Botany Interview Questions and Answers on “Growth and Development in Plants – 2”.
1. Which of the following is not the characteristics of the cells of the phase of elongation?
a) Increased vacuolation
b) Cell enlargement
c) Plasmodesmatal connections
d) Cell wall deposition
Answer: c
Clarification: Plasmodesmatal connections are not the characteristic cells of the phase of elongation, rather they represent the cells of the meristematic phase of growth. Some characteristics of the cells of the phase of elongation include increased vacuolation, cell enlargement and new cell wall deposition which gives strength to the existing cell wall.
2. Which zone lies next to the phase of elongation?
a) Phase of maturation
b) Meristematic zone
c) Zone of enlargement
d) Root cap
Answer: a
Clarification: Phase of maturation lies next to the phase of elongation. This phase lies away from the root apex and is formed last in the growth of the root of the plant.
3. Which of the following is a characteristic of the cells of the maturation zone?
a) Thin-walled
b) Thick-walled
c) Enlarged cells
d) Plasmodesmatal connections
Answer: b
Clarification: The cells of the maturation zone, attain their maximal size in terms of wall thickening and protoplasmic modifications. From this region, some of the epidermal cells form very fine and delicate, thread-like structures called root hair.
4. What is the growth rate?
a) Increased growth per unit distance
b) Decreased growth per unit distance
c) Increased growth per unit time
d) Intermediate growth between time and distance
Answer: c
Clarification: The increased growth per unit time is termed as growth rate. Thus, the rate of growth can be expressed mathematically and can be represented with the help of various charts and graphs.
5. The growth rate is generally of how many types?
a) One
b) Two
c) Four
d) Five
Answer: b
Clarification: An organism or a part of the organism can produce more cells in a variety of ways. The growth rate shows an increase that may be arithmetic or geometric.
6. Root elongating at a constant rate is an example of arithmetic growth.
a) True
b) False
Answer: a
Clarification: The simplest expression of arithmetic growth is exemplified by a root elongating at a constant rate. On plotting the length of the organ against the time, a linear curve is obtained.
7. How many phases are generally there is a geometric growth curve?
a) One
b) Two
c) Three
d) Four
Answer: c
Clarification: The geometric growth curve has three phases, namely:
i. Lag phase
ii. Exponential or log phase
iii. Stationary phase.
8. Which of the following curves is a characteristic of all living organisms?
a) Hyperbola
b) Straight line
c) Linear curve
d) Sigmoid curve
Answer: d
Clarification: A sigmoid curve is a characteristic of a living organism growing in a natural environment. It is typical for all cells, tissues and organs of a plant.
9. In how many ways the quantitative comparison between the growth of the living system can be made?
a) Two
b) Three
c) Four
d) Five