ANSWER THE FOLLOWING QUESTIONS:
EACH QUESTION CARRIES THREE MARKS
1. How is ozone depletion caused? Name the compounds causing it.
2. What is meant by biodegradable waste? Which of the following are
biodegradable? Agriculture residue, plastic, insecticides, sewage.
3. What is being done to avoid ozone depletion? ( Three steps)
4. What is meant by a tropic level? Why do we have a greater number of
organisms at lower levels?