Plant Kingdom — BIOLOGY STD 11 Science — Question

Sporozoans are parasitic protozoan protists which lack locomotory organelles atleast in trophozoite stage.

1. Where are they found?
2. What kind of nutrition they have?
3. Do they have nucleus?
4. What is the mode of reproduction?
5. List any four examples of sporozoans.

What is meant by development in plants? Represent schematically the processes in the development of a plant cell.

Compare the following :
Resting potential and action potential.

Nutan's grandfather read in the newspaper that, for predicting the identity of criminals or for deciding the controversies regarding biological parents of the child, court always asks for DNA test. He wanted to know the procedure behind it. So, asked Nutan about DNA as she was studying biology in class XI. She replied that it is a substance present in the cells of living organisms which store the information about an individual.

1. According to you, what is DNA? And what percentage of DNA varies from one individual to the other?
2. What are the main constituents of DNA?
3. Why are biologists interested in studying human genome?
4. What values are reflected from Nutan's grandfather behaviour?

Which of the following would have a rich biodiversity; a metropolitan city; like Mumbai or a village in the hills of Meghalaya?

1. Give reasons in support of your answer.
2. Suggest some ways to maintain or enrich biodiversity in your neighbourhood.

Compare mitral valve and semilunar valve.

Where are calcium ions stored in a muscle fibre? How do calcium ions affect the process of muscle contraction?

OR

Bring out the role of calcium ions and ATP in muscle contraction.

What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?

Give a diagrammatic representation of ATP synthesis.

What is osteoporosis? Why are women at a greater risk of suffering from osteoporosis? Suggest some precautionary means to avoid osteoporosis.