Biology MCQs with answers Page - 254

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A

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Q. Which mineral is required for hemoglobin formation?

  • (A) Calcium
  • (B) Iron
  • (C) Potassium
  • (D) Sodium

A

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Q. Which process releases energy in cells?

  • (A) Photosynthesis
  • (B) Respiration
  • (C) Transpiration
  • (D) Digestion

A

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Q. Assertion (A): DNA polymerase III has high processivity.
Reason (R): It is associated with sliding clamp proteins.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are true but R is not correct
  • (C) A is true but R is false
  • (D) A is false but R is true

A

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Q. Assertion (A): Photorespiration decreases photosynthetic efficiency.
Reason (R): RuBisCO acts as oxygenase in presence of high O2.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are true but R is not correct
  • (C) A is true but R is false
  • (D) A is false but R is true

A

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Q. Which of the following shows maximum genetic diversity?

  • (A) Self-pollination
  • (B) Asexual reproduction
  • (C) Cross-pollination
  • (D) Vegetative propagation

A

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Q. Assertion (A): In C4 plants, photorespiration is negligible.
Reason (R): CO2 is concentrated in bundle sheath cells.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are true but R is not correct
  • (C) A is true but R is false
  • (D) A is false but R is true

A

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Q. Which molecule acts as second messenger?

  • (A) DNA
  • (B) cAMP
  • (C) ATP
  • (D) NADH

A

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Q. Assertion (A): Hemoglobin shows cooperative binding.
Reason (R): Binding of one O2 increases affinity for next O2.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are true but R is not correct
  • (C) A is true but R is false
  • (D) A is false but R is true

A

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Q. Which phase is longest in meiosis I?

  • (A) Leptotene
  • (B) Zygotene
  • (C) Pachytene
  • (D) Diplotene

A

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Q. Assertion (A): Auxins promote apical dominance.
Reason (R): They inhibit lateral bud growth.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are true but R is not correct
  • (C) A is true but R is false
  • (D) A is false but R is true

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