Question 1

What is transpiration in plants and why is it important?

Accepted Answer

Transpiration is the process by which water is absorbed by plant roots from the soil, moves through plants, and evaporates from the leaves into the atmosphere. It is crucial for maintaining the flow of water and nutrients from the roots to the leaves, cooling the plant, and facilitating photosynthesis by opening stomata for gas exchange.

Question 2

How does transpiration occur in plants according to the Edexcel GCSE Combined Science curriculum?

Accepted Answer

Transpiration occurs when water evaporates from the surface of leaf cells and exits through small openings called stomata. This process is driven by the difference in water potential between the moist interior of the leaf and the drier external environment, causing water to move up from the roots through the xylem vessels.

Question 3

What factors affect the rate of transpiration in plants?

Accepted Answer

Several factors influence the rate of transpiration, including temperature, humidity, wind speed, and light intensity. Higher temperatures and wind speeds increase transpiration rates, while high humidity decreases it. Light intensity affects the opening of stomata, thus influencing transpiration.

Question 4

How do plants regulate transpiration to prevent water loss?

Accepted Answer

Plants regulate transpiration by opening and closing their stomata. Guard cells surrounding each stoma control its opening. In conditions of water scarcity, stomata close to conserve water. Additionally, some plants have adaptations like waxy leaf surfaces or reduced leaf area to minimize water loss.

Question 5

What is the role of stomata in the process of transpiration?

Accepted Answer

Stomata are small openings on the surface of leaves that facilitate gas exchange. They play a critical role in transpiration by allowing water vapor to escape from the leaf into the atmosphere. The opening and closing of stomata are regulated by guard cells, which help balance water retention and gas exchange.

Transpiration

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Frequently Asked Questions about Transpiration

What is transpiration in plants and why is it important?

How does transpiration occur in plants according to the Edexcel GCSE Combined Science curriculum?

What factors affect the rate of transpiration in plants?

How do plants regulate transpiration to prevent water loss?

What is the role of stomata in the process of transpiration?