Class 10 Biology Free Mock Test Online – MBOSE – 50 Questions

Question 1

Which of the following statements is true about autotrophic nutrition?

Accepted Answer

Organisms synthesize their own food using simple inorganic substances.

Question 2

What is the primary function of villi in the small intestine?

Accepted Answer

To increase the surface area for absorption of digested food.

Question 3

Which organ is responsible for filtering out nitrogenous waste products like urea from the blood?

Accepted Answer

Kidneys

Question 4

During respiration, the breakdown of glucose into pyruvate occurs in which part of the cell?

Accepted Answer

Cytoplasm

Question 5

Which component of blood is primarily responsible for transporting oxygen?

Accepted Answer

Red blood cells

Question 6

The opening and closing of the stomata are regulated by which cells?

Accepted Answer

Guard cells

Question 7

Which of the following is a characteristic of aerobic respiration?

Accepted Answer

It yields a large amount of ATP.

Question 8

The function of xylem in plants is to transport:

Accepted Answer

Water and minerals

Question 9

Which part of the brain is responsible for maintaining posture and balance?

Accepted Answer

Cerebellum

Question 10

The hormone responsible for the 'fight or flight' response in humans is:

Accepted Answer

Adrenaline

Question 11

Which plant hormone promotes the growth of the stem and fruit ripening?

Accepted Answer

Auxin

Question 12

A reflex arc involves:

Accepted Answer

Receptor, sensory neuron, spinal cord, motor neuron, and effector.

Question 13

Insulin is secreted by which gland?

Accepted Answer

Pancreas

Question 14

Nervous tissue is made up of organized network of nerve cells or neurons. What is the function of neurons?

Accepted Answer

To transmit electrical impulses.

Question 15

What is the role of receptors in our body?

Accepted Answer

To detect external and internal stimuli.

Question 16

Which of the following methods of asexual reproduction is observed in Hydra?

Accepted Answer

Budding

Question 17

The transfer of pollen grains from the anther to the stigma of a flower is called:

Accepted Answer

Pollination

Question 18

Which part of the female reproductive system is the site of fertilization in humans?

Accepted Answer

Fallopian tube (Oviduct)

Question 19

Asexual reproduction results in offspring that are:

Accepted Answer

Genetically identical to the parent.

Question 20

The sexually transmitted disease caused by a bacterium is:

Accepted Answer

Gonorrhea

Question 21

What is the purpose of the seminal vesicles and prostate gland in the male reproductive system?

Accepted Answer

To provide nutrients and fluid to sperm.

Question 22

Contraceptive methods prevent pregnancy by:

Accepted Answer

Preventing fertilization or implantation.

Question 23

Which of the following is a protective layer for the developing embryo inside the uterus?

Accepted Answer

Amniotic fluid

Question 24

What is regeneration in organisms?

Accepted Answer

The ability of an organism to regrow lost or damaged body parts.

Question 25

Mendel chose pea plants for his experiments because:

Accepted Answer

They show distinct contrasting traits.

Question 26

An individual with genotype 'Tt' for height (where 'T' is tall and 't' is dwarf) will exhibit which phenotype?

Accepted Answer

Tall

Question 27

Who proposed the theory of natural selection?

Accepted Answer

Charles Darwin

Question 28

Which of the following is an example of an analogous organ?

Accepted Answer

Wings of a bird and wings of an insect.

Question 29

The process by which new species evolve from existing ones is known as:

Accepted Answer

Speciation

Question 30

If a tall pea plant (TT) is crossed with a dwarf pea plant (tt), what will be the genotype of the F1 generation?

Accepted Answer

Tt

Question 31

Which chromosome pair determines the sex of a human male?

Accepted Answer

XY

Question 32

What is the study of heredity and variation called?

Accepted Answer

Genetics

Question 33

Fossils provide strong evidence for evolution by showing:

Accepted Answer

The existence of organisms that are now extinct.

Question 34

The sequence of organisms through which energy is transferred is known as a:

Accepted Answer

Food chain

Question 35

Which of the following is a biodegradable waste?

Accepted Answer

Vegetable peels

Question 36

In an ecosystem, producers are primarily:

Accepted Answer

Autotrophs

Question 37

The depletion of the ozone layer is primarily caused by:

Accepted Answer

Chlorofluorocarbons (CFCs)

Question 38

What is the role of decomposers in an ecosystem?

Accepted Answer

To break down dead organic matter and return nutrients to the soil.

Question 39

The '10 percent law' in ecology states that:

Accepted Answer

Only 10% of available energy is transferred from one trophic level to the next.

Question 40

Which of the following is a greenhouse gas?

Accepted Answer

Carbon dioxide

Question 41

What causes biomagnification in a food chain?

Accepted Answer

Accumulation of non-biodegradable chemicals at successive trophic levels.

Question 42

The main excretory product in humans is:

Accepted Answer

Urea

Question 43

Which part of the heart receives oxygenated blood from the lungs?

Accepted Answer

Left atrium

Question 44

Lenticels are involved in:

Accepted Answer

Gaseous exchange

Question 45

Which gland is known as the 'master gland' because it controls the activity of other endocrine glands?

Accepted Answer

Pituitary gland

Question 46

The protective layers covering the brain and spinal cord are called:

Accepted Answer

Meninges

Question 47

Vegetative propagation is beneficial for plants that:

Accepted Answer

Do not produce viable seeds.

Question 48

What is the term for the irreversible increase in size and mass of an organism?

Accepted Answer

Growth

Question 49

The primary cause of acid rain is:

Accepted Answer

Sulphur dioxide and nitrogen oxides emissions.

Question 50

Which of these is a biotic component of an ecosystem?

Accepted Answer

Bacteria

Question 51

The part of the eye that controls the amount of light entering it is the:

Accepted Answer

Pupil

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