M.C.Q. [1 M]

MCQ 11 Mark

Which of the following is the high milk yielding variety of a cow?

A
Red sindhi
✓
Holstein
C
Dorset
D
Sahiwal

Answer

Correct option: B.

Holstein

(b) Holstein
Explanation: Holstein Friesians is a breed of dairy cattle originating from the Dutch provinces of North Holland and Friesland,

and Schleswig-Holstein in Northern Germany and Jutland. They are known as the world's highest-production dairy animals.

On an average Holstein Friesian (HF) cow gives 10,000-12,000 litres of milk in a 10-month lactation cycle, whereas the yields

from a desi cow are only 3,000-3,600 litres.

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MCQ 21 Mark

Which of the following settles down when allowed to stand undisturbed doe sometimes?

A
Copper sulphate solution
B
Blood
✓
Muddy water
D
Solution of egg albumin in water

Answer

Correct option: C.

Muddy water

(c) Muddy water
Explanation: Muddy water will settle down because particles are heavy and settle due to gravity. Setting down of coarse

particles under the influence of gravity is called sedimentation. During sedimentation, heavier particles settle down faster than finer particles.

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MCQ 31 Mark

A student added only two drops of iodine to a rice extract in test tube 'A'. Another student added a little rice extract to iodine solution in test tube 'B'. They would then observe:

A
no change of colour in any test tube
✓
a change of colour to blue-black in both tubes 'A' and 'B
C
a change of colour to blue-black in test tube 'B' but not in test tube 'A
D
a change of colour to blue-black in test tube 'A' but not in test tube '

Answer

Correct option: B.

a change of colour to blue-black in both tubes 'A' and 'B

(b) a change of colour to blue-black in both tubes 'A' and 'B
Explanation: Iodine + Starch Solution $\rightarrow$ Blue-black colour
Starch act as an indicator of the presence of iodine.

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MCQ 41 Mark

Plant cell does not burst in a hypotonic solution because__________.

A
Its cell sap is rich in cellulose
B
Its cell sap is more concentrated
✓
Its cell wall resists bursting
D
It does not have lysosomes

Answer

Correct option: C.

Its cell wall resists bursting

(c) Its cell wall resists bursting
Explanation: Cell wall exerts a pressure on the cytoplasm in the opposite direction. It prevents bursting of the cell in a hypotonic solution and limits endosmosis to a certain extent.

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MCQ 51 Mark

Those organs of the body like oral cavity, esophagus, etc., which are subjected to mechanical abrasions are lined by

A
stratified cuboidal epithelium
B
simple squamous epithelium
C
simple columnar epithelium
✓
stratified squamous epithelium

Answer

Correct option: D.

stratified squamous epithelium

(d) stratified squamous epithelium
Explanation: A nonkeratinizing stratified squamous epithelium is found at three prominent sites in the animal body:

i. lining the esophagus,

ii. lining the sides and floor of the oral cavity, and

iii. lining the vagina.

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MCQ 61 Mark

How many electrons are present in the species $He ^{2+}$ ion?

A
2
✓
$0$
C
4
D
8

Answer

Correct option: B.

$0$

(b) $0$
Explanation: Helium (He) has two electrons in its atom. The cation $\left( He ^{2+}\right)$ is formed through the loss of 2 electrons from the outer-most shell of the atom. Hence, the number of electrons in $He ^{2+}$ will be 0 .

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MCQ 71 Mark

What does the slope of the velocity-time graph give?

✓
acceleration
B
force
C
displacement
D
distance

Answer

Correct option: A.

acceleration

(a) acceleration
Explanation: We can find out the value of acceleration from the slope of the velocity-time graph of a moving body.
Acceleration $=\frac{\text { Change in velocity }}{\text { time }}=$ Slope of the velocity-time graph provided.

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MCQ 81 Mark

The level of water in a measuring cylinder before and after a solid of 8 g mass is fully immersed into it as shown. The density of the given solid is:

A
4 g/cm³
B
3 g/cm³
✓
2 g/cm³
D
5 g/cm³

Answer

Correct option: C.

2 g/cm³

(c) $2 g / cm ^3$
Explanation: Density $=\frac{\text { mass }}{\text { volume }}=\frac{8}{9-5}=\frac{8}{4}=2 g / cm ^3$

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MCQ 91 Mark

A nail is inserted in the trunk of a tree at a height of 1 metre from the ground level. After 3 years the nail will

A
move downloads
✓
remain at the same position
C
move sideways
D
move upwards

Answer

Correct option: B.

remain at the same position

(b) remain at the same position
Explanation: When a nail is inserted in the trunk of a tree at a height of 1 metre from the ground, even after 3 year the nail

remains at same level. It does not moves upwards as the apical meristem responsible for growth (length) is present in the apices

only and lateral meristem responsible of increase in girth will lead to no change in length.

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MCQ 101 Mark

What mass of $CO _2$ will $3.011 \times 10^{23}$ molecules contain?

A
4.4 g
B
11.0 g
C
44.0 g
✓
22.0 g

Answer

Correct option: D.

22.0 g

(d) 22.0 g
Explanation: The molecular mass of $CO _2$ is $44(12+26 \times 2)$.

$6.022 \times 10^{23}$ molecules of carbon will contain 44 g .

Hence, $3.011 \times 10^{23}$ molecules of $CO _2$ will contain a mass of 22 g .

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MCQ 111 Mark

The statement 'cells arise only from pre-existing cells' was given by:

A
Louis Pasteur
B
Schwann
C
Schleiden
✓
Rudolf Virchow

Answer

Correct option: D.

Rudolf Virchow

(d) Rudolf Virchow
Explanation: This statement was proposed by Rudolf Virchow in 1855. This theory is called Virchow's theory or Cell lineage theory. This the theory made as a result of objection to the Cell theory.

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MCQ 121 Mark

Bones are connected to muscles at the joints by

✓
tendon
B
adipose tissue
C
areolar tissue
D
Ligament

Answer

Correct option: A.

tendon

(a) tendon
Explanation: The bone is a connective tissue with a hard matrix, composed of calcium and phosphorus. A bone is connected by muscle with connective tissue, called a tendon.

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MCQ 131 Mark

Some species of fish can be cultured in a single fish pond. These fish do not compete for food as they have different food habits. In the following options fish are paired with their food habits. Select the incorrect match.

A
Cirrhinus mrigala - Bottom feeder
B
Labeo rohita - Column feeder
✓
Common carp - Surface feeder
D
Catla catla - Surface feeder

Answer

Correct option: C.

Common carp - Surface feeder

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MCQ 141 Mark

The area under the velocity-time graph gives the value of:

A
velocity
B
acceleration
C
mass
✓
distance travelled

Answer

Correct option: D.

distance travelled

(d) distance travelled
Explanation: The area under a velocity-time graph represents the distance covered and the gradient of a velocity-time graph represents the acceleration.

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MCQ 151 Mark

The proteins and lipids, essential for building the cell membrane, are manufactured by

A
Mitochondria
B
Golgi apparatus
✓
Rough endoplasmic reticulum
D
Plasma membrane

Answer

Correct option: C.

Rough endoplasmic reticulum

(c) Rough endoplasmic reticulum
Explanation: The proteins and lipids, essential for building the cell membrane, are synthesized by the rough endoplasmic reticulum (RER). The ribosomes attached to the RER help in this process.

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MCQ 161 Mark

Look at the following figure and suggest in which of glass container the rate of evaporation will be highest?

A
II
B
I
C
IV
✓
III

Answer

Correct option: D.

III

(d) III
Explanation: The rate of evaporation increases with an increase in surface area because evaporation is a surface phenomenon.

Also, with the increase in air speed, the particles of water vapour will move away with air, which will increase the rate of

evaporation.

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Science M.C.Q. [1 M]

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