Locomotion and Movement — BIOLOGY STD 11 Science — Question

What is agglutination? Show the reaction between blood groups with the help of a diagram.

Differentiate between
i. Myogenic heart and neurogenic heart.
ii. Lymphatic capillaries and blood capillaries.

How are gibberellins useful in agriculture to improve productivity. Give any three points in support of your answer.

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

Sunday morning Abhishek and his friends emptied all the overhead tanks belonging to flat owners who were not residing in their apartments for the last few months. On their return, the owners complained about their empty tanks. Some elderly people even spoke against Abhishek and his friends. Abhishek humbly apologised for the inconvenience caused. He explained that water in the tanks had become stagnant and become a breeding ground for mosquitoes which will give rise to malaria. The people appreciated the boys.

1. What values are reflected by Abhishek in the above case?
2. What is the causal agent of malaria and how does it reach human body?
3. How many phases the causal organism undergoes in its life cycle?
4. As an individual what can you do to avoid malaria in your neighbourhood?

Write an account on skeleton of sponges.

Differentiate between single circulation and double circulation; with an example for each.

What is bone marrow? Briefly describe its types.

Hairs in the inner lining of the nasal cavity prevent dust from getting inside the lungs. This is similar to which of the following? Why should we avoid breathing through mouth?

1. Air filters in automobiles prevent dust from getting into the carburetor
2. A sieve is used to filter out impurities from a substance

What is called blood circulation system? How many types are there? Describe each with examples.