Biology MCQs with answers Page - 256

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A

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Q. Which organelle detoxifies drugs?

  • (A) Rough ER
  • (B) Smooth ER
  • (C) Golgi
  • (D) Lysosome

A

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Q. Assertion (A): Crossing over increases variation.
Reason (R): Exchange of genetic material occurs between homologous chromosomes.

  • (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 is not a function of liver?

  • (A) Bile secretion
  • (B) Detoxification
  • (C) Insulin secretion
  • (D) Glycogen storage

A

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Q. Assertion (A): Mutation can be beneficial.
Reason (R): It introduces variation.

  • (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 vitamin is antioxidant?

  • (A) Vitamin A
  • (B) Vitamin C
  • (C) Vitamin D
  • (D) Vitamin K

A

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Q. Assertion (A): Ecosystem is self-sustaining.
Reason (R): Energy flow and nutrient cycling occur.

  • (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 enzyme synthesizes DNA?

  • (A) RNA polymerase
  • (B) DNA polymerase
  • (C) Ligase
  • (D) Helicase

A

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Q. Assertion (A): ATP is energy currency.
Reason (R): It stores energy in phosphate bonds.

  • (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 is a nitrogen-fixing bacterium?

  • (A) Rhizobium
  • (B) E. coli
  • (C) Lactobacillus
  • (D) Salmonella

A

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Q. Assertion (A): Blood is connective tissue.
Reason (R): It has cells suspended in matrix.

  • (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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