Animal Kingdom — BIOLOGY STD 11 Science — Question

Differentiate between absorption spectrum and action spectrum.

In some animal groups, the body is found divided into compartments with serial repitition of at least some organs. This characteristic feature is called.

1. Segmentation.
2. Metamerism.
3. Metagenesis.
4. Metamorphosis.

George comes on a vacation to India from US. The long journey disturbs his biological clock and he suffers from jet lag. What is the cause of his discomfort?

If a patient's ECG reveals an abnormally long delay between the P-wave and the QRS deflection, what does this suggest?

Differentiate between essential and non-essential amino acids.

Name the tissue that performs the following functions:

1. Coagulation.
2. Transmission of message.
3. Clearing dead cells.
4. Haemopoiesis.

Explain the following processes :
Depolarisation of the membrane of a nerve fibre

Describe the various types of placentations found in flowering plants.

Which one of the following in birds, indicates their reptilian ancestry?

1. Scales on their hind limbs.
2. Four chambered heart.
3. Two special chambers crop and gizzard in their digestive tract.
4. Eggs with a calcareous shell.

Sound box of birds is called:

1. Pygostyle.
2. Larynx.
3. Syrinx.
4. Synsacrum.