Question

Assignment 10th Biology Section B( 30-6-21)

1.Which of the following is a non-biodegradable thing?

a) banana peel b)tin can c)cotton d)leather

2. Which of the following components of sunlight is responsible for the formation of ozone in the

stratosphere?

a) infra red rays b)UV Rays c)Visible light d)red light

3. Garbage can be disposed more environment friendly by

a) incineration b)Land filling c)Recycling d)composting.

4. Which of the following is an alternative name for primary consumers?

a)Carnivore b)herbivore c)saprophyte d)Omnivore

5. Which of the following statements remain true with regard to the flow of energy in the

ecosystem?

a) Energy remain steady b) Go on increasing from lower to higher trophic levels

c) Converted from one form to another.d) No energy reaches at higher trophic levels 6.

Decomposition is mainly carried out by

a)Worms b) bacteria c)virus d) flies.

7. Which of the following may be a conclusion of the excessive exposure of humans

to sun’s ultraviolet rays?

i. Peptic ulcers ii. Eye

disease like cataract iii.

Damage to lungs iv. Skin

cancer

(a) (i) and (iv)

(b) (ii), (iii) and (iv)

(c) (ii) and (iv)

(d) Only (iv)

8. If 100 J energy is available at the producer level in a food chain then the energy available

to the secondary consumer will be:

(a) 10 J

(b) 0.1 J

(c) 1 J

(d) 0.01 J
9. What will happen if deer is missing in the food chain given below?

Grass → Deer → Tiger

(a) The population of tiger increases

(b) The population of grass decreases

(c) Tiger will start eating grass

(d) The population of tiger decreases and the population of grass increases 10. Which of the

following substances will not be converted to compost when added in a composting pit? (a)

Waste paper

(b) Fruit and vegetable peels

(c) Human and animal excreta

(d) Plastic bags

11. The gas released by CFC when it comes in contact with UV rays is

a) hydrogen b) nitrogen c) ozone d) chlorine.

12. Which of the following statements about a producer is right?

a) They do not take up carbon dioxide

b) Do not release Oxygen

c) Absorb energy from sun.

d) Depend other organisms for food?

13. Every food chain in the ecosystem begins with………. which are the original source

of food.

a) Saprophytes

b) Parasites

c) Producers

d) consumers

14.We should reduce the use of the plastic bags, bottles etc. because:a) They are not durable b)

They are non-biodegradable

c) They are made of toxic materials

d) They react with the atmospheric gases

15. Among the following choose the correct option which contains only biodegradable items? i.

Wood, paper, PVC

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Answer 1

Answer:

Explanation:

1) (ʙ) ᴛɪɴ ᴄᴀɴ

2) (ʙ) ᴜᴠ ʀᴀʏꜱ

3) (ᴄ) ʀᴇᴄʏᴄʟɪɴɢ

4) (ʙ) ʜᴇʀʙɪᴠᴏʀᴇꜱ

5) (ᴄ) ᴄᴏɴᴠᴇʀᴛᴇᴅ ꜰʀᴏᴍ ᴏɴᴇ ꜰᴏʀᴍ ᴛᴏ ᴀɴᴏᴛʜᴇʀ

6) (ʙ) ʙᴀᴄᴛᴇʀɪᴀ

7) (ᴄ) (ɪɪ) & (ɪᴠ)

8) (ᴄ) 1 ᴊᴏᴜʟᴇ

9) (ᴅ) ᴛʜᴇ ᴘᴏᴘᴜʟᴀᴛɪᴏɴ ᴏꜰ ᴛɪɢᴇʀ ᴅᴇᴄʀᴇᴀꜱᴇꜱ ᴀɴᴅ ᴛʜᴇ ᴘᴏᴘᴜʟᴀᴛɪᴏɴ ᴏꜰ ɢʀᴀꜱꜱ ɪɴᴄʀᴇᴀꜱᴇꜱ

10) (ᴅ) ᴘʟᴀꜱᴛɪᴄ ʙᴀɢꜱ

11) (ᴅ) ᴄʜʟᴏʀɪɴᴇ

12) (ᴄ) ᴀʙꜱᴏʀʙ ᴇɴᴇʀɢʏ ꜰʀᴏᴍ ꜱᴜɴ.

13) (ᴄ) ᴘʀᴏᴅᴜᴄᴇʀꜱ

14) (ʙ) ᴛʜᴇʏ ᴀʀᴇ ɴᴏɴ-ʙɪᴏᴅᴇɢʀᴀᴅᴀʙʟᴇ

15) Qᴜᴇꜱᴛɪᴏɴ ɪɴᴄᴏᴍᴘʟᴇᴛᴇ..!