Stamen, Microsporangium and Pollen Grain
Stamen, Microsporangium and Pollen Grain: Overview
This topic covers concepts, such as, Anther, Microsporangium, Middle Layer of Microsporangium & Filament of Stamen etc.
Important Questions on Stamen, Microsporangium and Pollen Grain
Match the following:
| Column-I | Column-II | ||
| (a) | Coleorhiza | (i) | Birth cord |
| (b) | Umbilical cord | (ii) | The outer wall of a spore or pollen grain |
| (c) | Germ pores | (iii) | A sheath protecting the root of a germinating grass or cereal grain |
The process of development of pollen mother cell into a mature pollen grain includes:
Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of
Assertion : If pollen mother cells has 42 chromosomes, the pollen has only 21 chromosomes.
Reason : Pollens are formed after meiosis in pollen mother cell.
Find the odd one out.
Male gametophyte of angiosperms/ monocots is
What are the labels A and B indicate in the given picture of a pollen grain?
During pollen germination, intine forms a pollen tube and extrudes out through the germ pore.
Draw the structure of a pollen grain and label the inner layer of the wall of it.
The inner layer of wall surrounding the pollen and spore that protects the reproductive cells is known as _____ (intine/exine).
Exine of pollen helps attachment to _____ (pollinators/stem).
Which of the following feature/s is/are correct about the outermost layer covering the pollen grains?
What is exine? Write two functions of it?
The wall of pollen has an inner layer named intine, and the outer layer is exine.
In the given picture, identify which option indicates outermost coating of a pollen grain:
Liquid nitrogen has a boiling point of -196C that is used as medicine in the removal of precancerous cells, warts, or unwanted skin, and as cryogenics by the researchers.
Write two important aspects of the creation of the pollen bank.
To store the pollen grains of the desired species as their genetic resources, pollen banks are established. These pollens from the pollen banks are used for _____ (breeding program/pollution control)
Mention two uses of pollen grains that make it economically important.
Pollen grains are used as tablets and syrup because of their _____ (nutritional value/not easily disintegrated).
