Question

Consider the following four statments (a-d) and select the option which includes all the correct once only :-(a) Na pump is an example of active transport.
(b) All living organism are composed of cells so that all cells have similar shape.
(c) The cytoplasm is the main area of cellular activity.
(d) At present time cells are formed denovo from abiotic materials.

• A. Statements a, b and c
• B. Statements a, c and d
• C. Statements b and d
• D. Statements a and c

Answer 1

The correct option is D Statements a and c

1. Sodium pump is an example of active transport as it consumes energy while moving substances against the concentration gradient.

2. All organism is composed of cells each with a shape different from others according to its location and function.

3. The cytoplasm is the main arena of cellular activities in both the plant and animal cells. Various chemical reactions occur in it to keep the cell in the ‘living state’. Though biochemical reactions occur all over a cell, important reactions related to maintaining osmolarity, resting potential (in neurons, muscles and other electrically excitable cells) occur in the cytoplasm - which keeps it 'alive'.

4. Cells are not formed de-novo but from the pre-existing cells.

So, the correct option is 'Statements a and c'.