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

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

2 / 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

3 / 25

Mendel crossed the round and green seeded pea plants with the wrinkled and yellow seeded pea plants. Give the phenotypic ratio of F2 generation.

Round Yellow : Round Green : Wrinkled Yellow : wrinkled Green = 9 : 3 : 2: 1.

Round Yellow : Round Green : Wrinkled Yellow : wrinkled Green = 8 : 3 : 3 : 1.

Round Yellow : Round Green : Wrinkled Yellow : wrinkled Green = 9 : 3 : 3 : 1.

Round Yellow : Round Green : Wrinkled Yellow : wrinkled Green = 4: 3 : 3 : 1.

4 / 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

5 / 25

A basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the exact homologous structures?

Carrot and potato

Carrot and tomato

Radish and carrot

Radish and potato

6 / 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

7 / 25

Name the organ analogous to the wings of birds.

Forelimb of human

Wings of insect

Fore-leg of horse

None of these

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

In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called

Filaments

Hyphae

Rhizoids

Roots

10 / 25

Factors responsible for the rapid spread of bread mould on slices of bread are:

Large number of spores

Availability of moisture and nutrients in the bread

Presence of tubular branched hyphae

Formation of round shaped sporangia

1

2

1 And 2

1 and 3

11 / 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

12 / 25

Example of unisexual fowers.

Papaya

Mustard

Hibiscus

Rose

13 / 25

What is the mode of asexual reproduction in hydra?

Fragmentation

Binary Fission

Spore Formation

Regeneration Or Budding

14 / 25

which of the following is a viral STD?

Gonorrhoea

Syphilis.

Both 1 & 2

HIV-Aids And Warts

15 / 25

Which pollination increases genetic uniformity and decreases variations

Cross Pollination

Self Pollination

Both 1 & 2

None Of These

16 / 25

Total number of chromosomes present in human beings are

46

23

24

48

17 / 25

Select the function of the pancreatic Juice from the following:

Trypsin digests proteins and lipase carbohydrates

Trypsin digests emulsifed fats and lipase proteins

Trypsin and lipase digest fats

Trypsin digests proteins and lipase digests emulsifed fats droplets

18 / 25

Which of the following declaration (s) is (are) true about respiration? (i)During inhalation, ribs move inward and diaphragm is raised. (ii) In the alveoli, exchange of gases takes place i.e. oxygen form alveolar air diffuses into blood and carbon dioxide from blood into alveolar air. (iii) Haemoglobin has greater afinity for carbon dioxide than oxygen. (iv) Alveoli increases surface area for exchange of gases.

2 and 4

1 and 4

2 and 3

1 and 3

19 / 25

Oxygen liberated during photosynthesis comes from:

Water

Chlorophyll

Carbon dioxide

Glucose

20 / 25

Which of the following is an inappropriate statement?

Organisms grow with time.

Organisms must repair and maintain their structure.

Movement of molecules does not take place among cells.

Energy is essential for life processes.

21 / 25

The opening and closing of the stomatal pore depends upon:

Oxygen

Temperature

Water in guard cells

Concentration of CO2 in stomata

22 / 25

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

2

3

4

6

23 / 25

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

Yes

No

May be yes

May be no

24 / 25

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

Starch

Glucose

Starch & Glucose

none of these

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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