Biology 9th Chap 8 : Topic 9 - Maryam Publications

Biology Chapter 8 : Topic 9

Transport of Water and Mineral Salts

1 / 15

Water and mineral salts are transported from roots to leaves mainly through:

A) Xylem

B) Epidermis

C) Phloem

D) Cortex

2 / 15

Which structure first absorbs water from the soil?

A) Guard cells

B) Root hairs

C) Xylem vessels

D) Phloem tubes

3 / 15

After entering root hairs, water moves toward the xylem mainly by:

A) Respiration

B) Translocation

C) Osmosis

D) Photosynthesis

4 / 15

Which force is primarily responsible for pulling water upward in tall plants?

A) Root pressure only

B) Gravity

C) Transpiration pull

D) Diffusion

5 / 15

Mineral salts are transported in plants mainly in:

A) Water within xylem vessels

B) Phloem sap only

C) Guard cells

D) Air spaces of leaves

6 / 15

Which process creates the transpiration pull?

A) Respiration in roots

B) Photosynthesis in stems

C) Evaporation of water from leaf surfaces

D) Absorption of minerals by roots

7 / 15

Root pressure helps in:

A) Producing glucose

B) Transporting food

C) Opening stomata

D) Pushing water upward from roots

8 / 15

The continuous column of water in xylem is maintained due to:

A) Pollination

B) Digestion

C) Fermentation

D) Cohesion between water molecules

9 / 15

Adhesion helps water transport by:

A) Closing stomata

B) Binding minerals together

C) Attaching water molecules to xylem walls

D) Producing ATP

10 / 15

Which event occurs first in the transport of water?

A) Absorption by root hairs

B) Transpiration from leaves

C) Entry into xylem

D) Root pressure develops

11 / 15

If transpiration suddenly stops, the upward movement of water will:

A) Become independent of xylem

B) Be greatly reduced

C) Increase rapidly

D) Stop photosynthesis immediately

12 / 15

Which tissue transports water only in one direction?

A) Epidermis

B) Phloem

C) Cortex

D) Xylem

13 / 15

A plant placed in a humid environment may show slower water transport because:

A) Transpiration rate decreases

B) Root hairs disappear

C) Minerals become insoluble

D) Xylem is blocked

14 / 15

Which combination is directly involved in the upward movement of water?

A) Photosynthesis, respiration, and diffusion

B) Cohesion, adhesion, and transpiration pull

C) Osmosis, digestion, and excretion

D) Germination, pollination, and fertilization

15 / 15

Which statement best describes the mechanism of transport of water and salts in plants?

A) Water and salts are absorbed by root hairs and carried upward through xylem by transpiration pull.

B) Water is transported by stomata directly to roots.

C) Water and salts move from leaves to roots through phloem.

D) Mineral salts move independently without water.

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