Biological Classification — BIOLOGY STD 11 Science — Question

Answer briefly: What are the basic layers of the wall of alimentary canal?

Double fertilisation is an unique event to angiosperms. Explain the event and its possible significance.

Neha planned to go the lakeside for picnic with her friends. Suddenly they noticed a man drowning in the lake. Everyone was frightened, but Neha asked them to stop panicking and take the man out of water. After the man was rescued, he was found unconscious. Neha then suggested that mouth to mouth artificial respiration should be given to save the man. One of her friend did as she guided.Finally, the man was saved. He thanked Neha and her friends for their help.

1. Why is artificial respiration given?
2. Can artificial respiration bring back a person to consciousness even after death?
3. What values are shown by Neha?

What do you understand by binomial system? Please clarify by example.

What is the principle underlying the use of cyanobacteria in agricultural fields for crop improvement?

Explain the functional significance of lymphatic system?

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

Which of the following would have a rich biodiversity; a metropolitan city; like Mumbai or a village in the hills of Meghalaya?

1. Give reasons in support of your answer.
2. Suggest some ways to maintain or enrich biodiversity in your neighbourhood.

Examine the following diagram and answer the following questions:


i. What is the diagram representing?
ii. When point A becomes permeable to Na¹, what change occurs in the polarity of the membrane.
iii. What is the potential difference at point A called ?

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?