Answers to Check Your Progress

Check Your Progress 1

i. Non-living factors are soil, air, light, heat and moisture. Living factors are neem tree, cow, rose flower, butterfly, human being.

ii. The example is that presence of trees brings moisture to the air and lowers the temperature.

iii.The forest is an example of a terrestrial eco-system and hycinth is an example of an aquatic plant.

Check Your Progress 2

i.Producers,

ii) consumers,

iii) only plants,

iv) other animals,

v) secondary,

vi) tertiary,

vii) both,

vii)decomposers,

viii) primary

Check Your Progress 3

1. b

2. Interrelationships between many food chains in the eco-system make a food web.

Check Your Progress 4

i. The autotrophs or the producers

ii. The second level

iii. Because energy is lost to the environment with each transfer.

Check Your Progress 5

i. a, d and e are true and b and c are false.

Check Your Progress 6

1. Yes, the process may end in a lethal level to consumers.

2. The main problem is that non-biodegradable wastes accumulate progressively at each trophic level and these can’t be removed by washing or other means.

3. c

Check Your Progress 7

1. It will hav a positive impact as there will be lesser amount of pollution in our environment.

2. Yes, one of the easiest things that we can do to reduce our electrical consumption is change out our regular incandescent light bulbs to compact fluorescent bulbs (CFLs). CFLs use 65 to 75 per cent less energy than a normal light bulb that produces the same amoun of light.

3. Yes, we can rcycle paper waste.

4. No, it i not a good idea to burn our garden waste as burning adds to carbon dioxide level in the atmosphere and deprives the plants from receiving organic fertilizer.

5. Yes, children should go to schools located wihin walking distance from their homes because walking will give children some exercise and will not use either private or public transport systems that run on diesel or petrol and cause air and noise pollution.