Phases of growth and growth rates — practice questions

Question 1 · difficulty L2 · understanding

In a growing root, which zone contains cells undergoing the most active mitotic division?

• A. Meristematic zone
• B. Zone of maturation
• C. Root-hair zone
• D. Fully differentiated zone

Question 2 · difficulty L3 · understanding

Which one of the following is not a characteristic of plant cells in the phase of elongation?

• A. New cell wall deposition
• B. Cell enlargement
• C. Increased vacuolation
• D. Large conspicuous nuclei

Question 3 · difficulty L3 · understanding

Which of the following statements is not correct ?

• A. Phase of cell elongation of plant cells is characterized by increased vacuolation.
• B. Cells in the meristematic phase of growth exhibit abundant plasmodesmatal connections.
• C. Plant growth is generally determinate.
• D. Plant growth is measurable.

Question 4 · difficulty L3 · understanding

Which one of the following plants does not show plasticity?

• A. Cotton
• B. Coriander
• C. Buttercup
• D. Maize

Question 5 · difficulty L3 · understanding

Plants follow different pathways in response to environment of phases of life to form different kinds of structures. This ability is called

• A. Maturity
• B. Elasticity
• C. Flexibility
• D. Plasticity

Question 6 · difficulty L3 · application

A plant organ increases by the same absolute amount during each equal time interval. Which pattern is this?

• A. Geometric growth
• B. Arithmetic growth
• C. Exponential decay
• D. Photoperiodism

Question 7 · difficulty L3 · application

A group of actively dividing plant cells doubles repeatedly while resources remain abundant. Which pattern best fits this phase?

• A. Zero growth
• B. Arithmetic growth
• C. Geometric growth
• D. Vernalisation

Question 8 · difficulty L5 · analysis

Plant A grows from 2 g to 4 g, while Plant B grows from 20 g to 24 g in the same period. Which comparison is correct?

• A. Both have identical absolute and relative growth
• B. A has greater absolute and relative growth
• C. B has greater relative growth only
• D. B greater absolute; A greater relative