Respiration in Organisms — Science STD 7 — Question

During a field trip, some students visited an agricultural farm and saw a few birds eating earthworms. They enjoyed the scene and then they also started picking and killing the earthworms for pleasure. Seeing the crowd of students in a corner, the teacher rushed to them to see the matter and objected to their action. Anshul, one of the student asked the reason. Teacher smiled and explained him that an earthworm living in the soil is very beneficial for farmers. Anshul wondered whether there were other organisms also in the soil. The teacher appreciated him and explained.

1. Mention the importance of earthworm.
2. List some organisms living in soil.
3. What are the values shown by Anshul?

Explain weathering of rocks.

Define light. Name three important properties of light.

Observe the given figure?

1. Which plant is this? Give the name of the plant.
2. What does it shows?
3. From where the new plants are developing?

When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.

Figure shows a part of a forest.


Write any three activities going on in the forest on the basis of this figure.

How does the process of fertilisation take place in flowers?

How does chewing food properly help in digestion?

Why do we get instant energy from glucose?