Question

you have participarted in a student volunteer program about saving animals and creating an awareness wriye a letter to her about your programme and advising your friend to also enroll for it.

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Answer 1

Explanation:

What happens to the size of pupil of our eye in a bright light? 1

2. How are hermaphrodite animals unique with respect to other animals?

Or

Embryogenesis in mammals is perfect example of vivipary. Comment.

1

3. A vibrating body has a frequency of 10Hertz(Hz).It means that the body is performing

(a) 1 vibration per minute (b) 10 vibrations per minute

(c) 60 vibrations per minute (d) 600 vibrations per minute

1

4. A convex lens acts as a magnifying lens when object is placed at

(a) Focus (F) (b) Beyond centre of curvature (C)

(c) At centre of curvature(C) (d) Between focus (F) and optical centre(O)

Or

Which phenomenon is responsible for Twinkling of stars

(a) Atmospheric Reflection (b) Dispersion

(c) Atmospheric Refraction (d) Absorption

1

5. What are the two properties that make a metal a suitable choice to use as a wire in electrical

appliances?

(a) Conductivity, lustre

(b) Malleability, ductility

(c) Conductivity, ductility

(d) Malleability, Tensile strength

1

6. Which one of the metal is highly reactive when exposed to oxygen and water?

a) Iron b) Gold

c) Copper d)Sodium

Or

Two of the metals that cannot be stored either in air, or under water are

a) Sodium and Magnesium b) Magnesium and Calcium

c) Calcium and Potassium d) Potassium and Sodium

1

7. Which of the following is not true for human liver cell?

a) Ribosome helps in synthesis of protein in liver cell

b) It contains water and minerals in its large vacuole

c) It has flexible cell membrane

d) It has mitochondrion which helps to release A