Polyploidy can be induced by the application of

Seed germination requires:
$I$. Light
$II$. Suitable temperature
$III$. Moisture
$IV$. Oxygen
Select the correct option.

It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

Which one of the following pairs of plant hormones inhibits flowering in some plants?

One hormone hastens the maturity period in juvenile conifers,a second hormone controls xylem differentiation,while the third increases the tolerance of plants to various stresses. They are respectively:

Which one of the plant growth regulators would you use if you are asked to:
$(a)$ Induce rooting in a twig
$(b)$ Quickly ripen a fruit
$(c)$ Delay leaf senescence
$(d)$ Induce growth in axillary buds
$(e)$ 'Bolt' a rosette plant
$(f)$ Induce immediate stomatal closure in leaves.