4. On a very cold morning, Bobby and Priya were talking with each other
to their school. They observed that the air coming out of their mouth looked like smoke
They were assumed and wondered how it happened. Help them to find the answer.
5. Insects and leaves of a plant have pores through which they exchange geses with the
atmosphere. Can you write two points of differences between these pores with respect to
their position, number and extension into the body?
6. After we work hard or perform physical activity, we feel hungry. Explain why.
7. Observe the given figures carefully and answer the following questions
(a) The amount of CO2 is the highest in which jar. Why?
(b) The amount of CO2 is the lowest in which one and why?
Mice
Mice
B
Answers
Answer:
4.On a cold day, the warm and moist air exhaled by us condenses into mist when it comes in contact with the cold air of the atmosphere. This looks like white smoke.
5.Spiracles are present on the sides of insects' body while stomata are present on the lower surface of leaves. Spiracles are fewer in number as compared to stomata. Spiracles lead to an extensive network of tracheal system which is absent in the leaves.
6.You're supposed to be hungry after you work out. Exercise burns calories, uses up your glycogen stores and stimulates your appetite. It also dehydrates you and if you don't drink enough water before, during and after your workout, you're going to feel hungry.
7.figure in not there.....
1.Jar C will be the highest amount of CO2.
There are mice in jar C. They breathe out carbon dioxide. So,CO2 will increase in Jar C.
2.n the case of Jar B, the amount of CO2 would not vary that much because the amount of CO2 consumed by the plant would be released by mice.
Explanation:
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