Animal Kingdom — BIOLOGY STD 11 Science — Question

Wish bone of birds is formed from:

1. Pelvic girdle.
2. Skull.
3. Hindlimbs.
4. Pectoral girdle/ clavicles.

Mention the two categories of hypothalamic hormones and their functions. Give one example of each.

All chordates possess:

1. Exoskeleton.
2. Limbs.
3. Skull.
4. Axial skeletal rod of notochord.

Name the hormone and its source which produces changes in the secondary sex organs in human females, to prepare for the anticipated pregnancy.

Mention two conditions under which photorespiration may occur in green plants.

Differentiate between fibrous joints and cartilaginous joints, with an example for each.

Sino-atrial node (SAN) is called the pacemaker of our heart. Why?

Given below are floral formulae of some well-known plants. Identify and write to which plants these belong.

What is Tidal Volume? Find out the Tidal volume (approximate value) for a healthy human in an hour.

Distinguish cytokinesis from karyokinesis.