Question

Based on the given excerpt, answer the given question.

Stamen is regarded as a microsporophyll that possesses microsporangia which have microspore mother cells that give rise to microspores. The cells of sporogenous tissues undergo meiotic division to form microspore tetrad. Microspore is present in the bilobed structure called anther. A male gametophyte is a gamete producing haploid phase in a plant. In angiosperms, it is the pollen grains that are regarded as gametophytes.

Match the labels with their correct description in the given diagram of microsporangium showing different layers of its wall.
[1 mark]

• A. $\begin{array}{ccc}\text{Label}& \text{Name}& \text{Description}\\ \text{P}& \text{Epidermis}& \text{Outermost, protective}\\ \text{Q}& \text{Endothecium}& \text{Innermost wall layer}\\ \text{R}& \text{Microspore mother cells}& \text{Forms microsporess}\\ \text{S}& \text{Middle layers}& \text{Help in dehiscence of anther}\\ \text{T}& \text{Tapetum}& \text{Nourishes the developing pollen grains}\end{array}$
• B. $\begin{array}{ccc}\text{Label}& \text{Name}& \text{Description}\\ \text{P}& \text{Epidermis}& \text{Outermost, protective}\\ \text{Q}& \text{Endothecium}& \text{Protective layer}\\ \text{R}& \text{Middle layers}& \text{Help in dehiscence of anther}\\ \text{S}& \text{Microspore mother cells}& \text{Forms microspore}\\ \text{T}& \text{Tapetum}& \text{Innermost layer of the wall}\end{array}$
• C. $\begin{array}{ccc}\text{Label}& \text{Name}& \text{Description}\\ \text{P}& \text{Epidermis}& \text{Outermost, protective}\\ \text{Q}& \text{Tapetum}& \text{Nourishes the pollen grains}\\ \text{R}& \text{Middle layers}& \text{Help in dehiscence of anther}\\ \text{S}& \text{Microspore mother cells}& \text{Forms microspore}\\ \text{T}& \text{Endothecium}& \text{Innermost layer of the wall}\end{array}$
• D. $\begin{array}{ccc}\text{Label}& \text{Name}& \text{Description}\\ \text{P}& \text{Epidermis}& \text{Outermost, protective}\\ \text{Q}& \text{Tapetum}& \text{Nourishes the pollen grains}\\ \text{R}& \text{Endothecium}& \text{Help in dehiscence of anther}\\ \text{S}& \text{Microspore mother cells}& \text{Forms microspore}\\ \text{T}& \text{Middle layer}& \text{Innermost layer of the wall}\end{array}$

Answer 1

The correct option is B $\begin{array}{ccc}\text{Label}& \text{Name}& \text{Description}\\ \text{P}& \text{Epidermis}& \text{Outermost, protective}\\ \text{Q}& \text{Endothecium}& \text{Protective layer}\\ \text{R}& \text{Middle layers}& \text{Help in dehiscence of anther}\\ \text{S}& \text{Microspore mother cells}& \text{Forms microspore}\\ \text{T}& \text{Tapetum}& \text{Innermost layer of the wall}\end{array}$

Microsporangia are sac-like structures present in anther of angiosperms. It has several wall layers as depicted in the diagram:

Label	Name	Description
P	Epidermis	Outermost, protective layer
Q	Endothecium	Protective layer
R	Middle layers	Help in dehiscence of anther
S	Microspore mother cells	Forms microspore
T	Tapetum	Innermost layer of the wall