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Biology 1525 MCQs [All-Courses]

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Biology covers key concepts of life, organisms, and human systems with exam-focused notes for PPSC, FPSC, KPPSC, BPSC.,NTS, OTS, AJKPSC. Clear, concise topics help students prepare effectively for competitive tests.

All Topics  1525

Which of the following is a compensation point:
A Leaves respire and utilize O2 and release CO2.
B Photosynthesis and respiration occur at same rate. So there is not net exchange of gases between atmosphere and plants.
C Rate of photosynthesis increases, so do the O2 production, with a net release of oxygen coupled with the uptake of CO2.
D Rate of respiration becomes more than rate of photosynthesis.
Correct Answer: Photosynthesis and respiration occur at same rate. So there is not net exchange of gases between atmosphere and plants.
Molecular formula of chlorophyll b is_____________?
A C55 H10 O4 N6 Mg
B C55 H70 O6 N5 Mg
C C55 H71 O6 N4 Mg
D C55 H70 O6 N4 Mg
Correct Answer: C55 H70 O6 N5 Mg
At which times there is no net gaseous exchange between leaves and the atmosphere.
A Day time.
B Night time.
C Dawn & Dusk.
D Mid night.
Correct Answer: Dawn & Dusk.
Bacteriochlorophylls does not include________________?
A Chlorophyll e
B Chlorophyll d
C Chlorophyll a
D Chlorophyll c
Correct Answer: Chlorophyll a
C6H12O6 + 6O2 ? 6CO2 + 6H20 + ENERGY represents:____________?
A Photosynthesis
B Aerobic respiration
C Anaerobic respiration
D Respiration
Correct Answer: Aerobic respiration
Photosynthesis is process in which ________ compounds of carbon (CO2) and hydrogen (H2O) are reduced to carbohydrate like (glucose) using light energy.
A Organic
B Energy rich
C Energy poor
D Reduced
Correct Answer: Energy poor
Which of the following is a chemical link between catabolism and anabolism?
A AMP
B ADP
C ATP
D All of these
Correct Answer: ATP
Which of the following feature is not related to neuron?
A Conduction
B Regeneration
C Reflex
D Movement
Correct Answer: Regeneration
Receptors for hearing come under heading of___________?
A Chemical
B Mechanical
C Photo
D Nociceptors
Correct Answer: Mechanical
Value of resting membrane potential is_____________?
A 0.03 V
B 0.05 V
C 0.07 V
D 0.09V
Correct Answer: 0.07 V
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