Digestion and Absorption — BIOLOGY STD 11 Science — Question

Trachea of cockroach and mammal are similar in having:

1. Paired nature.
2. Non-collapsible walls.
3. Ciliated inner lining.
4. Origin from head.

In which part of the alimentary canal major absorption of digested food takes place? What are the absorbed forms of different kinds of food materials?

Define meiosis. Describe the leptotene phase.

How do some protozoans maintain osmotic pressure?

Draw the diagram of a sarcomere of skeletal muscle showing different regions.

In Opuntia the stem is modified into a flattened green structure to perform the function of leaves (i.e., photosynthesis). Cite two other examples of modifications of plant parts for the purpose of photosynthesis.

Differentiate between. Inspiratory and expiratory reserve volume.

Given below are the pairs of cell organelles and their functions. Which out of these is not a matching pair and why?

1. Mitochondria: Produce cellular energy in the form of ATP.
2. Golgi apparatus: Site of formation of glycoproteins and gloycolipids.
3. Smooth endoplasmic reticulum: The major site for synthesis of lipid.
4. Centrosome: Trap light energy for photosynthesis.

Write a note on the usefulness of algae.

In tropical rain forests, the canopy is thick and plants growing below receive filtered light. How are they able to carry out photosynthesis?