The openings on the leaf surface for gas exchange are called: MCQ with Answer and Explanation

The openings on the leaf surface for gas exchange are called:
A. Stomata
B. Lenticels
C. Cuticles
D. Hydathodes
Answer: Option A
Solution (By JKSSB Mock Tests)
Stomata are pores flanked by guard cells that regulate gas exchange and transpiration. Lenticels are on bark, hydathodes for guttation.

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Practice More Biology Questions

Question #1
The energy currency of the cell is:
A. ATP
B. NADH
C. FADH₂
D. Glucose

Correct Answer: Option A


Explanation:
Adenosine triphosphate (ATP) stores and transfers energy in cells via high-energy phosphate bonds. Hydrolysis of ATP to ADP releases energy for endergonic reactions. Glucose and NADH/FADH₂ are energy sources but not direct energy carriers usable by most enzymes; ATP is the immediate energy donor.

This question belongs to: Science Biology
Question #2
The scientist who introduced the term 'biology' was:
A. Linnaeus
B. Aristotle
C. Darwin
D. Lamarck and Treviranus

Correct Answer: Option D


Explanation:
The term 'biology' was independently coined by Jean-Baptiste Lamarck (France) and Gottfried Reinhold Treviranus (Germany) around 1802. Aristotle is father of biology, Linnaeus taxonomy, Darwin evolution.

This question belongs to: Science Biology
Question #3
The type of cell division that occurs during growth and repair is:
A. Binary fission
B. Fragmentation
C. Meiosis
D. Mitosis

Correct Answer: Option D


Explanation:
Mitosis is the equational division that produces genetically identical daughter cells, used for growth, development, and tissue repair. Meiosis produces gametes, binary fission is prokaryotic, fragmentation is asexual reproduction.

This question belongs to: Science Biology