161
We should reduce the use of the plastic bags, bottles etc. because:
Answer: They are non-biodegradable
Questions
162
Every food chain in the ecosystem begins with………. which are the original source of food.
Answer: Producers
163
If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be:
Answer: 1 J
164
The substance which is chiefly responsible for the depletion of ozone layer is:
Answer: CFCs
166
Which of the following does not lead to the depletion of groundwater?
Answer: Process of afforestation
168
A chemical reaction does not involve:
Answer: Changing of the atoms of on element into those of another element to form new products
169
Sometimes we get painful cramps in our leg muscles after running for a long time due to the accumulation of:
Answer: Lactic acid
170
The plant hormone which triggers the fall of mature leaves and fruits from the plant body is:
Answer: Abscisic acid
