Tamil Nadu (English Medium) Plus 2 Biology Science Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1
Who gave the term 'phytochrome?

(A) Moore and Chase	(B) Beadle and Tatum
(C) Garner an Allard	(D) Borthwick and Hendricks

Question-2
Which of the following is the stress hormone?

(A) IAA	(B) IBA
(C) ABA	(D) 2, 4-D

Question-3
Bud dormancy is induced by

(A) ABA	(B) IAA
(C) ethylene	(D) gibberalic acid

Question-4
cell elongation in internodal regions of the green plants takes place due to

(A) ethylene	(B) cytokinin
(C) gibberellin	(D) indole acetic acid

Question-5
Which of the following plant hormones reduce the transpiration rate by inducing stomatal closure?

(A) ABA	(B) ethylene
(C) cytokinin	(D) gibberellin

Question-6
Which of the following pigments is found in two forms?

(A) phytophore	(B) phytochrome
(C) cytochrome	(D) chlorophyII

Question-7
Richmond Lang effect was found on the leaves of

(A) Riccia	(B) Funaria
(C) Pharbitis	(D) Xanthium

Question-8
The deteriorative processes in plants, that naturally terminate their functional life, are collectively called

(A) wilting	(B) abscission
(C) plasmolysis	(D) senescence

Question-9
The most common auxin is

(A) GA	(B) ABA
(C) kinetin	(D) indole acetic acid

Question-10
A sleep movement in plants is a nastic response, that occurs daily in respose to

(A) dark	(B) light
(C) water	(D) both '1' and '2'

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Plus 2 Biology Science

Tamil Nadu (English Medium)

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