Forests : Our Lifeline — Science STD 7 — Question

Observe the given picture.

1. Label stomach, liver, pancreas, small intestine.
2. Name two organs that secrete digestive juices.
3. Mention the function of the organ that is longest.

What are villi? What is their location and function?

One day, Ramesh’s friend was performing their respective experiments given by their teacher. While sitting in the practical lab instead of performing experiment, Ramesh was playing with his meter scale. All the sudden, he held the scale in his hand and started moving in front of tubelight, then he observed the seven colours of white light. After sometimes, he got scolded by his lab teacher for not performing the experiment.

1. Give the name of phenomenon that leads to the formation of band of seven colours.
2. Name the constituent colours of white light.
3. Mention the values shown by Ramesh here.

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 sea breeze with a diagram.

Explain the reasons behind deforestation.

Soil particles size is an important factor to determine the property of soil. Explain?

State the characteristics of the image formed by a plane mirror.

Draw and colour a picture showing items made from metals and non-metals in your home.