8th Standard Science Chapter-7

Q11. Which of the following radiations is responsible for the conversion of atmospheric oxygen to ozone?

Q12. The substance which is chiefly responsible for the depletion of ozone layer is:

Q13. What will happen if deer is missing in the food chain given below?

Grass → Deer → Tiger

Q14. Which of the following substances will not be converted to compost when added in a composting pit?

Q15. Global warming is a phenomenon related to

Q11. Sardar Sarovar Dam is situated on river:

Q12. Which among the following is a major programme that was started to replenish the damaged forests?

Q13. In our country, there are attempts to increase the height of several existing dams like Tehri and Almati dams across the Narmada. Choose the correct statements among the following that are a consequence of raising the height of dams

i. Terrestrial flora and fauna of the area is destroyed completely

ii. Dislocation of people and domestic animals living in the area

iii. Valuable agricultural land may be permanently lost

iv. It will generate permanent employment for people

Choose the correct option from the following:

Q14. Given below are a few statements related to biodiversity. Pick those that correctly describe the concept of biodiversity

i. Biodiversity refers to the different species of flora and fauna present in an area

ii. Biodiversity refers to only the flora of a given area

iii. Biodiversity is greater in a forest

iv. Biodiversity refers to the total number of individuals of a particular species living in an area

Choose the correct option from the following:

Q15. Which among the statements given below is incorrect?