Q1 of 49 Page 6

In haploid organisms that undergo sexual reproduction, name the stage in the life cycle when meiosis occurs. Give reasons for your answer.

Haploid organisms are those which have half the number of chromosomes than their parents. These organisms do not undergo meiosis, as only diploid cells undergo meiosis. These haploid cells only show meiotic division when the formation of zygote takes place as the zygote is the only diploid cell in their life cycle.


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14

Match the organisms given in Column-’A’ with the vegetative propagules given in column ‘B’.

Col. A Col. B


i. Bryophyllum a) offset


ii. Agave b) eyes


iii. Potato c) leaf buds


iv. Water hyacinth d) bulbils


 15

What do the following parts of a flower develop into after fertilisation?

a. Ovary ______________


b. Ovules ______________


 2

The number of taxa exhibiting asexual reproduction is drastically reduced in higher plants (angiosperms) and higher animals (vertebrates) as compared with lower groups of plants and animals. Analyse the possible reasons for this situation.

 3

Honeybees produce their young ones only by sexual reproduction. In spite of this, in a colony of bees we find both haploid and diploid individuals. Name the haploid and diploid individuals in the colony and analyse the reasons behind their formation.