NCERT Solutions for Class 12 Biology Chapter 1

Reproduction in Organisms Class 12

Chapter 1 Reproduction in Organisms Exercise Solutions

Next Chapter 2 : Sexual Reproduction in Flowering Plants >>

Exercise : Solutions of Questions on Page Number : 17

Q1 :  

Why is reproduction essential for organisms?


Answer :

Reproduction is a fundamental feature of all living organisms. It is a biological process through which living organisms produce offspring's similar to them. Reproduction ensures the continuance of various species on the Earth. In the absence of reproduction, the species will not be able to exist for a long time and may soon get extinct.

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Q2 :  

Which is a better mode of reproduction sexual or asexual? Why?


Answer :

Sexual reproduction is a better mode of reproduction. It allows the formation of new variants by the combination of the DNA from two different individuals, typically one of each sex. It involves the fusion of the male and the female gamete to produce variants, which are not identical to their parents and to themselves. This variation allows the individual to adapt to constantly changing and challenging environments. Also, it leads to the evolution of better suited organisms which ensures greater survival of a species. On the contrary, asexual reproduction allows very little or no variation at all. As a result, the individuals produced are exact copies of their parents and themselves.

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Q3 :  

Why is the offspring formed by asexual reproduction referred to as clone?


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Q4 :  

Offspring formed due to sexual reproduction have better chances of survival. Why? Is this statement always true?


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Q5 :  

How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?


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Q6 :  

Distinguish between asexual and sexual reproduction. Why is vegetative reproduction also considered as a type of asexual reproduction?


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Q7 :  

What is vegetative propagation? Give two suitable examples.


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Q8 :  

Define

(a) Juvenile phase,

(b) Reproductive phase,

(c) Senescent phase.


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Q9 :  

Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?


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Q10 :  

Explain why meiosis and gametogenesis are always interlinked?


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Q11 :  

Identify each part in a flowering plant and write whether it is haploid (n) or diploid (2n).

(a) Ovary ———————————

(b) Anther ———————————

(c) Egg ———————————

(d) Pollen ———————————

(e) Male gamete ———————————

(f ) Zygote ———————————


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Q12 :  

Define external fertilization. Mention its disadvantages.


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Q13 :  

Differentiate between a zoospore and a zygote.


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Q14 :  

Differentiate between gametogenesis from embryogenesis.


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Q15 :  

Describe the post-fertilization changes in a flower.


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Q16 :  

What is a bisexual flower? Collect five bisexual flowers from your neighborhood and with the help of your teacher find out their common and scientific names.


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Q17 :  

Examine a few flowers of any cucurbit plant and try to identify the staminate and pistillate flowers. Do you know any other plant that bears unisexual flowers?


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Q18 :  

Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?


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Next Chapter 2 : Sexual Reproduction in Flowering Plants >>

Biology : CBSE NCERT Exercise Solutions for Class 12th for Reproduction in Organisms will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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