141.

Which one of the following can be used to form a virtual and magnified image of an object?

• Both the convex mirror and convex lens

• Only convex lens

• Both concave mirror and convex lens

• Only concave lens

Select from the following a set of ruminants

• Buffalo, cow, deer

• Cat, buffalo, deer

• Buffalo, cow, dog

• Cow, deer, dog

Study the following statements about villi (singular villus).

1. They have very thin walls.
2. They are finger-like projections.
3. They have a network of thin and small blood vessels close to the surface.
4. They have small pores through which food can easily pass.

Identify the statements which give the characteristics that enable the villi to absorb the digested food.

• C and D

• B and D

• A, B, and C

• A and B

An object of mass 6 kg is sliding on a frictionless horizontal surface with a uniform speed of 3 m/s. The force required to keep the object moving at the same speed along the same straight line is

• 27 newton

• 18 newton

• 54 newton

• zero newton

Which one of the following elements must be available in sufficient quantity in the water of a pond in at tadpoles are growing?

• Oxygen

• Iodine

• Nitrogen

• Chlorine

In human beings, the correct sequence of the events during reproduction is

• zygote, gamete formation, fertilisation, embryo

• gamete formation, fertilisation, zygote, embryo

• gamete formation, zygote, fertilisation, embryo

• gamete formation, fertilisation, embryo, zygote

Consider the following terms related to cells.

1. Chromosome
2. Gene
3. Nucleolus
4. Ribosome

Out of these, the parts of the nucleus of a cell are

• C and D

• B and C

• A, B, and C

• A and C

Tartaric acid is found in

1. Lemons
2. Amla
3. Unripe mangoes
4. Grapes

• A and B

• B and C

• C and D

• A and C

Consider the following statements about biodiversity.

1. It refers to the total number of individuals of a particular species living in an area.
2. It refers to only the flora and fauna of a particular species in a given area.
3. It refers to the various (variety of) species of flora and fauna present in an area.
4. It is an artificially protected area for animals.

The true statement(s) about biodiversity is/are

• A, B, and C

• Only C

• A, C, and D

• A and B

When a body falls freely

• its PE is converted into KE

• its KE is converted into PE

• its mechanical energy is converted into heat energy

• None of the above