Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Ria went to see the zoo in her town with her parents and saw many wild animals, their food habits, behaviour, etc. She saw that there was a wide variety of animal life in the zoo. But she was amazed to see that the board placed in front of lion cage and monkey place which tells that both were mammals. However, she thought that they were totally different in appearance.

1. Why lions and monkeys are considered to be mammals?
2. Explain the scientific reason to maintain a zoological park.
3. Is there any similar place to see a variety of plants? If any, then name some.
4. What values are shown by Ria?

Draw a diagram of alimentary canal of cockroach and label any six parts in it. (Description is not required)

1. Draw a neat labelled diagram of the vertical section of a maize grain.
2. Why can we not use the term seed for maize grain?

What are meristems? How does the primary growth differ from that of secondary growth?

What is the nature of cell-walls in diatoms?

Why earthworm is called the friend of farmer?

Write two names for each of the following:

1. Free-living, nitrogen-fixing cyanobacteria.
2. Free-living, aerobic, nitrogen-fixing bacteria.
3. Symbiotic, nitrogen-fixing bacteria.

Name any three disorders related to bones/ skeletal system and describe them.

The biology teacher asked the students to verify the Pavlov's experiment in dogs to establish the conditioned response (reflex). The class was divided into two groups. The teacher asked them to submit the reports. Group 2 did not repeat the experiment. The teacher praised group 1 and also gave another chance to group 2 students.

1. Which experiment was performed by students?
2. Explain the experiment in brief.
3. What is conditioned reflex?
4. What values did group 1 exhibit?

Study the curve given below and answer the questions asked:

1. What is this curve known as?
2. What does 'C' depict in the curve?
3. The effect of which factors can be studied with the help of this curve?