CBSE Class 7 Science Biology Worksheet

Q A Fill in the blanks using suitable words:

1 The largest gland in human body is _________.

2 ________ is the pigment present in RBC of human blood.

3 ______ is surrounded by two guard cells.

4 Rate of photosynthesis is equal to the rate of respiration during - __________ light.

5 Breathing rate of a rat is ________ times per minute.

Q B Answer the following questions in brief:

1 What are the functions of the tongue?

2 Name any two plants that shows heterotrophic mode of nutrition.

3 Differentiate between arteries and veins giving 2 points of differences.

4 Name the respiratory organ of a man and a fish respectively.

Q C Give scientific reasons for the following:

1 Ruminant bring back cud into their buccal cavity.

2 Mucor shows heterotrophic mode of nutrition.

3 We should not sleep under the tree during night time.

Q D Answer the following questions in detail with the help of diagram.

1 Draw a neat and well labeled diagram of human digestive system and explain the process of absorption in detail.

2 Explain the process of respiration in a grasshopper with the help of a well labeled diagram.