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

The reproductive part of a plant is the ______.

The process of fusion of the male and female gametes is called ______.

Mature ovary forms the ______.

When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

Will the compass needle show deflection when the switch in the circuit shown by figure is closed?

An electromagnet does not attract a piece of iron.

An electric bell has an electromagnet. 

Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.

Mark ‘T’ if the statement is true and ‘F’ if it is false:

Water shortage is a problem faced only by people living in rural areas. (T/F)

Mark ‘T’ if the statement is true and ‘F’ if it is false:

Rain is the ultimate source of water. (T/F)

You have been asked to maintain a garden. How will you minimise the use of water?

Which one of the following is not responsible for water shortage?

Why should oils and fats be not released in the drain? Explain.

Spot as many organisms as possible in the puzzle given as Figure by encircling them as shown. Write the names on a sheet of paper and categorise them into autotrophs and heterotrophs. Classify the heterotrophs into herbivores, carnivores, omnivores and saprophytes.

The swallowed food moves downwards in the alimentary canal because of ______.

Given below are some adaptive features of animals:

1. Layer of fat under the skin
2. Long, curved and sharp claws
3. Slippery body
4. Thick white fur

Which of them are the adaptive features of a polar bear?

“A fish dies when taken out of water whereas a wall lizard will die if kept under water.” Mention the term used to describe such abilities that allow fish and lizards to survive in their respective habitats.

Write two common adaptive features of a polar bear which help in keeping it warm.

Read the following statement and give the appropriate terms for them.

Accumulation of wastes in the soil generated by human activity which alters the features of soil

Is it a good practice to remove grass and small plants that are growing in an open, unused field? Give reason to support your answer.