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) : A single copy of ‘T’ is enough to make the plant tall. Reason (R) : Tallness trait (T) in Mendel’s experiment is a dominant trait.

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

Why did Mendel carry out an experiment to study inheritance of two traits in garden-pea

To see the interaction and basis of inheritance between them.

To see the Difference between them.

Just to Observe them

none of these

3 / 25

What were his fndings with respect to inheritance of traits in F1 and F2 generation by Mendle?

Feature of only one parental type appear

None of these

4 / 25

A group of grass hoppers – some green and some brown-lived in grassland having dry bushes and dry grass. Name the phenomeneon

Natural Selection

Natural inheritance

law of dominance

law of independence

5 / 25

Exchange of genetic material takes place in:

Vegetative reproduction

Asexual reproduction

Sexual reproduction

Budding

6 / 25

Select the group which shares the maximum number of common characters

Two species of a genus

Two genera of a family

Two individuals of a species

Two genera of two families

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

Select the inappropriate statement:

The frequency of certain genes in a population change over several generations resulting in evolution.

The reduction in the weight of an organism due to starvation is genetically controlled.

Low weight parents can have heavy weight progeny.

Traits which are not inherited over generations do not cause evolution.

9 / 25

Which among the following statements are true for sexual reproduction in fowering plants?

It requires two types of gametes.

Fertilisation is a compulsory event.

It always results in the formation of zygote.

Offsprings formed are clone

1 , 2 and 3

2 and 3

1 and 3

2 and 4

10 / 25

Which one of the following permanently marks the end of menstrual cycle in females ?

Menarche

Menopause

Ovulation

Pregnancy

11 / 25

What is the mode of asexual reproduction in Rhizopus

Spore Formation

Fragmentation

Budding

Binary Fission

12 / 25

Which of the following is a Bacterial STD?

Warts

Syphilis

Hiv-Aids

All Of These

13 / 25

which of the following is a viral STD?

Gonorrhoea

Syphilis.

Both 1 & 2

HIV-Aids And Warts

14 / 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

15 / 25

Blocking of fallopian tubes prevents ?

Pregnancy

Sexually transmitted diseases

Genetic uniformity

None Of These

16 / 25

Total number of chromosomes present in human beings are

46

23

24

48

17 / 25

A few drops of iodine solution were put on to rice water. The solution turned blue-black in colour. This specify that the rice water contains:

Complex proteins

Simple proteins

Cats

Starch

18 / 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

19 / 25

Select the event that does not materialise in photosynthesis.

Absorption of light energy by chlorophyll

Reduction of carbon dioxide to carbohydrates

Oxidation of carbon to carbon dioxide

Conversion of light energy to chemical energy

20 / 25

The xylem in plants are responsible for

Transport of water

Transport of food

Transport of amino acids

Transport of oxygen

21 / 25

How many chambers are there in the heart of an amphibian?

2

3

4

6

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 ways in which glucose is oxidized to provide energy in various organisms

Aerobic respiration

Anaerobic Respiration

Aerobic & Anaerobic

none of these

24 / 25

In which form do plants store the carbohydrates which are not used immediately?

Starch

Glucose

Starch & Glucose

none of these

25 / 25

Human skin is impermeable to gas because

to minimise the loss of water from the skin

to maximise the loss of water from the skin

to minimise /maximise the loss of water from the skin

none of these

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CBSE Class X – Science Biology Exam ( Full Syllabus)

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