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) : 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

2 / 25

The gene type of green stemmed tomato plants is denoted as GG and that of purple stemmed tomato plants as gg. What colour of stem would you expect in F1 progeny when these two are crossed?

As green stem is a dominant trait as compared to purple stem, the colour of stem would be green in F1 progeny

As green stem is a dominant trait as compared to purple stem, the colour of stem would be Blue in F1 progeny

As green stem is a dominant trait as compared to purple stem, the colour of stem would be violet in F1 progeny

none of these

3 / 25

Newly formed DNA copies

are identical

may not be identical

both 1 & 2

none of these

4 / 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

5 / 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

6 / 25

Select the group which shares the maximum number of common characters

Two species of a genus

Two genera of a family

Two individuals of a species

Two genera of two families

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

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that:

Reptiles have evolved from birds

There is no evolutionary connection between reptiles and birds.

Feathers are homologous structures in both the organisms.

Birds have evolved from reptiles.

9 / 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

10 / 25

The number of chromosomes in parents and offsprings of a particular species remains constant due to: Halving of chromosomes during gamete formation

Doubling of chromosomes after zygote formation

Halving of chromosomes during gamete formation

Doubling of chromosomes after gamete formation

Halving of chromosomes after gamate formation

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

What is the mode of asexual reproduction in Amoeba?

Binary Fission

Fragmentation

Budding

Regeneration Or Budding

13 / 25

What is the mode of asexual reproduction in Spirogyra

Spore Formation

Budding

Binary Fission

Fragmentation

14 / 25

The development foetus takes place in mother’s body from

Ovaries

Embryo

Placenta

Fallopian Tube

15 / 25

Which pollination increases genetic uniformity and decreases variations

Cross Pollination

Self Pollination

Both 1 & 2

None Of These

16 / 25

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

Tubectomy

Vasectomy

Both 1 & 2

None Of These

17 / 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.

18 / 25

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

Small intestine

Liver

Stomach

Large intestine

19 / 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

20 / 25

Which of the following statements about the autotrophs is inapropriate:

They synthesize carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll

They store carbohydrates in the form of starch

They convert carbon dioxide and water into carbohydrates in the absence of sunlight

They constitute the frst trophic level in food chains

21 / 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

22 / 25

The ways in which glucose is oxidized to provide energy in various organisms

Aerobic respiration

Anaerobic Respiration

Aerobic & Anaerobic

none of these

23 / 25

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

Starch

Glucose

Starch & Glucose

none of these

24 / 25

Which of the following is an important component of haemoglobin

calcium

potassium

Sodium

Iron

25 / 25

Name an enzyme present in pancreatic juice

Trypsin

lipase

lipase & Trypsin

none of these

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CBSE Class X – Science Biology Exam ( Full Syllabus)

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