Auxin in plant means for

• cell elongation

• fruit ripening

• cell division

• inhibit the root growth

72.

Pencils are prepared from the wood of

• Pinus vinaster

• Juniperus virginiana

• Chamaecyparis piscifera

• Abies pindrow

Ageing is retarded by

• ABA

• CKN

• GA

• C₂H₄

Agricultural chemicals include

• growth regulators

• fertilizers

• pesticides

• all of these

The dormancy of seed is regulated by

• ABA

• Ethylene

• GA- 3

• Dihydrozeatin

Which of the following is a day neutral plant

• Helianthus annuus

• Euphorbia pulcherrima

• Avena sativa

• Beta vulgaris

Which of the following is an antigibberellin

• Auxin

• Ethylene

• ABA

• Cytokinin

Identify the incorrect statement about ABA growth regulator

• It increases the tolerance of plants against different stresses.

• It acts as general plant growth inhibitor and inhibitor of metabolism.

• It helps in seed maturation and dormancy.

• It promotes morphogenesis and differentiation of shoots.

2,4- D is an effective

• fungicide

• weedicide

• rodenticide

• wormicide

Assertion: Secondary metabolites are produced in small quantities and their extraction from the plant is difficult and expensive.

Reason: Secondary metabolites can be commercially produced by using tissue culture technique.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.