Secondary School (English Medium) (5 to 8) कक्षा ७ - CBSE Question Bank Solutions for Science

List five products we get from forests.

The insects, butterflies, honeybees and birds help flowering plants in ______.

A forest is a purifier of ______ and ______.

Herbs form the ______ layer in the forest.

The decaying leaves and animal droppings in a forest enrich the ______.

Explain why there is a need of variety of animals and plants in a forest.

In the 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.

Which of the following is not a forest product?

Which of the following statements is not correct?

Micro-organisms act upon the dead plants to produce.

Cleaning of water is a process of removing ______.

Cleaning of water is a process of removing ______.

How would you test the presence of starch in leaves?

HCl, HNO₃, C₂H₅OH, C₆H₁₂O₆ all contain H atoms but only HCl and HNO₃ show acidic character. Why?

When you place a natural fibre in a flame it ______.

Complete the crossword given below with the help of clues.

Across

1. Substance used as synthetic wool. (7)
2. A plastic used for making containers and carry bags. (9)
3. Substance made up of large number of smaller molecules. (7)
4. Another name for this compound is artificial silk. (5)

Down

     5. A type of fibre obtained naturally from cocoon. (4)
     6. A synthetic fibre classified as polyester. (8)
     7. A polymer used for making ropes. (5)

Organisms that prepare food for themselves using simple naturally available raw materials are referred to as ______.

In the absence of which of the following will photosynthesis not occur in leaves?

Which of the following statements is/are correct?

1. All green plants can prepare their own food.
2. Most animals are autotrophs.
3. Carbon dioxide is not required for photosynthesis.
4. Oxygen is liberated during photosynthesis.

Choose the correct answer from the options below: