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Question
The above is the diagram of the Transverse section of the anther.
Identify the parts labeled as A, B, and C.
The above is the diagram of the Transverse section of the anther.
Identify the parts labeled as A, B, and C.
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Solution
The correct option is A A- Connective tissue, B- Pollen grain, C- Stomium
The T. S. shows a dithecous tetrasporangiate anther wherein each anther lobe has two long microsporangia which are separated from each other by shallow groove on the outside, called as stomium. Stomium (C) serves as line of dehiscence and have thin walled hypoerdermal cells. The middle parenchymatous tissue that joins two anther lobes together is termed as connective tissue (A). Each microsporangium has two parts, the outer wall and inner homogenous sporogenous tissue. The wall has four types of layers namely epidermis, endothecium, 1-3 middle layers and tapetum. Endothecium consists of larger cells and develops thickening of cellulose on inner and radial walls during differentiation which makes options B and D incorrect as endothecium is the layer in sporangial wall. The inner sporogenous tissue of each microsporangium differentiates into microspore/pollen mother cell and undergoes microsporogenesis to produce microspores/pollen grains (B) that remain suspended in central of each microsporangium. Thus, the correct answer is option A.
The T. S. shows a dithecous tetrasporangiate anther wherein each anther lobe has two long microsporangia which are separated from each other by shallow groove on the outside, called as stomium. Stomium (C) serves as line of dehiscence and have thin walled hypoerdermal cells. The middle parenchymatous tissue that joins two anther lobes together is termed as connective tissue (A). Each microsporangium has two parts, the outer wall and inner homogenous sporogenous tissue. The wall has four types of layers namely epidermis, endothecium, 1-3 middle layers and tapetum. Endothecium consists of larger cells and develops thickening of cellulose on inner and radial walls during differentiation which makes options B and D incorrect as endothecium is the layer in sporangial wall. The inner sporogenous tissue of each microsporangium differentiates into microspore/pollen mother cell and undergoes microsporogenesis to produce microspores/pollen grains (B) that remain suspended in central of each microsporangium.
Thus, the correct answer is option A.
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