Respiration in Organisms — Science STD 7 — Question

Study the following statements about ozone.
I. It is essential for breathing of living organisms.
II. It is used to disinfect water.
III. It absorbs ultraviolet rays.
IV. Its proportion in air is about 3%.
Which of these statements are correct?
(a) I, II and III
(b) II and III
(c) I and IV
(d) All of the above

In figure, the artist has forgotten to put the labels and directions on the arrows. Mark the directions on the arrows and label the diagram using the following labels

clouds, rain, atmosphere, carbon dioxide, oxygen, plants, animals, soil, roots, water table

List the similarities and differences between aerobic and anaerobic respiration.

Describe the method for replinishing the soils with minerals and other essential constituents used by plants growing in those soil by farmers.

What are synthetic indicators? Name two and describe their use.

Discuss the role of non-metals in medical and agricultural fields.

Write the scientific terms for the following.

1. The level of water under the ground.
2. The process of seeping of water into the ground.
3. The circulation of water on the earth.
4. The wise and judicious use of water.
5. Seeped water that collects between the layers of hard rocks.

How will you help your neighbours in case cyclone approaches your village/ town?

Explain the position and role of the Sun, Moon, and Earth in a solar and a lunar eclipse.