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) : 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

2 / 25

The major function of cellular DNA is

to store information and pass it to ofspring.

to store information and pass it to parents.

to store information and not pass it to ofspring.

none of these

3 / 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

4 / 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

5 / 25

As claimed by the evolutionary theory, formation of a new species is generally due to

Sudden creation by nature.

Accumulation of variations over several generations

Clones formed during asexual reproduction.

Movement of individuals from one habitat to another

6 / 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

7 / 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.

8 / 25

Select the accurate statement:

The tendril of a pea plant and the phylloclade of Opuntia are homologous.

The tendril of a pea plant and the phylloclade of Opuntia are analogous.

The wings of birds and the limbs of lizards are analogous

The wings of bird and the wings of bats are homologous.

9 / 25

Choose the precise statement(s) on budding in yeast from the following:

A parent cell divides into two or more daughter cells and here the parent identity is lost

In this the elongated nucleus divides to form two or more daughter nuclei.

A bud arises from a particular region on a parent body

After detaching from the parent body the bud grows into a new independent individual

10 / 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

11 / 25

What is the mode of asexual reproduction in hydra?

Fragmentation

Binary Fission

Spore Formation

Regeneration Or Budding

12 / 25

What do you understand by Puberty?

The age at which the reproductive organs of boys and girls become non functional.

The age at which the reproductive organs of boys and girls become functional.

It is a process of fertilisation in boys and girls.

None of these

13 / 25

In flowers,what is the female reproductive part called as?

Pistil Or Carpel

Ovaries

Filaments

Stigma

14 / 25

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

Tubectomy

Vasectomy

Both 1 & 2

None Of These

15 / 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.

16 / 25

The number of chromosomes shared from both male & female are

26 from each

23 from each

46 from each

12 from each

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

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

Single circulation, i.e., blood fows through the heart only once during one cycle of passage through the body, is manifested by:

Labeo, Chameleon, Salamander

Hippocampus, Exocoetus, Anabas

Hyla, Rana, Draco

Whale, dolphin, turtle

20 / 25

The blood leaving the tissues becomes richer in:

Carbon dioxide

Water

Haemoglobin

Oxygen

21 / 25

The organ of the circulatory system in humans.

Veins

Nose

Lungs

Kidney

22 / 25

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

Starch

Glucose

Starch & Glucose

none of these

23 / 25

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

gets destroyed

collapse

does not collapse

none of these

24 / 25

Bowman’s capsules of nephrons acts as

transfer of urea

ultra filters

both 1 & 2

none of these

25 / 25

What does a low hemoglobin level mean?

referred to as low red blood count.

referred to as high red blood count.

referred to as low/high red blood count.

none of these

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CBSE Class X – Science Biology Exam ( Full Syllabus)

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