition between the three phases of their life span. Which three phases are being refer to here. What regulates the reproduction process and the associated behavioral expression in them?
5. Name the process of development of embryo from zygote. What are the two changes which the zygote undergoes during this process.
6. i)Name a group of plants that has haploid body
ii)what are the specialized cells which undergo meiosis in the diploid organisms.
7. (i) In bisexual flowers why is transfer of pollen grains easier than in the unisexual flowers?
(ii) Name the specialized event in unisexual flowers which helps in transfer of pollen.
(iii)How are the non-motile male gametes carried to the female gamete in seed plants?
8. Why Dogs and cats have oestrus cycle but human beings have menstrual cycle, through all are mammals? Why some mammals are called seasonal breeders?
9. Arrange the following events in proper sequence:-
(i) (a) Embryogenesis (b) fertilization (c) Gametogenesis (d) Zygote formation
(ii) Mention two processes taking place in embryogenesis?
(iii) What will happen if meiosis does not take place during gametogenesis?


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