Stamen, microsporangium and pollen grain — practice questions

Question 1 · difficulty L1 · recall

Which part of a typical stamen contains the pollen sacs?

• A. Anther
• B. Filament
• C. Stigma
• D. Style

Question 2 · difficulty L1 · recall

How many microsporangia are typically present in a bilobed angiosperm anther?

• A. Two
• B. Four
• C. Six
• D. Eight

Question 3 · difficulty L2 · understanding

Which wall layer of a microsporangium directly nourishes developing pollen grains?

• A. Endothecium
• B. Epidermis
• C. Tapetum
• D. Middle layers only

Question 4 · difficulty L2 · understanding

Given below are two statements : One is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A) : Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus. Reason (R) : Presence of more than one nucleus in the tapetum increases the efficiency of nourishing the developing microspore mother cells. In light of the above statements, choose the most appropriate answer from the options given below:

• A. A is true but $\mathbf{R}$ is false
• B. $\mathbf{A}$ is false but $\mathbf{R}$ is true
• C. Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$
• D. Both $\mathbf{A}$ and $\mathbf{R}$ are true but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$

Question 5 · difficulty L3 · application

A diploid pollen mother cell undergoes meiosis normally. What is its immediate product?

• A. Four diploid microspores
• B. Two diploid pollen grains
• C. One haploid embryo sac
• D. A tetrad of four haploid microspores

Question 6 · difficulty L3 · application

A mutation prevents the generative cell from dividing after pollen germination, but the pollen tube grows normally. Which event is most directly compromised?

• A. Formation of the pollen tube wall
• B. Formation of the two male gametes needed for double fertilisation
• C. Meiosis of the pollen mother cell
• D. Development of the embryo sac

Question 7 · difficulty L3 · understanding

Arrange the following in the correct developmental sequence related to microsporogenesis : A. Microspore tetrads B. Sporogenous tissue C. Pollen grains D. Pollen mother cells Choose the correct answer from the options given below :

• A. $\mathrm{D}, \mathrm{A}, \mathrm{C}, \mathrm{B}$
• B. $\mathrm{B}, \mathrm{D}, \mathrm{A}, \mathrm{C}$
• C. $\mathrm{B}, \mathrm{D}, \mathrm{C}, \mathrm{A}$
• D. $\mathrm{A}, \mathrm{D}, \mathrm{C}, \mathrm{B}$

Question 8 · difficulty L3 · understanding

Pollen grains remain preserved as fossils due to the presence of :

• A. Epidermal layer
• B. Tapetum
• C. Exine layer
• D. Intine layer

Question 9 · difficulty L3 · understanding

What is the function of tassels in the corn cob?

• A. To trap pollen grains
• B. To disperse pollen grains
• C. To protect seeds
• D. To attract insects

Question 10 · difficulty L3 · understanding

Diadelphous stamens are found in

• A. China rose and citrus
• B. China rose
• C. Citrus
• D. Pea