Question

Given below is a diagram of the stomatal apparatus. Match the labels with the corresponding names of the compounds.

Choose the correct combination.

• A. 1. Stomatal pore; 2. Guard cell; 3. Epidermal cell; 4. Subsidiary cell;
• B. 1. Guard cell; 2. Stomatal pore; 3. Subsidiary cell ; 4. Epidermal cell
• C. 1. Subsidiary cell; 2. Guard cell; 3. Stomatal pore; 4. Epidermal cell
• D. 1.Guard cell; 2. Stomatal pore; 3. Epidermal cell; 4. Subsidiary cell

Answer 1

Answer: (B)

1. Guard cell Stomatal guard cells control the pore to balance $CO_2$ entry into the leaf for photosynthesis with water loss through transpiration. It also regulates membrane transport, signalling and homeostasis.
2. Stomatal pore It allows $CO_2$ to diffuse into leaf for photosynthesis.
3. Subsidiary cell These are accessory cells to guard cells. They play an important role in ion-channel mediated opening and closing of guard cells.
4. Epidermal cell Provides protection to the plants from the external environment.