CBSE Class 10 Biology MCQs All Chapters Set 03

Science Objective Questions and Answers: All Chapters

Access targeted multiple-choice questions for All Chapters designed to align with the latest CBSE academic syllabus for Class 10 Science. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

Download All Chapters MCQs with Answers

Access the complete set of multiple-choice questions for All Chapters below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.

Multiple Choice Questions

Question 1: Vermicompost is an/a
(a) inorganic fertilizer
(b) toxic substance
(c) organic bio fertilizer
(d) synthetic fertilizer
Show Answer & Explanation

Answer: (c) organic bio fertilizer

Explanation:
1. Vermicompost, made by earthworms from organic waste, is an organic manure/biofertilizer.

Question 2: Which one of the following crops enriches nitrogen content in the soil?
(a) Pea
(b) Sunflower
(c) Potato
(d) Wheat
Show Answer & Explanation

Answer: (a) Pea

Explanation:
1. Pea is a legume; Rhizobium bacteria in its root nodules fix atmospheric nitrogen and enrich the soil.

Question 3: Which one among the following kinds of organisms resides in the roots of pulse plants to do nitrogen fixation?
(a) Bacteria
(b) Fungi
(c) Protozoa
(d) Virus
Show Answer & Explanation

Answer: (a) Bacteria

Explanation:
1. Rhizobium bacteria in root nodules of legumes fix atmospheric nitrogen.

Question 4: Which one of the following plants is preferred for mixed cropping in order to enhance the bioavailability of nitrogen?
(a) Wheat
(b) Gram
(c) Maize
(d) Barley
Show Answer & Explanation

Answer: (b) Gram

Explanation:
1. Gram, a legume, fixes nitrogen through root nodule bacteria.

Question 5: Which one of the following is a freeliving bacterium that helps in nitrogen fixation in soil?
(a) Azotobacter
(b) Anabaena
(c) Azolla
(d) Nostoc
Show Answer & Explanation

Answer: (a) Azotobacter

Explanation:
1. Azotobacter is a free-living nitrogen-fixing soil bacterium; Anabaena and Nostoc are cyanobacteria and Azolla a fern.

Question 6: Which one of the following plants is used for green manuring in India?
(a) Wheat
(b) Sunnhemp
(c) Cotton
(d) Rice
Show Answer & Explanation

Answer: (b) Sunnhemp

Explanation:
1. Sunnhemp, a legume, is widely grown and ploughed in as green manure.

Question 7: Leguminous plants replenish the soil in the presence of _____
(a) Firmicutes
(b) Spirochaete
(c) Rhizobium
(d) Aquificae
Show Answer & Explanation

Answer: (c) Rhizobium

Explanation:
1. Leguminous plants replenish the soil by the presence of Rhizobium. It is a nitrogen fixing bacteria which lives in the roots of the leguminous plants.

Question 8: The universal recipient blood group is
(a) AB
(b) O
(c) A
(d) B
Show Answer & Explanation

Answer: (a) AB

Explanation:
1. AB persons can receive from all groups.

Question 9: Haemoglobin has highest affinity for
(a) Oxygen
(b) Carbon dioxide
(c) Carbon monoxide
(d) Nitrogen
Show Answer & Explanation

Answer: (c) Carbon monoxide

Explanation:
1. Haemoglobin has a much higher affinity for carbon monoxide than for oxygen.

Question 10: Haematopoiesis take place in
(a) Lungs
(b) Pancreas
(c) Liver
(d) Bone marrow
Show Answer & Explanation

Answer: (d) Bone marrow

Explanation:
1. Haematopoiesis (blood cell formation) takes place in the bone marrow.

Question 11: The human heart beats about how many times per minute at rest?
(a) 72-80
(b) 50-60
(c) 100-120
(d) 30-40
Show Answer & Explanation

Answer: (a) 72-80

Explanation:
1. The normal resting rate is around 72.

Question 12: Blood is a
(a) Liquid connective tissue
(b) Epithelial tissue
(c) Muscular tissue
(d) Nervous tissue
Show Answer & Explanation

Answer: (a) Liquid connective tissue

Explanation:
1. Its fluid matrix is plasma.

Question 13: Plasma contributes about what percentage of blood volume?
(a) 55 per cent
(b) 45 per cent
(c) 70 per cent
(d) 90 per cent
Show Answer & Explanation

Answer: (a) 55 per cent

Explanation:
1. Plasma contains 90-92 per cent water.

Question 14: White blood cells are responsible for
(a) Immunity
(b) Oxygen transport
(c) Clotting
(d) Digestion
Show Answer & Explanation

Answer: (a) Immunity

Explanation:
1. They are also called leucocytes.

Question 15: Platelets are responsible for
(a) Blood clotting
(b) Oxygen transport
(c) Immunity
(d) Digestion
Show Answer & Explanation

Answer: (a) Blood clotting

Explanation:
1. They are also called thrombocytes.

Question 16: The Rh factor is a type of protein found on the surface of
(a) Red blood cells
(b) White blood cells
(c) Platelets
(d) Plasma
Show Answer & Explanation

Answer: (a) Red blood cells

Explanation:
1. Those without it are Rh-negative.

Question 17: The suicidal bags of the cell are
(a) Lysosomes
(b) Ribosomes
(c) Dictyosomes
(d) Phagosomes
Show Answer & Explanation

Answer: (a) Lysosomes

Explanation:
1. Lysosomes are called the suicide bags of the cell.

Question 18: The smallest cell is that of
(a) Mycoplasma
(b) Bacteria
(c) Yeast
(d) Virus
Show Answer & Explanation

Answer: (a) Mycoplasma

Explanation:
1. It is a prokaryote.

Question 19: Mitochondria are called the
(a) Powerhouse of the cell
(b) Suicide bag
(c) Kitchen of the cell
(d) Brain of the cell
Show Answer & Explanation

Answer: (a) Powerhouse of the cell

Explanation:
1. They generate ATP.

Question 20: The cell wall is present in
(a) Plant cells
(b) Animal cells
(c) Both
(d) Neither
Show Answer & Explanation

Answer: (a) Plant cells

Explanation:
1. It is made of cellulose.

Question 21: The cell membrane is mainly composed of
(a) Lipids and proteins
(b) Cellulose
(c) Chitin
(d) Starch
Show Answer & Explanation

Answer: (a) Lipids and proteins

Explanation:
1. It controls the transport of molecules.

Question 22: Ribosomes were first observed by
(a) Palade
(b) Golgi
(c) Hooke
(d) Brown
Show Answer & Explanation

Answer: (a) Palade

Explanation:
1. They are the site of protein synthesis.

Question 23: Except mammalian red blood cells, all living cells have
(a) Ribosomes
(b) Nucleus
(c) Mitochondria
(d) Golgi
Show Answer & Explanation

Answer: (a) Ribosomes

Explanation:
1. Ribosomes make proteins.

Question 24: Rennin acts on the milk protein
(a) Casein
(b) Lactose
(c) Albumin
(d) Maltose
Show Answer & Explanation

Answer: (a) Casein

Explanation:
1. It is found in the stomach of infants.

Question 25: Lactase converts lactose into
(a) Glucose and galactose
(b) Glucose and fructose
(c) Maltose
(d) Amino acids
Show Answer & Explanation

Answer: (a) Glucose and galactose

Explanation:
1. It is present in intestinal juice.

Question 26: Sucrase converts sucrose into
(a) Glucose and fructose
(b) Glucose and galactose
(c) Maltose
(d) Amino acids
Show Answer & Explanation

Answer: (a) Glucose and fructose

Explanation:
1. It is also called invertase.

Question 27: Thyroxine regulates
(a) growth and metabolism
(b) blood sugar
(c) calcium level
(d) sleep
Show Answer & Explanation

Answer: (a) growth and metabolism

Explanation:
1. Thyroxine controls metabolic rate.

Question 28: Thyroxine is secreted by the
(a) Thyroid
(b) Pituitary
(c) Pancreas
(d) Adrenal
Show Answer & Explanation

Answer: (a) Thyroid

Explanation:
1. It regulates metabolism.

Question 29: Insulin is secreted by the
(a) Pancreas
(b) Liver
(c) Thyroid
(d) Pituitary
Show Answer & Explanation

Answer: (a) Pancreas

Explanation:
1. It regulates blood sugar.

Question 30: Too little insulin leads to
(a) Diabetes
(b) Goitre
(c) Dwarfism
(d) Cretinism
Show Answer & Explanation

Answer: (a) Diabetes

Explanation:
1. Blood sugar level rises.

Question 31: Testosterone is secreted by the
(a) Testes
(b) Ovary
(c) Adrenal
(d) Pituitary
Show Answer & Explanation

Answer: (a) Testes

Explanation:
1. It develops male secondary sexual characters.

Question 32: Oestrogen is secreted by the
(a) Ovary
(b) Testes
(c) Pituitary
(d) Thyroid
Show Answer & Explanation

Answer: (a) Ovary

Explanation:
1. It develops female secondary sexual characters.

Question 33: The anti-diuretic hormone controls the amount of water reabsorbed by the
(a) Kidney
(b) Liver
(c) Stomach
(d) Intestine
Show Answer & Explanation

Answer: (a) Kidney

Explanation:
1. It is released by the pituitary.

Question 34: Wings of birds and bats are considered analogous structures because they have
(a) common origin and common function
(b) different origin and common function
(c) common origin and different function
(d) different origin and different function
Show Answer & Explanation

Answer: (b) different origin and common function

Explanation:
1. Analogous organs have different origins but perform the same function, like wings of birds and bats.

Question 35: Which one of the following is an example of vestigial organ in man?
(a) Jaw apparatus
(b) Ear muscles
(c) Canine teeth
(d) Humerus
Show Answer & Explanation

Answer: (b) Ear muscles

Explanation:
1. Ear muscles (auricular muscles) are vestigial in humans.

Question 36: The fossil of Archaeopteryx represents the evidence of origin of
(a) birds from reptiles
(b) mammals from reptiles
(c) reptiles from amphibians
(d) mammals from birds
Show Answer & Explanation

Answer: (a) birds from reptiles

Explanation:
1. Archaeopteryx had both reptilian (teeth, tail) and bird (feathers) features, linking birds to reptiles.

Question 37: Which of the following is not a part of the Darwin‘s theory of evolution?
(a) Natural selection
(b) Struggle for existence
(c) Survival of the fittest
(d) Inheritance of acquired characters
Show Answer & Explanation

Answer: (d) Inheritance of acquired characters

Explanation:
1. Inheritance of acquired characters is Lamarck's idea, not part of Darwin's theory.

Question 38: Which one of the following is a vestigial organ ?
(a) Eye-brow
(b) Collar-bone
(c) Wisdom-teeth
(d) Nails
Show Answer & Explanation

Answer: (c) Wisdom-teeth

Explanation:
1. Wisdom teeth are vestigial organs in humans.

Question 39: ‘Darwin finches’ refers to a group of
(a) Fishes
(b) Lizards
(c) Birds
(d) Amphibians
Show Answer & Explanation

Answer: (c) Birds

Explanation:
1. Darwin's finches are a group of birds.

Question 40: Which one of the following is used for storing biological tissues?
(a) Liquid nitrogen
(b) Liquid helium
(c) Liquid argon
(d) Liquid bromine
Show Answer & Explanation

Answer: (a) Liquid nitrogen

Explanation:
1. Liquid nitrogen (−196 °C) is used for cryopreservation of cells and tissues.

Question 41: Green Biotechnology is applied to
(a) agricultural process
(b) medical sciences
(c) sea resources
(d) industrial process
Show Answer & Explanation

Answer: (a) agricultural process

Explanation:
1. Green biotechnology is biotechnology applied to agriculture, e.g. tissue culture and GM crops.

Question 42: Bt seed is associated with
(a) rice
(b) wheat
(c) cotton
(d) oilseeds
Show Answer & Explanation

Answer: (c) cotton

Explanation:
1. Bt cotton carries a gene from Bacillus thuringiensis that makes it resistant to bollworms; it is India's main GM crop.

Question 43: By using which one of the following techniques, is DNA fingerprinting done?
(a) ELISA
(b) RIA
(c) Northern Blotting
(d) Southern Blotting
Show Answer & Explanation

Answer: (d) Southern Blotting

Explanation:
1. DNA fingerprinting uses Southern blotting of DNA fragments.

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All Chapters Objective Questions & Solutions for Class 10 Science

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