Question 61:
The primary function of xylem vessels is to:
A) Transport sugars
B) Transport water
C) Store nutrients
D) Conduct photosynthesis
Answer: B) Transport water
Explanation: Xylem vessels are specialized for transporting water and minerals from the roots to the rest of the plant.
Question 62:
Which of the following factors can enhance the rate of photosynthesis?
A) Low light intensity
B) High temperature
C) Increased carbon dioxide concentration
D) Decreased humidity
Answer: C) Increased carbon dioxide concentration
Explanation: Higher levels of carbon dioxide can enhance photosynthesis, as it is one of the key reactants in the process.
Question 63:
What is the main role of phloem in plants?
A) Support
B) Nutrient transport
C) Water transport
D) Gas exchange
Answer: B) Nutrient transport
Explanation: Phloem is primarily responsible for transporting organic nutrients, particularly sugars, from photosynthetic tissues to other parts of the plant.
Question 64:
Which of the following is a characteristic of transpiration?
A) It is an active process.
B) It helps in nutrient uptake.
C) It occurs only at night.
D) It creates a negative pressure in the xylem.
Answer: D) It creates a negative pressure in the xylem.
Explanation: Transpiration leads to a negative pressure in the xylem, which helps pull water upward from the roots.
Question 65:
What type of tissue is primarily responsible for the transport of water in the root?
A) Parenchyma
B) Xylem
C) Phloem
D) Collenchyma
Answer: B) Xylem
Explanation: Xylem tissue is responsible for the transport of water and dissolved minerals from the roots to the rest of the plant.
Question 66:
The primary site for photosynthesis in a leaf is located in the:
A) Epidermis
B) Stomata
C) Mesophyll
D) Cuticle
Answer: C) Mesophyll
Explanation: Mesophyll cells contain chloroplasts where photosynthesis occurs, making them the primary site for this process in leaves.
Question 67:
What is the role of the sieve plate in phloem?
A) Water transport
B) Nutrient absorption
C) Facilitating the flow of sap
D) Storage of carbohydrates
Answer: C) Facilitating the flow of sap
Explanation: Sieve plates are perforated structures in phloem that allow for the efficient flow of sap and nutrients between sieve tube elements.
Question 68:
Which of the following processes does NOT occur in the xylem?
A) Water conduction
B) Mineral transport
C) Photosynthesis
D) Support
Answer: C) Photosynthesis
Explanation: Photosynthesis occurs in the chloroplasts of mesophyll cells, not in the xylem. The xylem’s primary functions are water conduction, mineral transport, and providing structural support.
Question 69:
Which type of roots is adapted to enhance water absorption in arid conditions?
A) Shallow roots
B) Deep roots
C) Adventitious roots
D) Aerial roots
Answer: B) Deep roots
Explanation: Deep roots can access moisture from deeper soil layers, making them advantageous for water absorption in arid conditions.
Question 70:
The movement of water through a plant is mainly influenced by:
A) Soil pH
B) Photosynthesis
C) Transpiration
D) Fertilizer application
Answer: C) Transpiration
Explanation: Transpiration creates a negative pressure that pulls water upward through the xylem, driving the movement of water from roots to leaves.
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