What could be the two most likely reasons for unicellular organisms to reproduce only through asexual reproduction?
Important Questions on How do Organisms Reproduce?
The diagram shows the cross-section through the carpel of a flower just before fertilisation.
Where will the male and female gametes be just before fertilisation?
| Male gamete | Female gamete | |
| (a) | 1 | 5 |
| (b) | 1 | 4 |
| (c) | 2 | 4 |
| (d) | 3 | 5 |
The two glands A and B which occur in pairs are present in the endocrine system of humans. The pair of glands A is found only in females whereas the pair of glands B occurs only in males. The glands A make and secrete two hormones C and D whereas glands B make and secrete only one hormone E. In addition to hormones, glands A make gametes F whereas glands B make gametes G.
What are gametes (i) F, and (ii) G?
The factors responsible for the rapid spreading of bread mould on slices of bread are
(i) presence of a large number of spores in air.
(ii) presence of a large number of thread-like branched hyphae.
(iii) presence of moisture and nutrients.
(iv) formation of round shaped sporangia.
Consider the following three flowers namely X, Y and Z. Which flower(s) would develop into a fruit?
The diagram shown below depicts pollination. Choose the options that will show a maximum variation in the offspring.
