Pollen grains of many plants are found to be allergic.
Do they have any benefits other than the involvement in reproduction. Explain.

Pollen grains in angiosperms are not motile. They have to be carried to the stigma by external agents. Explain how it takes place in vallisnaria.

Read the following statements carefully and select the appropriate option given below. (i) Bisexual animals that possess both male and female reproductive organs, are hermaphrodites. (ii) In seed plants, pollen grains are the carriers of male gametes and ovule have the egg. (iii) Events in sexual reproduction before the formation of zygote are called post-fertilisation events. (iv) Sexual reproduction involves the formation and fusion of gametes, (v) Animals are categorised into oviparous and viviparous based on whether the development of the zygote takes place outside the body of the female parent or inside.

An anther produces 1600 pollen grains. How many pollen mother cells must have been there to produce?

Assertion, Geitonogamy is functionally cross-pollination involving pollinating agent and genetically it is similar to autogamy since the pollen grains come from the another plant. Reason: Geitonogamy is the only type of pollination which during pollination brings genetically different types of pollen grains to the stigma.

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