Biological Classification — BIOLOGY STD 11 Science — Question

Distinguish between Shark and Ray.

1. State the function of leghaemoglobin in legume plants.
2. How is ammonia converted into nitrate by the soil bacteria?

Amrita while playing with her friend, near the pond noticed in the pond that a green colour covering is floating on the surface of the water. She discussed this with her friend and both got surprised. Next day in the school Amrita asked her teacher about the same. Teacher told her, that was nothing, but green algae which occur both in fresh and marine water habitats.

1. Mention the economic importance of algae.
2. Why green algae are considered to be the ancestors of all land plants. Justify the statement by giving reasons.
3. What values as a good biology student are reflected from Amrita's character.

Write any four symptoms of Mycoplasma.

What is the role of gall bladder? What may happen if it stops functioning or is removed?

How are tracheids different from vessels found in angiosperms? Give a labelled sketch of each of them.

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?

Analyse the events during every stage of cell cycle and notice how the following two parameters change. Amount of DNA content (C) per cell.

Describe nitrification along with the equations and the organisms involved in each step.

Show the structure of a renal corpuscle with the help of a diagram.