Which of the following is not true ?

Options

A. population tends to grow in geometrical progression
B. J-shaped growth curve has only two phases
C. There are more females than males in India
D. Father is biologically respeonsible for the sex of the child.

Answer

To determine which statement is not true, we will analyze each statement one by one:

1. **Population tends to grow in geometric progression**:
- This statement is true. Thomas Malthus proposed that populations grow exponentially (or geometrically) when resources are abundant and there are no limiting factors. This means that under ideal conditions, the population can increase rapidly.

2. **The J-shaped growth curve has only two phases**:
- This statement is also true. The J-shaped growth curve represents exponential growth and consists of two main phases: the lag phase (where the population is establishing itself) and the exponential growth phase (where the population grows rapidly). It does not include a stationary phase.

3. **There are more females than males in India**:
- This statement is not true. In India, the male population is generally higher than the female population. This is supported by demographic studies and census data.

4. **The father is biologically responsible for the sex of the child**:
- This statement is true. The sex of a child is determined by the chromosomes contributed by the parents. The mother contributes an X chromosome (XX), while the father can contribute either an X or a Y chromosome (XY). If the father contributes a Y chromosome, the child will be male; if he contributes an X chromosome, the child will be female.

**Conclusion**: The statement that is not true is "there are more females than males in India."