From where do humans obtain their food?

2

(a)

While preparing idli, what major ingredients are used?

2

(a)

Name two plant food items which provide proteins.

2

(a)

Name the problems which occur due to lack of proteins.

2

(a)

What is dehydration? Does body weight of person increase or decrease when suffering from dehydration?

2

(a)

Name two fibres which are obtained from the stems of plants.

2

(a)

Do liquids dissolve in water?

2

(a)

Write one purpose of separating substance from a mixture.

2

(a)

Write the steps involved in distillation.

2

(a)

Write the changes that can be noticed in our body easily.

2

(a)

Leaves are modified to form a special structure to give support to the plant. Name that modification.

2

(a)

Why is the upper part of the human ear not soft as the lower part or the earlobe?

2

(a)

Explain how did people know how far they have travelled.

2

(a)

Which form of energy enables us to see the things around us?

2

(a)

Does the magnet with iron filings sticking to it look like a bar magnet?

2

(a)

Name two main processes which transfer water present on the earth into water vapour continuously.

2

(a)

Why is water essential for plants ?

2

(a)

Do you know the name of gas in atmosphere used in the soft drink bottles?

2

(a)

Name a kind of fuel which is made by decomposition of organic waste.

2

(a)

Why should animal products not be used in vermi-composting ?

2

(a)