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) : Acquired traits cannot be passed from one generation to next generation. Reason (R) : Inaccuracy during DNA copying of acquired trait is minimum.

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

Assertion (A) : New combination of traits are observed in F2 offspring when tall plants with round seeds are crossed with short plants with wrinkled seeds. Reason (R) : Tallness and round seed are both dominant traits.

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

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

5 / 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

6 / 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

7 / 25

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

Boy

Girl

Y chromosome does not determine the sex of a child

Either boy or girl

8 / 25

Which one is a Feasible progeny in F2 generation of pure bred tall plant with round seed and dwarf plant with wrinkled seeds?

Tall plant with round seeds

Tall plant with wrinkled seeds

Dwarf plant with round seed

All of the above

9 / 25

Characters that are transmitted from parents to ofspring during reproduction

Only similarities with parents

Only variations with parents

Both similarities and variations with parents

Neither similarities nor variations

10 / 25

The ability of a cell to divide into several cells during reproduction in Plasmodium is called

Budding vision

Reduction division

Binary fission multiple fission

Multiple fission

11 / 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

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

Characters transmitted from parents to ofspring are present in:

Cytoplasm

RIbosome

Golgi complex

Genes

14 / 25

Which one of the following best describes the function of the umbilical cord?

Feeds the embryo with digested substances

Conveys nutrients and wastes to and from the embryo respectively

Removes waste matter from the embryo to the mothers blood

Supplies oxygenated blood from the mother to the embryo

15 / 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

16 / 25

Name the organ that produces sperms in human males.

Testes

Testosterone

Both 1 & 2

None Of These

17 / 25

Pseudopodia are:

Small hair-like structures present on unicellular organisms.

False feet developed in some unicellular organisms

Long, tube-like structures coming out of the mouth

Suckers which are attached to the walls of the intestines. glomerulus and tubular region (Renal tubule). Glucose, amino acids and salts are selectively reabsorbed in tabular region

18 / 25

Anaerobic process:

Takes place in yeast during fermentation.

Takes place in the presence of oxygen.

Produces only energy in the muscles of human beings.

Produces ethanol, oxygen and energy.

19 / 25

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

Stomach

Mouth cavity

Large intestine

Small intestine

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

The organ of the circulatory system in humans.

Veins

Nose

Lungs

Kidney

22 / 25

The red pigment which carries oxygen in the blood.

Haemoglobin

Platelets

Veins

Capillaries

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

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

gets destroyed

collapse

does not collapse

none of these

25 / 25

The Fluid collected in the Bowman’s capsule as a result of ultrafiltration is called

blood

urine

nephric filtrate

urea

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CBSE Class X – Science Biology Exam ( Full Syllabus)

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