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

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

4 / 25

Laws of inheritance were proposed by

Isaac Newton

Mendel

Thomas Edison

None of these

5 / 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

6 / 25

A cross between a tall plant (TT) and short plant (tt) resulted in progeny that were all tall plants as:

Tallness is the dominant trait

Shortness is the dominant trait

Tallness is the recessive trait

Height of plant is not governed by gene t or t

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

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

Offspring produced by asexual method of reproduction have more similarity among themselves because:

Asexual reproduction involves only one parent

Asexual reproduction does not involve gametes

Asexual reproduction occurs before sexual reproduction

Asexual reproduction occurs after sexual reproduction

10 / 25

The characteristics transmitted from parents to ofspring are present in

Cytoplasm

Ribosome

Golgi bodies

Genes

11 / 25

Which of the following statements are true for fowers?

Flowers are always bisexual

They are the sexual reproductive organs

They are produced in all groups of plants

After fertilization they give rise to fruits

2 And 4

1 and 2

2 and 3

1 and 4

12 / 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

13 / 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

14 / 25

The development foetus takes place in mother’s body from

Ovaries

Embryo

Placenta

Fallopian Tube

15 / 25

Which of the following is surgical method of birth control in females?

Tubectomy

Vasectomy

Both 1 & 2

None Of These

16 / 25

A small family is a happy family means

A couple with only two children.

A couple with only four children.

A couple with only three children.

A couple with only two children.

17 / 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

18 / 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

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

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

21 / 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

22 / 25

Oxygen liberated during photosynthesis comes from:

Water

Chlorophyll

Carbon dioxide

Glucose

23 / 25

Which one of the following diets would you recommended to the affected patient?

High sugar and low fat diet.

Low sugar and high protein diet.

High Carb and low fiber diet.

Low sugar and high fiber diet

24 / 25

The two substances which are selectively reabsorbed from Nephriitic filtrate into the blood.

Glucose and salts

haemoglobin and salts

Starch & Glucose

none of these

25 / 25

Which of the following is an important component of haemoglobin

calcium

potassium

Sodium

Iron

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CBSE Class X – Science Biology Exam ( Full Syllabus)

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