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Given below is the diagram of a stomatal apparatus. In which of the following are all the four parts labelled as A, B, C and D correctly identified?
A
A – Subsidiary cell, B – Epidermal cell, C – Guard cell, D – Stomatal aperture
B
A – Guard cell, B – Stomatal aperture, C – Subsidiary cell, D – Epidermal cell
C
A – Epidermal cell, B – Guard cell, C – Stomatal aperture, D – Subsidiary cell
D
A – Epidermal cell, B – Subsidiary cell, C – Stomatal aperture, D – Guard cell
Detailed Solution
The stomatal apparatus consists of the stomatal aperture, the two guard cells and the surrounding subsidiary cells.
C is the pore in the centre: the stomatal aperture.
D is one of the two bean-shaped cells that enclose the pore and contain chloroplasts: the guard cell.
B is one of the specialised epidermal cells lying next to the guard cells: the subsidiary cell.
A is an ordinary cell of the epidermis outside the apparatus: the epidermal cell.
Hence A – epidermal cell, B – subsidiary cell, C – stomatal aperture, D – guard cell.
C is the pore in the centre: the stomatal aperture.
D is one of the two bean-shaped cells that enclose the pore and contain chloroplasts: the guard cell.
B is one of the specialised epidermal cells lying next to the guard cells: the subsidiary cell.
A is an ordinary cell of the epidermis outside the apparatus: the epidermal cell.
Hence A – epidermal cell, B – subsidiary cell, C – stomatal aperture, D – guard cell.