Chapter 11 test

The leafy shoot is cut and connected to the apparatus under water because this can

(1) allow water to enter the xylem vessels more easily.

(2) prevent air from entering the xylem vessels.

(3) prevent plasmolysis of the cells of xylem.

• (1) only

• (2) only

• (1) and (3) only

• (2) and (3) only

Which of the following correctly shows how the distance travelled by the air bubble changes when apparatus P and Q are moved from a well-lit place to a dark environment?

• A

• B

• C

• D

The graph shows the rates of transpiration and water absorption of a plant for 24 hours.

The increase in transpiration rate from 0600 to 1300 was probably due to

• an increase in the rate of photosynthesis.

• an increase in the rate of water absorption.

• an increase in air temperature.

• an increase in the rate of respiration.

The graph shows the rates of transpiration and water absorption of a plant for 24 hours.

At what time does the plant show the sign of wilting?

• 0600

• 1200

• 1500

• 1800

Which of the following combinations of environmental conditions would most likely increase the transpiration rate?

• A

• B

• C

• D

Which of the following features allow terrestrial plants to reduce loss of water?

(1) The leaves are broad and flat.

(2) The stomata close when light intensity is low.

(3) The upper epidermis of leaves has fewer stomata than the lower epidermis.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following processes in plants involve(s) active transport?

(1) transpiration

(2) absorption of minerals from the soil

(3) transport of water in the stem

• (1) only

• (2) only

• (1) and (2) only

• (2) and (3) only

Which of the following could help us distinguish xylem from phloem?

• The cells of xylem have cell walls.

• The cells of phloem carry out respiration.

• The cells of xylem are located in the vascular bundles.

• The cells of phloem are not present in the roots.

A strip of bark including the phloem has been removed from the stem of a tree.

Which of the following is the possible consequence?

• Amino acids cannot be transported to the roots.

• Water cannot be transported to the leaves.

• Water cannot be transported to the roots.

• Minerals cannot be transported to the leaves.

The diagram shows the cross section of a stem.

Which of the following statements about the water potential of the cells in the three tissues is correct?

• The water potential of tissue 3 is higher than that of tissue 2.

• The water potential of tissue 2 is higher than that of tissue 1.

• Tissues 2 and 3 have the same water potential.

• Tissues 1, 2 and 3 have the same water potential.