CBSE Class X – Science Biology Exam ( Full Syllabus)

This test is designed based on NCERT Syllabus for Class 10 Topics of Science – Biology

Each time random 25 questions will be displaced from the question bank of 500 + Questions
So we recommend you to retake the quiz till you have mastered all the questions

1 / 25

Assertion (A) : In human beings, sex of the individual is not genetically determined. Reason (R) : The genes inherited from our parents decide whether we will be boys or girls.

Both (A) and (R) are true and (R) is correct explanation of the assertion

Both (A) and (R) are true but (R) is not the correct explanation of the assertion

(A) is true but (R) is false

(A) is false but (R) is true

2 / 25

What is the phenotypic ratio obtained in Mendels dihybrid cross

9:3:3:1

9:3:2:1

9:3:1:1

9:9:3:1

3 / 25

Which of the following statement is inappropriate?

For every hormone there is a gene.

For every protein there is a gene.

For production of every enzyme there is a gene.

For every molecule of fat there is a gene.

4 / 25

A trait in an organism is infuenced by:

Paternal DNA only

Maternal DNA only

Both maternal and paternal DNA

Neither paternal nor maternal DNA

5 / 25

Choose the statements that describe the characteristics of genes:

Genes are specifc sequence of bases in a DNA molecule

A gene does not code for proteins.

In individuals of a given species, a specifc gene is located on a particular chromosome.

Each chromosome has only one gene

1

1 and 3

3 and 4

3

6 / 25

A zygote which has an X chromosome inherited from the father will develop into a:

Boy

Girl

X chromosome does not determine the sex of a child

Either boy or girl

7 / 25

Select the accurate statement:

The tendril of a pea plant and the phylloclade of Opuntia are homologous.

The tendril of a pea plant and the phylloclade of Opuntia are analogous.

The wings of birds and the limbs of lizards are analogous

The wings of bird and the wings of bats are homologous.

8 / 25

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that:

Reptiles have evolved from birds

There is no evolutionary connection between reptiles and birds.

Feathers are homologous structures in both the organisms.

Birds have evolved from reptiles.

9 / 25

Choose the precise statement(s) on budding in yeast from the following:

A parent cell divides into two or more daughter cells and here the parent identity is lost

In this the elongated nucleus divides to form two or more daughter nuclei.

A bud arises from a particular region on a parent body

After detaching from the parent body the bud grows into a new independent individual

10 / 25

The length of pollen tube depends upon the distance between:

Pollen grain and upper surface of stigma

Pollen grain on upper surface of stigma and ovule

Pollen grain in anther and upper surface of stigma

Upper surface of stigma and lower part of style

11 / 25

Reproduction is essential for living organisms to order to:

Keep the individual organism alive

Fulfll their energy requirements

Maintain growth

Continue the species generation after generation

12 / 25

Assertion (A): Vegetative propagation makes possible propagation of plants that have lost the capacity to produce seeds. Reason (R) : New plants are developed from seeds in vegetative propagation.

Both (A) and (R) are true and (R) is correct explanation of the assertion

Both (A) and (R) are true but (R) is not the correct explanation of the assertion

(A) is true but (R) is false

(A) is false but (R) is true

13 / 25

Example of unisexual fowers.

Papaya

Mustard

Hibiscus

Rose

14 / 25

What is the mode of asexual reproduction in hydra?

Fragmentation

Binary Fission

Spore Formation

Regeneration Or Budding

15 / 25

A pair of long convoluted tubes that carry ova or eggs from the ovary to the uterus is known as

Tubectomy

Callopian Tube

Fallopian Tube

All Of These

16 / 25

The development foetus takes place in mother’s body from

Ovaries

Embryo

Placenta

Fallopian Tube

17 / 25

In which part of the alimentary canal food is ultimately digested?

Stomach

Mouth cavity

Large intestine

Small intestine

18 / 25

Which is the true sequence of air passage during inhalation?

Nostrils → Larynx → Pharynx → Trachea → Lungs

Nasal passage → Trachea → Pharynx → Larynx → Alveoli

Larynx → Nostrils → Pharynx → Lungs

Nostrils → Pharynx → Larynx → Trachea → Alveoli

19 / 25

Which of the subsequent statement(s) is/are true about heart?

2 and 4

1 and 3

2 and 4

1 and 4

20 / 25

Single circulation, i.e., blood fows through the heart only once during one cycle of passage through the body, is manifested by:

Labeo, Chameleon, Salamander

Hippocampus, Exocoetus, Anabas

Hyla, Rana, Draco

Whale, dolphin, turtle

21 / 25

The organ of the circulatory system in humans.

Veins

Nose

Lungs

Kidney

22 / 25

Is it necessary to separate oxygenated and deoxygenated blood in mammals and birds.

Yes

No

May be yes

May be no

23 / 25

The rings of cartilage present in the throat ensure that the air passage

gets destroyed

collapse

does not collapse

none of these

24 / 25

How many chambers are there in the heart of an Human being?

2

4

3

1

25 / 25

Respiratory pigment in human body is

Haemoglobin.

water

chlorophyll

none of these

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CBSE Class X – Science Biology Exam ( Full Syllabus)

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