Q12 of 48 Page 84

The photoperiod in plants is perceived at

This can be shown by experiment on leaf Xanthium pennsylvanicum, which is a short day plant. If the plant is defoliated and then allowed to flower under short day condition, it will not flower.

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10

ABA acts antagonistic to

 11

Monocarpic plants are those which

 1

Fill in the places with appropriate word/ words.

a. A phase of growth which is maximum and fastest is __________.


b. Apical dominance as expressed in dicotyledonous plants is due to the presence of more ________ in the apical bud than in the lateral ones.


c. In addition to auxin, a ________ must be supplied to culture medium to obtain a good callus in plant tissue culture.


d. ________ of a vegetative plants are the sites of photoperiodic perception.


 2

Plant growth substances (PGS) have innumerable practical applications. Name the PGS you should use to

a. Increase yield of sugar cane.


b. Promote lateral shoot growth.


c. Cause sprouting of potato tuber.


d. Inhibit seed germination.