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

Total number of chromosomes along with the sex chromosomes that are present in a human female and a human male.

46

23

64

32

2 / 25

Exchange of genetic material takes place in:

Vegetative reproduction

Asexual reproduction

Sexual reproduction

Budding

3 / 25

The maleness of a child is determined by:

The X chromosome in the zygote

The Y chromosome in the zygote

The cytoplasm of the germ cell which determines the sex

Sex is determined by chance

4 / 25

The number of pair(s) of sex chromosomes in the zygote of humans is

One

Two

Three

Four

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

If the fossil of an organism is found in the deeper layers of earth, then we can predict that:

The extinction of the organism occurred recently

The extinction of the organism occurred thousands of years ago

The fossil position in the layers of Earth is not related to its time of extinction.

The time of extinction cannot be determined.

7 / 25

In human males, all the chromosomes are match up perfectly except one. These unpaired chromosomes are:

Large chromosome

Small chromosome

Y chromosome

X chromosome

3 and 4

2 and 3

1 and 4

3

8 / 25

In peas, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plants to pure short plants in F2 generation will be:

1 : 3

3:01

1:01

2:01

9 / 25

During adolescence, several changes occur in the human body. mark one change from the following associated with sexual maturation in boys:

Loss of milk teeth

Increase in height

Cracking of voice

Weight gain

10 / 25

Assertion (A): A basic event in reproduction is the creation of a DNA copy. Reason (R) : The DNA in the cell nucleus is the information source for making proteins.

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

11 / 25

Slides of binary fission in Amoeba and budding in yeast were given for observa group of students. Some of the observations reported by the group are given below:

Cytokinesis was observed in the yeast cell.

A chain of buds were observed in Amoeba.

Single cell of Amoeba and single cell of yeast were undergoing binary fission and budding respectively

Elongated nucleus was dividing to form two daughter nuclei in Amoeba

3 and 4

2 and 3

3

1 and 4

12 / 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

13 / 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

14 / 25

What is the mode of asexual reproduction in hydra?

Fragmentation

Binary Fission

Spore Formation

Regeneration Or Budding

15 / 25

What is the mode of asexual reproduction in Rhizopus

Spore Formation

Fragmentation

Budding

Binary Fission

16 / 25

Total number of chromosomes present in human beings are

46

23

24

48

17 / 25

If salivary amylase is lacking in the saliva, which of the Subsequent events in the mouth cavity will be affected?

Proteins breaking down into amino acids

Starch breaking down into sugars

Cats breaking down into fatty acids and glycerol

Absorption of vitamins

18 / 25

In the excretory system of human beings, some substances in the beginning fitrate such as glucose, amino acids, salts and water are selectively reabsorbed in:

Urethra

Nephron

Ureter

Urinary bladder

19 / 25

When air is blown from mouth into a test tube suppress lime water, the lime water turns milky due to the presence of:

Oxygen

Carbon dioxide

Nitrogen

Water vapour

20 / 25

The blood leaving the tissues becomes richer in:

Carbon dioxide

Water

Haemoglobin

Oxygen

21 / 25

The red pigment which carries oxygen in the blood.

Haemoglobin

Platelets

Veins

Capillaries

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

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

2

4

3

1

24 / 25

Which of the following is an important component of haemoglobin

calcium

potassium

Sodium

Iron

25 / 25

Name an enzyme present in pancreatic juice

Trypsin

lipase

lipase & Trypsin

none of these

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CBSE Class X – Science Biology Exam ( Full Syllabus)

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