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

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?

purple

green

red

no color

2 / 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

3 / 25

A woman has only daughters which

Indicates that in every fusion, the sperm carrying the Y chromosome fertilized the ovum.

Indicates that in every fusion, the sperm carrying the X and Y chromosome fertilized the ovum.

Indicates that in every fusion, the sperm carrying the X chromosome fertilized the ovum.

Both 1 & 3

4 / 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

5 / 25

Exchange of genetic material takes place in:

Vegetative reproduction

Asexual reproduction

Sexual reproduction

Budding

6 / 25

A trait in an organism is infuenced by:

Paternal DNA only

Maternal DNA only

Both maternal and paternal DNA

Neither paternal nor maternal DNA

7 / 25

If the fossil of an organism is found in the deeper layers of earth, then we can predict that:

The extinction of the organism occurred recently

The extinction of the organism occurred thousands of years ago

The fossil position in the layers of Earth is not related to its time of extinction.

The time of extinction cannot be determined.

8 / 25

In peas, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plants to pure short plants in F2 generation will be:

1 : 3

3:01

1:01

2:01

9 / 25

The length of pollen tube depends upon the distance between:

Pollen grain and upper surface of stigma

Pollen grain on upper surface of stigma and ovule

Pollen grain in anther and upper surface of stigma

Upper surface of stigma and lower part of style

10 / 25

Which among the following diseases is not sexually transmitted?

Syphillis

Hepatitis

HIV-AIDS

Gonorrhoea

11 / 25

Assertion (A): Variation is useful for the survival of species over time. Reason (R) : Populations of organisms fill well-defined places in the ecosystem, using their ability to reproduce

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

12 / 25

The site of fertilization of the ovum takes place is

Ovaries

Fallopian Tube

Callopian Tube

None Of These

13 / 25

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

Tubectomy

Vasectomy

Both 1 & 2

None Of These

14 / 25

A surgical method of Blocking vas deferens to prevent pregnancy is done for

Females

Males

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

Total number of chromosomes present in human beings are

46

23

24

48

17 / 25

Which part of alimentary canal collects bile from the liver?

Stomach

Small intestine

Large intestine

Oesophagus

18 / 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

19 / 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

20 / 25

In which of the following vertebrate groupȰ groups, does heart not pump oxygenated blood to diferent parts of the body?

Pisces and amphibians

Amphibians and reptiles

Amphibians

Pisces only

21 / 25

In the list of organisms given below, those that reproduce by the asexual method are:

Banana

Dog

Yeast

Amoeba

22 / 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

23 / 25

The xylem in plants are responsible for

Transport of water

Transport of food

Transport of amino acids

Transport of oxygen

24 / 25

The organ of the circulatory system in humans.

Veins

Nose

Lungs

Kidney

25 / 25

Human skin is impermeable to gas because

to minimise the loss of water from the skin

to maximise the loss of water from the skin

to minimise /maximise the loss of water from the skin

none of these

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CBSE Class X – Science Biology Exam ( Full Syllabus)

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