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

Newly formed DNA copies

are identical

may not be identical

both 1 & 2

none of these

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

Select correct option about variation?

The differences in characteristics between individuals of the same species is called variation.

Variations arise in organisms during the process of copying the DNA due to which the DNA copies will be similar but not identical to the original

1

2

Both 1 & 2

None of these

6 / 25

The Phenomeneon of Natural Selection was done by

Charles Darwin

Mendel

Thomas Edison

None of these

7 / 25

Which of the following statement is inappropriate?

For every hormone there is a gene.

For every protein there is a gene.

For production of every enzyme there is a gene.

For every molecule of fat there is a gene.

8 / 25

The number of pair(s) of sex chromosomes in the zygote of humans is

One

Two

Three

Four

9 / 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

10 / 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

11 / 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

12 / 25

The number of chromosomes in parents and ofsprings of a particular species remains unchanged due to

Doubling of chromosomes during gamate formation.

Halving of chromosomes during gamate formation

Halving of chromosomes during zygote formation

Doubling of chromosomes during gamate formation

13 / 25

which of the following is a viral STD?

Gonorrhoea

Syphilis.

Both 1 & 2

HIV-Aids And Warts

14 / 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

15 / 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

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

If salivary amylase is lacking in the saliva, which of the Subsequent events in the mouth cavity will be affected?

Proteins breaking down into amino acids

Starch breaking down into sugars

Cats breaking down into fatty acids and glycerol

Absorption of vitamins

18 / 25

Which part of alimentary canal collects bile from the liver?

Stomach

Small intestine

Large intestine

Oesophagus

19 / 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

20 / 25

Most of the digestion and absorption of the food occur in the:

Small intestine

Liver

Stomach

Large intestine

21 / 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

22 / 25

The organ of the circulatory system in humans.

Veins

Nose

Lungs

Kidney

23 / 25

The red pigment which carries oxygen in the blood.

Haemoglobin

Platelets

Veins

Capillaries

24 / 25

If human urine is allowed to stand for sometime, it smells of ammonia, why?

Urea present in urine gets decomposed into ammonia by the action of bacteria

Urea present in urine gets decomposed into ammonia by the action of virus.

Urea present in urine gets composed into ammonia by the action of bacteria

none of these

25 / 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

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CBSE Class X – Science Biology Exam ( Full Syllabus)

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