Plant structures and their functions：練習題

The diagram represents the movement of sucrose through a plant. Which statement correctly explains the mechanism of translocation in the phloem?

Root hair cells are adapted for the absorption of water and mineral ions. Which of the following best describes the transport mechanisms involved?

Xylem vessels are highly adapted for the transport of water and mineral ions. Which structural feature is essential for supporting the tension created by the transpiration pull?

A student uses the inverse square law to calculate the light intensity reaching a plant. If the distance between the light source and the plant is tripled, what is the new light intensity compared to the original intensity (\(I\))?

In an investigation into transpiration, a potometer is used to measure the rate of water uptake. If the distance moved by a bubble in 10 minutes is 15 mm and the capillary tube has a cross-sectional area of \(0.8\text{ mm}^2\), what is the rate of transpiration in \(\text{mm}^3/\text{min}\)?

Using the inverse square law, calculate the change in the relative rate of photosynthesis if a light source is moved from a distance of \(10\text{ cm}\) to a distance of \(40\text{ cm}\) from a plant.

Explain how the structures of the xylem and phloem are specifically adapted to their respective roles in the transport of materials through a plant.

A plant is placed in a environment where light intensity is varied by changing the distance of the light source.
(a) Use the inverse square law to calculate the relative light intensity if the distance from the lamp is doubled.
(b) Describe how the structure of the xylem and phloem are adapted to transport substances around the plant, specifically mentioning lignification and the use of energy.