1. What is the primary function of xylem in plants?
a) Transport of food
b) Transport of water and minerals
c) Transport of hormones
d) Transport of sugars
Answer: b) Transport of water and minerals
2. What type of cells primarily make up xylem?
a) Parenchyma cells
b) Collenchyma cells
c) Tracheids and vessel elements
d) Phloem cells
Answer: c) Tracheids and vessel elements
3. Which of the following is transported by phloem?
a) Water
b) Oxygen
c) Sugars
d) Carbon dioxide
Answer: c) Sugars
4. The flow of water in the xylem is driven by:
a) Active transport
b) Diffusion
c) Capillary action and transpiration
d) Osmosis
Answer: c) Capillary action and transpiration
5. Which of the following is not a part of the phloem tissue?
a) Sieve tube elements
b) Companion cells
c) Xylem vessels
d) Phloem parenchyma
Answer: c) Xylem vessels
6. What is the main function of phloem in plants?
a) Transport of nutrients
b) Transport of water
c) Transport of sugars from leaves to other parts
d) Transport of oxygen
Answer: c) Transport of sugars from leaves to other parts
7. Which of the following is responsible for the upward movement of water in plants?
a) Cohesion and adhesion of water molecules
b) Active transport
c) Capillary action only
d) Gravity
Answer: a) Cohesion and adhesion of water molecules
8. Which of the following structures is involved in the process of transpiration in plants?
a) Phloem
b) Stomata
c) Xylem
d) Roots
Answer: b) Stomata
9. Which of the following occurs in the phloem?
a) Transport of minerals
b) Transport of water
c) Transport of organic nutrients
d) Transport of gases
Answer: c) Transport of organic nutrients
10. What type of transport occurs in the phloem to move sugars from the source to the sink?
a) Active transport
b) Bulk flow or pressure flow
c) Diffusion
d) Osmosis
Answer: b) Bulk flow or pressure flow
11. Which of these is true about xylem vessels?
a) They have living cells
b) They are involved in the transport of water
c) They contain sieve plates
d) They only transport sugars
Answer: b) They are involved in the transport of water
12. The movement of water in plants through the xylem is powered by:
a) Transpiration pull
b) Phloem loading
c) Root pressure
d) Both a and c
Answer: d) Both a and c
13. Which part of the plant is responsible for absorbing water from the soil?
a) Leaves
b) Stem
c) Roots
d) Flowers
Answer: c) Roots
14. Which of the following is not a characteristic of phloem tissue?
a) It has sieve tube elements
b) It contains companion cells
c) It transports water and minerals
d) It is involved in the transport of sugars
Answer: c) It transports water and minerals
15. Which of the following structures are responsible for the upward movement of water in plants?
a) Phloem
b) Stomata
c) Xylem
d) Chloroplasts
Answer: c) Xylem
16. What is the function of sieve tube elements in phloem?
a) Transport of sugars
b) Transport of water
c) Structural support
d) Storage of food
Answer: a) Transport of sugars
17. Which of the following best describes the phloem in terms of cell types?
a) It is made up of dead cells
b) It contains sieve tube elements and companion cells
c) It consists of tracheids and vessel elements
d) It contains only parenchyma cells
Answer: b) It contains sieve tube elements and companion cells
18. What is the primary driving force for the upward movement of water through xylem?
a) Root pressure
b) Evaporation from leaves
c) Phloem pressure
d) Gravity
Answer: b) Evaporation from leaves
19. What type of cells in the xylem help in the movement of water by providing structural support?
a) Companion cells
b) Parenchyma cells
c) Tracheids and vessel elements
d) Sieve tube elements
Answer: c) Tracheids and vessel elements
20. In phloem, which cells help in the loading of sugars from the source to the sieve tubes?
a) Xylem parenchyma cells
b) Companion cells
c) Tracheids
d) Epidermal cells
Answer: b) Companion cells
21. The movement of water in the xylem occurs due to a combination of:
a) Capillary action and root pressure
b) Cohesion and adhesion of water molecules
c) Active transport and diffusion
d) Transpiration and gravity
Answer: b) Cohesion and adhesion of water molecules
22. What is the function of companion cells in phloem?
a) They store sugars
b) They help in the loading and unloading of sugars into sieve tubes
c) They provide mechanical support
d) They store water
Answer: b) They help in the loading and unloading of sugars into sieve tubes
23. Which of the following helps to prevent the collapse of xylem vessels?
a) Lignin
b) Phloem
c) Chlorophyll
d) Cellulose
Answer: a) Lignin
24. In plants, what is the source of water for transpiration?
a) Air
b) Soil
c) Leaves
d) Stem
Answer: b) Soil
25. Which of the following is a primary role of the phloem?
a) Transporting water from the roots to the leaves
b) Transporting food from the leaves to other parts of the plant
c) Providing mechanical support to the plant
d) Storing water and nutrients
Answer: b) Transporting food from the leaves to other parts of the plant
26. What is the main structural difference between xylem and phloem?
a) Xylem contains sieve tube elements; phloem contains tracheids
b) Xylem is made of dead cells; phloem is made of living cells
c) Phloem is made of dead cells; xylem is made of living cells
d) Xylem transports sugars; phloem transports water
Answer: b) Xylem is made of dead cells; phloem is made of living cells
27. Which of the following is true regarding xylem and phloem?
a) Xylem is responsible for transporting water, while phloem transports sugars
b) Xylem transports sugars; phloem transports water
c) Xylem is involved in photosynthesis
d) Phloem transports water, and xylem transports minerals
Answer: a) Xylem is responsible for transporting water, while phloem transports sugars
28. Which of the following is true about root pressure?
a) Root pressure pushes water into the leaves
b) Root pressure occurs when water is lost through transpiration
c) Root pressure helps in the movement of water through the phloem
d) Root pressure is a significant factor in the movement of water in the xylem
Answer: d) Root pressure is a significant factor in the movement of water in the xylem
29. Which of the following is involved in the movement of sugars in the phloem?
a) Capillary action
b) Active transport and pressure flow mechanism
c) Root pressure
d) Osmosis
Answer: b) Active transport and pressure flow mechanism
30. In the xylem, the transport of water is most efficient in which type of vessel?
a) Tracheids
b) Sieve tubes
c) Vessel elements
d) Companion cells
Answer: c) Vessel elements
