In land plants, the guard cells differ from other epidermal cells in having
cytoskeleton
mitochondria
endoplasmic reticulum
Chloroplasts
Cork cambium -
Cork cambium or extrastelar cambium or phellogen arises from the hypodermis or from the outer layer of cortex. Cork cambium divides periclinically(divides both outer and inner side). The outer side cells become dead and known as cork or phellem. The inner side cells are differentiated into parenolyma and contain chloroplasts. These cells are called secondary cortex or phelloderm.
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The guard cells of stomata in land plants are specialised epidermal cells which contain chloroplasts. In rest of epidermal cells, chloroplasts are absent. But chloroplasts of guard cells are capable of poor photosynthesis as there is the absence of NADP reductase enzyme.
Option 1)
cytoskeleton
This solution is incorrect
Option 2)
mitochondria
This solution is incorrect
Option 3)
endoplasmic reticulum
This solution is incorrect
Option 4)
Chloroplasts
This solution is correct