5. In the following sketch of the stomatal apparatus the parts 1.11.III.IV were labelled differently by
four students:
(D
(11)
(III)
(V)
The correct labelling out of the following is:
a) (Iguard cell (ll)stoma (III) starch granule (IV)nucleus
b) (cytoplasm, (II) nucleus (III) stoma (IV)chloroplast
c) (Iguard cell, (II) starch granule (III) nucleus (IV)stoma
d) (U)cytoplasm, (II) chloroplast (II) stoma (IV) nucleus.
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Answer:
Cytoplasm, II. Nucleus, III. Stoma, IV. Chloroplast
Stomata are small pores present in the epidermis of leaves. They regulate the process of transpiration and gaseous exchange. The stomatal pore is enclosed between two bean-shaped guard cells. The inner walls of guard cells are thick, while the outer walls are thin. The guard cells are surrounded by subsidiary cells. These are the specialized epidermal cells present around the guard cells. The pores, the guard cells and the subsidiary cells together constitute the stomatal apparatus.
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