Multiple Choice QuestionsPencils are prepared from the wood of
Pinus vinaster
Juniperus virginiana
Chamaecyparis piscifera
Abies pindrow
Ageing is retarded by
ABA
CKN
GA
C2H4
B.
CKN
Cytokinins are a class of plant growth substances (phytohormones) that promote cell division or cytokinesis, in plant roots and shoots. They are also involved in cell growth and differentiation but also affect apical dominance, axillary bud growth and leaf senescence.
Eg, degradation of protein and chlorophyll was delayed in the detached leaves of Xanthium, if cytokinin was used in a medium.
Which of the following is a day neutral plant
Helianthus annuus
Euphorbia pulcherrima
Avena sativa
Beta vulgaris
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.
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.
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