Plant growth and development practice · Medium

Vernalisation can be reversed by

Choose the correct statement
I. Cytokinin – Delay of leaf senescene
II. Auxin – Apical dominance
III. Ethylene – Seed germination
IV. Gibberellins – Immature falling of leaves

The plant hormone responsible for apical dominance is

Opening of floral buds into flowers, is a type of

Vernalization is done at

I. Antagonist to GA
II. Promoted bud dormancy
III. Promoted stomatal closure
IV. Promoted abscission layer
Identify the hormone/s which promote/s all these events in plants and choose the correct option

Stimulus for vernalisation is perceived by

Effect of photoperiod on growth and development of plants especially on flowering is called

A phytohormone, which increases the production of starch hydrolyzing enzymes during the germination of maize seeds, is employed for the following

The shedding of leaves, flowers or fruits due to change in the hormonal balance in plants, is referred as

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

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

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

In some plants, sleep movement of leaves is due to

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

Geotropic response is perceived by

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

A hormone delaying senescence is

IAA is derived from or which of the following is involved in the synthesis of a plant IAA and vasoconstrides cerotonin?

The problem of necrosis and gradual senescence, while performing tissue culture can be overcome by

Choose odd one out w.r.t. function of one of the most widely used PGR in agriculture i.e. ethylene

Which plant hormone promotes seed dormancy, bud dormancy and causes stomatal closure?

Maximum elongation takes place in