Animal Kingdom — BIOLOGY STD 11 Science — Question

What is the difference between cell walls of Gram positive and Gram negative bacteria?

List the different types of ribs found in our body. How many pairs of ribs are present in human beings?

Distinguish between: Inspiratory capacity and Expiratory capacity.

The excretory organs of Platyhelminths, are:

1. Nephridia.
2. Flame cells.
3. Nephrons.
4. Kidneys.

Keep some freshly cut flowers in a solution of food colour. Wait for sometime for the dye to rise in the flower, when the stem of the flower is held up in light, coloured strands can be seen inside. Can this experiment demonstrate which tissue is conducting water up the stem?

To which class of Bryophyta Anthoceros belong? Why is it called a hornwort?

If fifty per cent of the leaves are removed from a plant, the rate of transpiration by the remaining leaves increases. Explain.

Write the functions of cerebrospinal fluid.

Where do ultrafiltration, reabsorption and secretion occur in a nephron?

Distinguish between cranial nerves and spinal nerves.