Plant Physiology - Transport in Plants
Q. What is the main driving force for the movement of water in plants? (2023)
A.
Root pressure
B.
Capillary action
C.
Transpiration pull
D.
Gravity
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Solution
Transpiration pull, created by the evaporation of water from the leaves, is the main driving force for water movement in plants.
Correct Answer: C — Transpiration pull
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Q. What is the primary role of root hairs in plants?
A.
Photosynthesis
B.
Water absorption
C.
Nutrient storage
D.
Gas exchange
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Solution
Root hairs increase the surface area for water absorption from the soil.
Correct Answer: B — Water absorption
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Q. What is the term for the loss of water vapor from the aerial parts of plants? (2020)
A.
Transpiration
B.
Evaporation
C.
Condensation
D.
Respiration
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Solution
Transpiration is the process of water vapor loss from the aerial parts of plants, mainly through stomata.
Correct Answer: A — Transpiration
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Q. What is the term for the movement of water across a semi-permeable membrane?
A.
Diffusion
B.
Osmosis
C.
Active transport
D.
Facilitated diffusion
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Solution
Osmosis is the movement of water across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Correct Answer: B — Osmosis
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Q. What is the term for the movement of water through a plant against gravity?
A.
Translocation
B.
Transpiration
C.
Capillarity
D.
Hydrolysis
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Solution
Transpiration refers to the process of water movement through a plant and its evaporation from aerial parts, which helps in moving water against gravity.
Correct Answer: B — Transpiration
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Q. Which hormone is primarily involved in the regulation of stomatal opening?
A.
Auxin
B.
Gibberellin
C.
Abscisic acid
D.
Cytokinin
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Solution
Abscisic acid plays a key role in closing stomata during water stress, thus regulating water loss.
Correct Answer: C — Abscisic acid
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Q. Which hormone is primarily involved in the regulation of water loss in plants? (2023)
A.
Auxin
B.
Gibberellin
C.
Abscisic acid
D.
Cytokinin
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Solution
Abscisic acid plays a crucial role in regulating water loss by causing stomatal closure during water stress.
Correct Answer: C — Abscisic acid
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Q. Which of the following factors does NOT affect the rate of transpiration? (2022)
A.
Humidity
B.
Temperature
C.
Wind speed
D.
Soil type
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Solution
Soil type does not directly affect the rate of transpiration; however, it can influence water availability.
Correct Answer: D — Soil type
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Q. Which of the following is a factor affecting the rate of transpiration?
A.
Temperature
B.
Humidity
C.
Wind speed
D.
All of the above
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Solution
All of these factors influence the rate of transpiration in plants.
Correct Answer: D — All of the above
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Q. Which of the following is a method of active transport in plants? (2019)
A.
Osmosis
B.
Endocytosis
C.
Ion pumps
D.
Diffusion
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Solution
Ion pumps are a form of active transport that move ions against their concentration gradient using energy.
Correct Answer: C — Ion pumps
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Q. Which of the following is a method of water transport in plants?
A.
Cohesion
B.
Adhesion
C.
Both cohesion and adhesion
D.
None of the above
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Solution
Both cohesion (water molecules sticking to each other) and adhesion (water molecules sticking to other surfaces) are important for water transport in plants.
Correct Answer: C — Both cohesion and adhesion
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Q. Which of the following is NOT a method of water transport in plants?
A.
Osmosis
B.
Diffusion
C.
Active transport
D.
Photosynthesis
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Solution
Photosynthesis is a process that converts light energy into chemical energy, not a method of water transport.
Correct Answer: D — Photosynthesis
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Q. Which process is primarily responsible for the movement of water in plants? (2020)
A.
Diffusion
B.
Osmosis
C.
Active transport
D.
Transpiration
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Solution
Transpiration creates a negative pressure in the leaves, which helps in the upward movement of water through the xylem.
Correct Answer: D — Transpiration
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Q. Which structure in plants is primarily responsible for the uptake of water? (2021)
A.
Stomata
B.
Root hairs
C.
Xylem vessels
D.
Phloem tubes
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Solution
Root hairs increase the surface area for water absorption from the soil.
Correct Answer: B — Root hairs
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Q. Which structure in the leaf is primarily responsible for gas exchange?
A.
Stomata
B.
Cuticle
C.
Chloroplasts
D.
Xylem
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Solution
Stomata are small openings on the leaf surface that allow for gas exchange, including the intake of carbon dioxide and the release of oxygen.
Correct Answer: A — Stomata
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