10th Class Biological Science - Practice MCQs

1. The autotrophic mode of nutrition requires: A) Carbon dioxide and water B) Chlorophyll C) Sunlight D) All of the above

2. The breakdown of pyruvate to give carbon dioxide, water, and energy takes place in the: A) Cytoplasm B) Mitochondria C) Chloroplast D) Nucleus

3. The kidneys in human beings are a part of the system for: A) Nutrition B) Respiration C) Excretion D) Transportation

4. The gap between two neurons is called a: A) Dendrite B) Synapse C) Axon D) Impulse

5. Which of the following is a plant hormone that specifically promotes cell division? A) Insulin B) Thyroxin C) Oestrogen D) Cytokinin

6. Asexual reproduction takes place through budding in: A) Amoeba B) Yeast C) Plasmodium D) Leishmania

7. The anther of a flower contains: A) Sepals B) Ovules C) Carpel D) Pollen grains

8. According to Mendel's experiments, what is the genotypic ratio of an F2 generation in a standard monohybrid cross? A) 3:1 B) 1:2:1 C) 9:3:3:1 D) 1:1

9. In a typical food chain, the third trophic level is always occupied by: A) Producers B) Herbivores C) Carnivores D) Decomposers

10. Which of the following primarily limits the number of trophic levels in a food chain? A) Decrease in available energy at higher trophic levels B) Insufficient food supply in the ecosystem C) Accumulation of toxic chemicals D) Shortage of water

Answer Key

  1. D (All of the above)

  2. B (Mitochondria)

  3. C (Excretion)

  4. B (Synapse)

  5. D (Cytokinin)

  6. B (Yeast)

  7. D (Pollen grains)

  8. B (1:2:1)

  9. C (Carnivores)

  10. A (Decrease in available energy at higher trophic levels)1

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