Plant growth and development practice · Mixed difficulty

Study the following statements
I. ${O_2}$ helps in releasing metabolic energy, which is essential for growth
II. Nutrients are required by plants for the synthesis of protoplasm
III. Change in temperature could be the detrimental for the survival of an organism
IV. Light and gravity don’t affect the stages of growth
Choose the correct option

In organs of plants there is a variation in rate of growth. It is first slow, then accelerated upto maximum and slows down to stand still. The period of vigorous growth is known as

Choose the odd one for L.D.P

Choose the correct statements from the following by considering two leaves $\mathrm{A}$ and $\mathrm{B}$ whose initial sizes are $5 \mathrm{~cm}^2$ and $50 \mathrm{~cm}^2$ respectively and after a period of time their sizes are $10 \mathrm{~cm}^2$ and $55 \mathrm{~cm}^2$ respectively
(A) Their absolute growth rates are equal.
(B) The absolute growth rate of $\mathrm{A}$ is more.
(C) The relative growth rate of $\mathrm{A}$ is more.
(D) The relative growth rate of $\mathrm{B}$ is more.

Increased vacuolation, cell enlargement and new cell wall deposition are the characteristics of cells in ______ phase of growth

The scientist, who performed some experiments
with oat coleoptiles for the presence of a
substance which could diffuse into agar blocks
is

Development includes (plants)
I. Differentiation
II. Redifferentiation
III. Dedifferentiation
Select the right combination from the given option

Assertion (A): Winter varieties off wheat & rye are planted in autumn not in spring.

Reason (R): If winter varieties planted in spring normally they fail to flower or produce mature grain within a span of flowering season.

No correlation is observed between critical photoperiod and induction of flowering response in

In humans, the activation of sympathetic nervous system stimulates the adrenal medulla to release
certain hormones that help in flight and fight response. A similar type of response in plants can be
given by

Gibberellic acid induces flowering

The process of developing permanent cells from meristematic cells which are produced from permanent cells is called as

In some plants, sleep movement of leaves is due to

Growth period of plant is generally divided into

Assertion (A): Vernalisation prevents precocious reproductive development till the plant matures.

Reason (R): Vernalisation leads to reduction in vegetative life of plant.

The plant hormone which counteracts apical dominance is

A primary root grows from 5 cm – 19 cm in a week. Calculate the relative growth rate over the period (1 day)

Which of the following is the effect of a plant hormone, which is synthesized more in the absence of light?

Decapitation usually results in the growth of

Geotropic response is perceived by

Most widely used compound as a source of ethylene is

Increased growth per unit time is termed as

Assertion : The apical bud is the only source of
auxins.

Reason : Removal of apical bud promotes lateral
bud growth.

Assertion : Dark period plays more important
part in flowering than light period.

Reason : Flowering occurs in short-day plant if
the dark period is interrupted by light break.

Which of the following processes is concerned with Cholodny-Went theory?

Study the following statement
I. Cytokinins are formed primarily in roots
II. Auxin and cytokinin are antagonistic in apical dominance
III. Kinetin (a modified DNA purine) was discovered from herring sperm
IV. Zeatin is auxin
V. Zeatin was firstly extracted from herring
Choose the incorrect one

Assertion(A): Phototropism in plants is caused by auxin
Reason(R): The plant sbowing bending has more elongated cells on the illuminated side

Photoperiodic stimulus is received by

A hormone delaying senescence is

I. Kinetin is a degradative substance from DNA
II. ABA is present in all plants including lower plants
III. Low ratio of cytokinin to auxin favours root formation only
IV. ABA is synthesised catabolically through glycolysis pathway
Choose the correct combination of options