Biomolecules — BIOLOGY STD 11 Science — Question

The number and kinds of organism is not constant. How do you explain this statement?

Give a brief account of viruses with respect to their structure and nature of genetic material. Also name four common viral diseases.

Explain how ATP synthase (complex V) helps in the synthesis of ATP in mitochondria with the help of a diagram.

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.

Mention and explain the special properties of muscle.

Two groups (A and B) or bean plants of similar size and same leaf area were placed in identical conditions. Group A was exposed to light of wavelength 400-450nm and Group B to the light of wavelength of 500-550nm. Compare the photosynthetic rate of the two groups by giving reason.

List out any six general features of cartilaginous fishes.

Respiratory pathway is believed to be a catabolic pathway. However, nature of TCA cycle is amphibolic. Explain.

Write any four differences between mitosis of animal and plant cells.

An Rh-negative woman is carrying an Rh-positive foetus for the second time. Describe the consequences of Rh-incompatibility in this case?

OR

Why is it necessary to check the Rh-factor of the blood of a pregnant woman?