MODEL PAPER 8 — 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.

Differentiate between an Insect and Spider.

A rubber band stretches and reverts back to its original position. Bubble gum stretches, but it would not return to its original position.
Is there any difference between the two processes? Discuss it with respect to plant growth (Hint: Elasticity (reversible) Plasticity (irreversible))

Every nutrient comes from the abiotic component of the ecosystem. These nutrients are converted by green plants into useful substances and finally go to other living beings through the food chain. Finally, after the death of plants and animals; decomposers send them back to the environment. Thus the balance of various components of the ecosystem is maintained. In your view which of the following is the correct approach? What is the importance of balance of ecosystem for us?

1. We should protect the ecosystem so that its balance is maintained.
2. We should enjoy our life and let the nature do its job of maintaining the balance in the ecosystem.

Explain different layers of arteries.

Give a diagrammatic representation of lowering of activation energy by enzyme.

Write short notes on:

1. Kingdom Plantae.
2. Kingdom Animalia.
3. Bacteria.
4. Lichens.

Observe the given figure and answer the 983 following questions.

1. State the nature of solution mark (1).
2. What process has been depicted in figures C to D?
3. What will be present in the space marked as (2)?
4. In which figures turgor pressure will be zero?
5. In which figures wall pressure will be positive?

Mention the basis of a (biological) classification. What educative advantage do we get from r botanical garden and r zoological park?