How will you eradicate weeds from a field?

Some auxins like 2,4-D when used in low concentration act as weed killers. It is toxic to dicotyledonous broad leaved weeds growing along graminaceous crops. The hormone does not affect the mature monocotyledenous plants. 
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How can we quantitatively compare the growth of living system?


Quantitative comparisons between the growth of living system can be done in two ways :

(i) By measuring and comparing the total
growth per unit time that is the absolute growth rate.
(ii) By comparing the  growth of the given system per unit time expressed on a common basis that is the the relative growth rate.

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How can a fruit be made to ripen artificially?


We can make the fruit ripen artificially by keeping it in an environment rich in ethylene. Ethylene causes fruit ripening. 
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What is plasticity?

The ability to follow different pathways in response to environment or phases of life to form different kinds of structure is called plasticity. For example heterophylly in coriander. 

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What is floral hormone ?

The floral hormone or Florigen hormonal substance(s) that is responsible for flowering. The hormonal substance migrates from leaves to shoot apices for inducing flowering only when the plants are exposed to the inductive photoperiod.
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