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

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

2 / 25

Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria?

Yes

No

It is difficult to say

none of these

3 / 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

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

The maleness of a child is determined by:

The X chromosome in the zygote

The Y chromosome in the zygote

The cytoplasm of the germ cell which determines the sex

Sex is determined by chance

6 / 25

Two pink coloured fowers on crossing resulted in 1 red, 2 pink and 1 white fower progeny. The nature of the cross will be:

Double fertilization

Self pollination

Cross fertilization

No fertilization

7 / 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

8 / 25

Which of the subsiquent is not a direct conclusion that can be drawn from Mendels experiment?

Only one parental trait is expressed.

Two copies of each trait are inherited in sexually reproducing organism

For recessive trait to be expressed, both copies should be identical

Natural selection can alter frequency of an inherited trait.

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

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

Filaments

Hyphae

Rhizoids

Roots

11 / 25

Characters transmitted from parents to ofspring are present in:

Cytoplasm

RIbosome

Golgi complex

Genes

12 / 25

Slides of binary fission in Amoeba and budding in yeast were given for observa group of students. Some of the observations reported by the group are given below:

Cytokinesis was observed in the yeast cell.

A chain of buds were observed in Amoeba.

Single cell of Amoeba and single cell of yeast were undergoing binary fission and budding respectively

Elongated nucleus was dividing to form two daughter nuclei in Amoeba

3 and 4

2 and 3

3

1 and 4

13 / 25

What is the mode of asexual reproduction in planaria?

Spore Formation

Fragmentation

Binary Fission

Regeneration

14 / 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

15 / 25

Tubectomy does not prevent the spread of sexually transmitted diseases.

True

False

Not sure

Don’t know

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

Which part of alimentary canal collects bile from the liver?

Stomach

Small intestine

Large intestine

Oesophagus

18 / 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

19 / 25

A few drops of iodine solution were put on to rice water. The solution turned blue-black in colour. This specify that the rice water contains:

Complex proteins

Simple proteins

Cats

Starch

20 / 25

Select the event that does not materialise in photosynthesis.

Absorption of light energy by chlorophyll

Reduction of carbon dioxide to carbohydrates

Oxidation of carbon to carbon dioxide

Conversion of light energy to chemical energy

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

The red pigment which carries oxygen in the blood.

Haemoglobin

Platelets

Veins

Capillaries

23 / 25

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

2

3

4

6

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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