General Science | Questions
Biology questions with solutions
Biology is a General Science topic for competitive exams. It appears across bank and railway exams. This page has 34 solved biology questions written to the official pattern, with a worked solution under each.
- Question 1Easy
Which gas do green plants take in from the air for photosynthesis?
- A.Carbon dioxideCorrect
- B.Oxygen
- C.Nitrogen
- D.Hydrogen
Show solution
Plants absorb carbon dioxide from the air and, using sunlight and water, make food and release oxygen during photosynthesis.
- Question 2Easy
Which is the largest gland in the human body?
- A.LiverCorrect
- B.Pancreas
- C.Thyroid
- D.Kidney
Show solution
The liver is the largest gland (and largest internal organ) in the human body. The kidney is an organ, not a gland.
- Question 3Easy
Which gas do green plants absorb from the atmosphere during photosynthesis?
- A.Carbon dioxideCorrect
- B.Oxygen
- C.Nitrogen
- D.Hydrogen
Show solution
During photosynthesis plants absorb carbon dioxide and release oxygen.
- Question 4Easy
Which cell organelle is known as the 'powerhouse of the cell'?
- A.MitochondriaCorrect
- B.Nucleus
- C.Ribosome
- D.Golgi body
Show solution
Mitochondria are called the powerhouse of the cell because they produce most of the cell's energy (ATP) through respiration.
- Question 5Easy
The largest gland in the human body is the:
- A.thyroid
- B.pancreas
- C.liverCorrect
- D.salivary gland
Show solution
The liver is the largest gland and the largest internal organ; it secretes bile and performs hundreds of metabolic functions.
- Question 6Easy
Which gas do plants absorb during photosynthesis?
- A.Helium
- B.Oxygen
- C.Carbon dioxideCorrect
- D.Nitrogen
Show solution
Plants absorb carbon dioxide during photosynthesis.
- Question 7Easy
Which gas is released by green plants during photosynthesis?
- A.Carbon dioxide
- B.Nitrogen
- C.OxygenCorrect
- D.Hydrogen
Show solution
Plants take in carbon dioxide and release oxygen as a by-product of photosynthesis.
- Question 8Easy
What is the natural satellite of the Earth called?
- A.The Sun
- B.Venus
- C.Mars
- D.The MoonCorrect
Show solution
The Moon is Earth’s natural satellite.
- Question 9Easy
The 'powerhouse' of the cell is the:
- A.MitochondriaCorrect
- B.Nucleus
- C.Ribosome
- D.Chloroplast
- E.Vacuole
Show solution
The mitochondria release energy from food through respiration, which is why they are called the powerhouse of the cell.
- Question 10Easy
Which gas do plants take in from the air for photosynthesis?
- A.Carbon dioxideCorrect
- B.Oxygen
- C.Nitrogen
- D.Hydrogen
- E.Methane
Show solution
Plants absorb carbon dioxide from the air and, using sunlight, convert it with water into food, releasing oxygen.
- Question 11Easy
The powerhouse of the cell is the:
- A.Nucleus
- B.Ribosome
- C.MitochondrionCorrect
- D.Vacuole
Show solution
The mitochondrion is called the powerhouse of the cell.
- Question 12Easy
How many bones are there in the adult human body?
- A.206Correct
- B.300
- C.256
- D.196
Show solution
An adult human skeleton has 206 bones; a newborn has around 300 that later fuse.
These are 12 of 34 biology questions in the bank. Attempt the rest with instant feedback in the practice drills, or under a clock in the mock tests.
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Frequently asked questions
How many Biology questions are here?
This page shows 12 worked biology questions from a bank of 34, spanning 23 easy, 11 moderate and 0 hard. The full set is available to attempt in the timed-free practice drills and the mock tests.
Which exams ask Biology questions?
Biology is a standard General Science topic across bank and railway recruitment exams.
Are these Biology questions free, and are the answers reliable?
Yes. Every question is free, written in-house to the exam pattern rather than copied from a real paper, and the numeric answer keys are recomputed independently at build time — a wrong key fails the build rather than reaching you.