The process of water evaporation from the leaves that creates a pulling force for water ascent is: MCQ with Answer and Explanation

The process of water evaporation from the leaves that creates a pulling force for water ascent is:
A. Capillary action
B. Transpiration
C. Root pressure
D. Guttation
Answer: Option B
Solution (By JKSSB Mock Tests)
Transpiration from stomata creates negative water potential in leaves, generating a tension (transpiration pull) that draws water upward through the xylem from roots. This cohesion-tension mechanism is the primary driver of water transport in tall trees. Root pressure and capillary action are minor forces.

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Practice More Biology Questions

Question #1
The structure that produces antibodies is:
A. Macrophage
B. Plasma cell (B cell)
C. Neutrophil
D. T lymphocyte

Correct Answer: Option B


Explanation:
Plasma cells, differentiated from B lymphocytes, are the factories that produce and secrete large amounts of antibodies (immunoglobulins) specific to an antigen. Macrophages phagocytose, T cells regulate or directly kill, neutrophils phagocytose bacteria.

This question belongs to: Science Biology
Question #2
The 'Hormone Galanin' is a neuropeptide widely distributed in the central nervous system and the gastrointestinal tract. Its functions include:
A. Stimulating insulin release
B. Stimulating gastric acid secretion
C. Inhibiting insulin and glucagon release, and inhibiting gastric emptying and intestinal motility
D. Increasing appetite

Correct Answer: Option C


Explanation:
Galanin is a 29-amino acid neuropeptide that is co-localized with several other neurotransmitters and hormones. In the central nervous system, it is involved in various functions, including the inhibition of acetylcholine release and modulation of pain. In the gastrointestinal tract and pancreas, its primary functions are inhibitory: it inhibits the release of both insulin and glucagon from the pancreatic islets, inhibits gastric emptying and gastric acid secretion, and generally inhibits intestinal motility and secretion. It acts to slow down digestion and nutrient absorption.

This question belongs to: Science Biology
Question #3
The bone that protects the brain is the:
A. Vertebra
B. Sternum
C. Pelvis
D. Cranium

Correct Answer: Option D


Explanation:
The cranium (skull) is composed of several bones fused together, encasing and protecting the brain. Vertebrae protect the spinal cord, sternum protects the heart and lungs anteriorly, pelvis supports abdominal organs and connects to legs. The cranium also provides attachment for muscles.

This question belongs to: Science Biology