Plant Water Relations Questions with Answers

Plant Water Relations questions with answers cover essential biology concepts such as osmosis, transpiration, and water potential in plants. These biology questions and answers are commonly asked in NEET, AIIMS, and medical entrance exams, helping students understand how plants absorb, transport, and utilize water efficiently. Practicing these MCQs enhances conceptual clarity about plant physiology and cellular mechanisms. Students can download biology PDFs and attempt online quizzes to improve accuracy and recall for competitive medical exams.

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What is the process by which plants lose water vapor through their leaves?

A Transpiration
B Respiration
C Photosynthesis
D Osmosis

Answer: Option A

Explanation: Transpiration is the evaporation of water from plant surfaces, mainly through stomata in leaves.

Which tissue is responsible for transporting water and minerals from roots to leaves in plants?

A Xylem
B Phloem
C Cambium
D Epidermis

Answer: Option A

Explanation: Xylem is the vascular tissue that transports water and dissolved minerals upward from roots to shoots.

What is the main driving force for water movement in the xylem?

A Transpiration pull
B Root pressure
C Capillary action
D Gravity

Answer: Option A

Explanation: Transpiration pull created by water evaporation from leaves creates tension that pulls water upward.

Which process involves the movement of water across a semi-permeable membrane?

A Osmosis
B Diffusion
C Active transport
D Plasmolysis

Answer: Option A

Explanation: Osmosis is the diffusion of water through a semi-permeable membrane from low to high solute concentration.

What is the term for the shrinking of plant cell cytoplasm away from the cell wall due to water loss?

A Plasmolysis
B Cytolysis
C Deplasmolysis
D Hemolysis

Answer: Option A

Explanation: Plasmolysis occurs when plant cells lose water in hypertonic solutions, causing cytoplasm to shrink.

Which cells control the opening and closing of stomata?

A Guard cells
B Epidermal cells
C Mesophyll cells
D Companion cells

Answer: Option A

Explanation: Guard cells regulate stomatal opening and closing through changes in turgor pressure.

What is the cohesion-tension theory primarily concerned with?

A Water transport in xylem
B Sugar transport in phloem
C Mineral absorption
D Stomatal regulation

Answer: Option A

Explanation: This theory explains water transport in xylem through cohesion between water molecules and tension from transpiration.

Which factor does NOT increase the rate of transpiration?

A High humidity
B High temperature
C Wind
D Light intensity

Answer: Option A

Explanation: High humidity reduces transpiration rate by decreasing the vapor pressure gradient.

What is the term for the attraction between water molecules?

A Cohesion
B Adhesion
C Surface tension
D Capillarity

Answer: Option A

Explanation: Cohesion refers to the hydrogen bonding between water molecules that allows them to stick together.

Q10

Which process describes water movement from root epidermis to xylem?

A Apoplast pathway
B Symplast pathway
C Transmembrane pathway
D Vacuolar pathway

Answer: Option A

Explanation: The apoplast pathway involves water movement through cell walls and intercellular spaces without crossing membranes.

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BIOLOGY-Plant Water Relations Questions and Answers

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BIOLOGY-Plant Water Relations Questions and Answers

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