PART - 1 - Unit III : CH - 9 Biomolecules — BIOLOGY STD 11 Science — Question

Explain the chemical events that take place to form a blood clot to seal the wound.

A sample of urine was diagnosed to contain high content of glucose and ketone bodies. Based on this observation, answer the following:

1. Which endocrine gland and hormone is related to this condition?
2. Name the cells on which this hormone acts.
3. What is the condition called and how can it be rectified?

Define the following:

1. Respiration.
2. Respiratory substrate.
3. How does a tree trunk exchange gases with the environment although it lacks stomata?
4. Which is the most important energy carrier? Is this compound mobile?
5. Name the major respiratory substrates used by most organisms. It unavailable at time, what other substances can be used for respiration?

In the biology class, one of the student named Atul asked the importance of biologicalclassification. The biology teacher explained that it was required by the taxonomists for the better understanding of living world in systematic and simplest manner.

1. Explain the term biological classification.
2. What is its need?
3. What are the objectives of biological classification?
4. What are the values shown by Atul?

Explain the association of carbohydrate to the plasma membrane and its significance.

Distinguish between blind spot and yellow spot.

A milkman is very upset one morning as his cow refuses to give any milk. The milkman’s wife gets the calf from the shed. On fondling by the calf, the cow gave sufficient milk. Describe the role of endocrine gland and pathway associated with this response?

Prakhar, a class XI student went out after rains in the garden. He saw earthworms on the ground and wondered how they are able to move, eat and perform various function of life Next day, he went to his biology teacher and asked her about the same. Her biology teacher politely explained him about how different animals have various levels of organisation of cells. She also told her that except sponges and coelenterates, all the animals of the kingdom-Animalia have organ- system level of organisation.

1. What kind of body organisation are present in sponges and coelenterates?
2. Write about the organisation type in lower animals, like protozoans.
3. In which phylums organ system level organisation is found?
4. What values are shown by Prakhar?

Frogs are beneficial for mankind, justify the statement.