Select all that are true regarding gas exchange in a vascular plant.

*Guard cells regulate whether stomata are open or closed based on availability of water in the plant.

*Plants that live in dry environments have adaptations such as reduced leaves (such as needle-shaped leaves) to reduce water loss as much as possible.

*When stomata are closed, the plant is not able to exchange oxygen and carbon dioxide gas with the atmosphere.

*Oxygen gas from the atmosphere enters leaf stomata, and carbon dioxide gas leaves.

*Stomata are open when a plant is low on water, and closed when a plant has plenty of water.

*Plants close their stomata to reduce water loss.

*Guard cells regulate whether stomata are open or closed based on availability of sugars in the plant.

*Transpiration is loss of water vapor from leaves.

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*Transpiration is loss of water vapor from leaves.

Guard cells regulate whether stomata are open or closed based on availability of water in the plant.

Plants that live in dry environments have adaptations such as reduced leaves (such as needle-shaped leaves) to reduce water loss as much as possible.

When stomata are closed, the plant is not able to exchange oxygen and carbon dioxide gas with the atmosphere

.Oxygen gas from the atmosphere enters leaf stomata, and carbon dioxide gas leaves.Plants close their stomata to reduce water loss.

Transpiration is loss of water vapor from leaves.

The above factors are mechanism of respiration for regulation of water vapour contents of the plants, In order to control the mechanisms of respiration, the stomata opening and closing control by the guard cells is important.

Generally the fluctuation of water in the epidermal cells of the guard cells control the stoma. However,sugar  control the closure of guard cells. Generally conservation of water vapour is important to plant survival.

Explanation:

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.