General
✓✗The period of growth is generally divided into three phases, namely
- lag, death and senescence
- meristematic, elongation and maturation
- division, dormancy and abscission
- germination, flowering and fruiting
General
✓✗During differentiation into tracheary elements, cells
- lose their walls and become a mass of callus cells
- divide repeatedly and remain meristematic throughout life
- develop many chloroplasts and thin cellulosic walls only
- lose their protoplasm and develop lignified secondary walls
General
✓✗A single cell divides geometrically, with both daughter cells dividing every hour. Assuming no cell death, the number of cells after 6 hours is
- 32
- 128
- 12
- 64
General
✓✗In the example of leaves A (5 to 10 cm2) and B (50 to 55 cm2) grown for the same time, which statement is correct?
- B has a higher absolute growth rate, and A and B have the same relative growth rate.
- B has a higher relative growth rate, but both have the same absolute growth rate.
- A and B have the same relative growth rate, and B has the higher absolute growth rate.
- A and B have the same absolute growth rate, but A has a higher relative growth rate.
General
✓✗Given below are two statements.
Statement I: Heterophylly in cotton, coriander and larkspur is an example of plasticity.
Statement II: In buttercup, leaves produced in air and those produced in water differ in shape.
In the light of the above statements, choose the correct answer from the options given below.
Statement I: Heterophylly in cotton, coriander and larkspur is an example of plasticity.
Statement II: In buttercup, leaves produced in air and those produced in water differ in shape.
In the light of the above statements, choose the correct answer from the options given below.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
General
✓✗Leaf P grows from 10 cm2 to 15 cm2 and leaf Q from 20 cm2 to 28 cm2 in the same period. Which statement is correct?
- Both have equal relative growth rates, but Q has the higher absolute growth rate.
- P has the higher absolute growth rate and also the higher relative growth rate.
- Q has the higher absolute growth rate, but P has the higher relative growth rate.
- Q has the higher absolute growth rate and also the higher relative growth rate.
General
✓✗In geometric growth, following mitotic cell division,
- no cell division occurs
- both progeny cells retain the ability to divide
- both progeny cells mature immediately
- only one progeny cell divides
General
✓✗The typical growth curve in plants is
- linear
- sigmoid
- stair-steps shaped
- parabolic
General
✓✗An increase in the length of a root is best measured using
- the number of lateral roots only
- cell sap concentration
- the colour of root hairs
- a scale or ruler marking over time
General
✓✗Auxin was isolated by F.W. Went from the tips of coleoptiles of
- tobacco stems
- maize roots
- rice seedlings
- oat seedlings
General
✓✗Development in plants is under the control of
- only plant growth regulators
- both intrinsic and extrinsic factors
- only the genes of the plant
- only light and temperature
General
✓✗Which of the following is not a use of ethephon?
- Hastening the ripening of tomatoes
- Increasing the length of grape stalks
- Thinning of cotton, cherry and walnut
- Promoting female flowers in cucumber
General
✓✗Match List I with List II.
Choose the correct answer from the options given below.
| List I (growth term) | List II (description) |
| A. Arithmetic growth | I. Total growth per unit time |
| B. Geometric growth | II. Only one daughter cell keeps dividing |
| C. Absolute growth rate | III. Both daughter cells keep dividing |
| D. Relative growth rate | IV. Growth per unit time per unit initial parameter |
- A-I, B-IV, C-II, D-III
- A-II, B-III, C-I, D-IV
- A-II, B-III, C-IV, D-I
- A-III, B-II, C-I, D-IV
General
✓✗Cytokinins oppose the effect of auxins in
- callus formation
- cell division
- xylem differentiation
- apical dominance
General
✓✗The root apical meristem and the shoot apical meristem are responsible for
- secondary growth (increase in girth) of dicots
- formation of annual rings
- primary growth along the axis of the plant
- formation of cork in old stems