Biology MCQ Questions with answers

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Here Important Biology MCQ questions are added which are frequently asked in almost all the examinations. You can check the correct answer of any question on clicking the show answer button. The Correct answer will be displayed below. You can share any question with your friends on whatsapp by tapping Share button.

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📊 Biology
Q. Which is the largest gland in human body?
  • (A) Pancreas
  • (B) Liver
  • (C) Thyroid
  • (D) Adrenal
💬 Discuss
✅ Correct Answer: (B) Liver

Explanation: Liver is the largest gland.

📊 Biology
Q. Which scientist proposed the fluid mosaic model of plasma membrane?
  • (A) Watson and Crick
  • (B) Singer and Nicolson
  • (C) Robert Hooke
  • (D) Darwin
💬 Discuss
✅ Correct Answer: (B) Singer and Nicolson

Explanation: Singer and Nicolson proposed the fluid mosaic model in 1972.

📊 Biology
Q. Which of the following is a steroid hormone?
  • (A) Insulin
  • (B) Testosterone
  • (C) Glucagon
  • (D) Oxytocin
💬 Discuss
✅ Correct Answer: (B) Testosterone

Explanation: Testosterone is a steroid hormone derived from cholesterol.

📊 Biology
Q. Which plant tissue is responsible for secondary growth?
  • (A) Apical meristem
  • (B) Intercalary meristem
  • (C) Lateral meristem
  • (D) Parenchyma
💬 Discuss
✅ Correct Answer: (C) Lateral meristem

Explanation: Lateral meristem increases girth of plant.

📊 Biology
Q. Which of the following is a polysaccharide?
  • (A) Glucose
  • (B) Fructose
  • (C) Sucrose
  • (D) Starch
💬 Discuss
✅ Correct Answer: (D) Starch

Explanation: Starch is a polysaccharide made of glucose units.

📊 Biology
Q. Which process occurs in mitochondria?
  • (A) Glycolysis
  • (B) Krebs cycle
  • (C) Transcription
  • (D) Translation
💬 Discuss
✅ Correct Answer: (B) Krebs cycle

Explanation: Krebs cycle occurs in mitochondrial matrix.

📊 Biology
Q. Which structure is responsible for filtration in kidney?
  • (A) Bowman's capsule
  • (B) Glomerulus
  • (C) Loop of Henle
  • (D) Collecting duct
💬 Discuss
✅ Correct Answer: (B) Glomerulus

Explanation: Glomerulus filters blood under pressure.

📊 Biology
Q. Which of the following is a nitrogenous base in DNA?
  • (A) Uracil
  • (B) Thymine
  • (C) Xanthine
  • (D) Hypoxanthine
💬 Discuss
✅ Correct Answer: (B) Thymine

Explanation: Thymine is present in DNA, uracil in RNA.

📊 Biology
Q. Which phase of meiosis shows crossing over?
  • (A) Prophase I
  • (B) Metaphase I
  • (C) Anaphase I
  • (D) Telophase I
💬 Discuss
✅ Correct Answer: (A) Prophase I

Explanation: Crossing over occurs in pachytene stage of Prophase I.

📊 Biology
Q. Which vitamin is essential for RBC formation?
  • (A) Vitamin A
  • (B) Vitamin B12
  • (C) Vitamin C
  • (D) Vitamin D
💬 Discuss
✅ Correct Answer: (B) Vitamin B12

Explanation: Vitamin B12 is needed for RBC maturation.

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