Biology MCQ Questions with answers

WhatsApp Facebook 🖤 Twitter

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.

Learn Biology mcqs in hindi here.

📊 Biology
Q. Which organ secretes bile?
  • (A) Pancreas
  • (B) Liver
  • (C) Gall bladder
  • (D) Stomach
💬 Discuss
✅ Correct Answer: (B) Liver

Explanation: Liver produces bile; gall bladder stores it.

📊 Biology
Q. Which hormone is called emergency hormone?
  • (A) Insulin
  • (B) Adrenaline
  • (C) Thyroxine
  • (D) Cortisol
💬 Discuss
✅ Correct Answer: (B) Adrenaline

Explanation: Adrenaline prepares body for fight or flight.

📊 Biology
Q. Which is the site of Calvin cycle?
  • (A) Thylakoid
  • (B) Stroma
  • (C) Matrix
  • (D) Cytoplasm
💬 Discuss
✅ Correct Answer: (B) Stroma

Explanation: Calvin cycle occurs in chloroplast stroma.

📊 Biology
Q. Which enzyme breaks hydrogen bonds in DNA?
  • (A) Ligase
  • (B) Helicase
  • (C) Polymerase
  • (D) Primase
💬 Discuss
✅ Correct Answer: (B) Helicase

Explanation: Helicase unwinds DNA.

📊 Biology
Q. Which structure forms spindle fibers?
  • (A) Centrosome
  • (B) Ribosome
  • (C) Golgi body
  • (D) Lysosome
💬 Discuss
✅ Correct Answer: (A) Centrosome

Explanation: Centrosome organizes spindle fibers.

📊 Biology
Q. Which hormone regulates sleep cycle?
  • (A) Melatonin
  • (B) Insulin
  • (C) Thyroxine
  • (D) Estrogen
💬 Discuss
✅ Correct Answer: (A) Melatonin

Explanation: Melatonin controls circadian rhythm.

📊 Biology
Q. Which part of brain regulates temperature?
  • (A) Cerebrum
  • (B) Hypothalamus
  • (C) Cerebellum
  • (D) Medulla
💬 Discuss
✅ Correct Answer: (B) Hypothalamus

Explanation: Hypothalamus maintains body temperature.

📊 Biology
Q. Which type of immunity is provided by vaccines?
  • (A) Natural immunity
  • (B) Artificial active immunity
  • (C) Passive immunity
  • (D) Innate immunity
💬 Discuss
✅ Correct Answer: (B) Artificial active immunity

Explanation: Vaccines stimulate active immune response.

📊 Biology
Q. Which plant hormone causes fruit ripening?
  • (A) Auxin
  • (B) Gibberellin
  • (C) Ethylene
  • (D) Cytokinin
💬 Discuss
✅ Correct Answer: (C) Ethylene

Explanation: Ethylene promotes ripening.

📊 Biology
Q. Which structure carries oxygen in blood?
  • (A) Plasma
  • (B) Hemoglobin
  • (C) Platelets
  • (D) WBC
💬 Discuss
✅ Correct Answer: (B) Hemoglobin

Explanation: Hemoglobin binds oxygen.

Jump to

Tags: Biology mcqs, important mcqs of Biology, Biology important Biology mcqs, mcqs on Biology, important mcqs on Biology, mcqs of Biology

Attempt 200+ Quizzes on Biology

📱 Download Our App

Learn MCQs on the go with our easy-to-use Android app

Get it on Google Play

📚 Select Subject

Click on any subject to explore thousands of MCQs and start practicing