Which category of animal is the hummingbird an example of?
Correct answer B. Heterotherm
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Biology MCQs
Page 55 of Biology multiple-choice questions with answers. Tap an option to check yourself.
Page 55 of 75
Cellulose is the main component of which part of a plant cell?
Correct answer B. Primary wall
Which organism converts ammonia or ammonium ions into nitrites in the nitrogen cycle?
Correct answer C. Nitrosomonas
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What is the approximate annual rainfall in grassland ecosystems?
Correct answer A. 250-750 mm
Which layer of the cell wall is laid down first by the protoplast?
Correct answer A. Primary wall
Apart from light, what mainly determines the productivity of an aquatic ecosystem?
Correct answer C. Nutrients
What is movement of substances across the cell membrane that needs no metabolic energy called?
Correct answer C. Passive transport
Which ecosystem is not found in Pakistan?
Correct answer B. Tropical rain forest
Which is the most constant abiotic component of an ecosystem?
Correct answer B. Gravity
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What percentage of the cell membrane is made of protein?
Correct answer B. 60-80%
Who supported the theory of special creation?
Correct answer A. Linnaeus
In the Hardy-Weinberg equation, what does p² represent?
Correct answer D. Homozygous dominant individual
In hot conditions, which of the following does not happen or occurs only at a low level?
Correct answer B. Thermogenesis
What causes the “lubb” heart sound?
Correct answer B. Closure of inlet valve
What is the main cause of ozone depletion?
Correct answer B. Chlorofluorocarbons
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In fishes, which part of the heart does deoxygenated blood enter first?
Correct answer C. Sinus venosus
According to the cohesion-tension theory, what creates the tension that pulls water up the xylem?
Correct answer D. Transpiration
What proportion of total transpiration is cuticular transpiration?
Correct answer C. 5-7%
Which of these respiratory disorders is infectious?
Correct answer B. Tuberculosis
Which phloem cells are directly involved in transporting organic solutes?
Correct answer D. Sieve element