ASEXUAL REPRODUCTION IN PLANTS
Part-1:
1. Enumerate the functions of reproduction.
2. i) Name the process of development of embryo from the zygote.
(ii) What are the two changes which the zygote undergoes during this process?
Part -2:
1. Can we refer the off -springs formed by asexual reproduction, as a clone? If yes, why?
2. Why oestrous cycle is not seen in humans?
3. Arrange the following events in proper sequence:-
(a) Embryogenesis
(b) Fertilization
(c) Gametogenesis
(d) Zygote formation.
What will happen if meiosis does not take place during gametogenesis?
4. Explain why meiosis and gametogenesis are always interlinked?
Part-3:
1. A plant was introduced in India because of its beautiful flowers & shape of leaves. It propagates vegetatively at a phenomenal rate and spread all over the water bodies and has become a threat. Which plant is being referred to?
2. No two individuals, especially in mammals (except monozygotic twins) look alike. What distinguishes them from the rest?
3. Differentiate between zoospores and aplanospores.
4. The Nilgiris belt form the large blue stretches in the hilly areas of Kerala, Karnataka, & Tamilnadu and attracted a large number of tourists. What reason do you attribute to this phenomenal change of nature once in 12 years?
5. Often the number of male gametes produced in an organism is in large number as compared to female. Why has nature taken up this developmental disparity?
6. In nature for both plants & animals, hormones are responsible for transitions between the three phases of reproduction. Which 3 phases are being referred to here?
7. Though ginger is found under the soil. Yet it is not a root, but stem. Justify your answer with two reasons.
8. In non-primate mammals like cows, sheep, rats, deer etc, the cyclical changes that occur during reproduction are called oestrus cycle whereas in primates it is called as menstrual cycle. How can we distinguish between them?
9. Differentiate between seasonal and continuous breeders.
Part-4:
1. In nature, i.e. in the wild, birds lay eggs seasonally during a particular time of the year, but in the poultry farm, eggs are produced throughout the year.
i) Give reason for the observation.
ii) Is it ethically/morally correct in your opinion? Justify your argument.
Part-5:
1. A few plants exhibit unusual flowering phenomena which flowers once in their life time and die. Suggest an evidence of the same from monocotyledon.
2. All papaya and date palm plants produce flowers yet only few papaya and date palm seen to produce fruit. What could be the possible reason for the rest not producing them?
3. Offspring derived by asexual reproduction are called clones. Justify giving two reasons.