Explain sigmoid growth curve.

Describe briefly: (a) Arithmetic growth (b) Geometric growth (c) Sigmoid growth curve (d) Absolute and relative growth rates

Describe briefly the digestion of three types of food by the enzymes of pancreas.

Assertion: Sigmoid growth curve consists of four parts. Reason : Lag phase is called as grand phase of growth.

Describe briefly : Absolute and relative growth rates.

Describe briefly the four major groups of Protozoa.

Describe briefly the steps involved in the breeding of new genetic variety of crops.

Describe briefly the method to obtain mercury from Cinnabar. Write the chemical equations for the reactions involved in the process.

Write the principle of working of a potentiometer. Describe briefly, with the help of circuit diagram, how a potentiometer is used to determine the internal resistance of a given cell.

Explain the term "Regeneration" as used in relation to reproduction of organisms. Describe briefly how regeneration is carried out in multicellular organisms like Hydra.