Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

A man is admitted to a hospital. He is suffering from an abnormal low body temperature, loss of appetite and extreme thirst. The doctor consoled him and also prescribed brain scan as he suspected, there would be a tumour in his brain.

1. Mention the reason behind the abnormalities of the patient.
2. Which part of the brain would probably show a tumour?
3. Identify the location of hypothalamus.
4. What values of life were reflected by the doctor?

What happens to the respiratory process in a man going up a hill?

Enzymes are proteins. Proteins are long chains of aminoacids linked to each other by peptide bonds. Aminoacids have many functional groups in their structure. These functional groups are, many of them at least, ionisable. As they are weak acids and bases in chemical nature, this ionization is influenced by pH of the solution. For many enzymes, activity is influenced by surrounding pH. This is depicted in the curve below, explain briefly.

In a slide showing different types of cells can you identify which type of the cell may be meristematic and the one which is incapable of dividing and how?

Give a diagrammatic representation of classification of Protista.

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?

Can you identify the correct sequence of taxonomical categories?

1. Species → Order → Phylum → Kingdom
2. Genus → Species → Order → Kingdom
3. Species → Genus → Order → Phylum

What is resting membrane potential? Give the role of sodium-potassium pumps in maintaining it. How does resting potential change into action potential?

Mention the distinctive characters of cyanobacteria.

Why Ginkgo biloba is called living fossil?

Explain how is it useful for horticulturists. What are its important features?  Why horticulturists prefer to grow only male plants?