Question

The given figure shows development of an embryo that undergoes two phases A and B. Select the correct option regarding it.

• A. A - Geometric phase, B - Arithmetic phase
• B. A - Arithmetic phase, B - Geometric phase
• C. A - Arithmetic phase, B - Exponential phase
• D. A - Exponential phase, B - Stationary phase

Answer 1

Answer: (A)

A - Geometric phase, B - Arithmetic phase
In the figure the zygote undergoes mitotic division, in the initial stage or thestage every progeny cell retains its capacity to divide and form progeny cells here no cells are undergoing differentiation. So, here the division occurs in $2^n$ manner. - growth in unicellular organisms and certain higher plants.

The graph plotted here is exponential gradually moving to sigmoid.

In stage B not all the progeny cells retain their capacity to divide some stop division and undergo differentiation. So, here the division occurs as 2,4,6,8... that is in an arithmetic progression. Example growth in root and stem.

The graph plotted here is linear

So, the correct answer is 'A - Geometric phase, B - Arithmetic phase'