Which cereal-fields have rows of plants?

Which component of food is the major source of energy to our body?

If you have to select a handle made of steel, wood or rubber for your screw driver, which one will you prefer and why?

Define periodic change.

Cartilage provides the shape to our body and also lubrication in movement. Is it true?

Is shadow two dimensional or three dimensional?

What about objects in the classroom?

What is meant by inert gases?

An animal shows inclination towards eating a particular type of food item. What does this indicate?

What is decantation?

Oceans are the biggest sources of water, yet they are not fit for human consumption. Why?

A mineral causes anaemia when it is not present in sufficient concentration. Name this mineral. What are symptoms associated with this disease? Also list few sources of this mineral.

What are vitamins? State the function of vitamin A and C in our body.

Is it right to call the leaf as food factory of the plant? Justify your answer.

A habitat is said to have two supporting components. What are they?

Rajni went to Chennai to visit her friend. She noticed that the climate was very hot and the food available was so different than at home. Coconut is used extensively and rice is included in all meals. Her friend's mother explained these differences to Rajni.
(a) What changes were observed by Rajni in regard with food habits?
(b) Food habits of all places are different. What do you understand by food habits?
(c) List one dish commonly made in South India. Identify its ingredients, and separate plant and animal derived ingredients.
(d) Do you observe any values in Rajni? Name them.

What is composting ? Do you think it is better to use compost instead of chemical fertilizers? Why?