Question

Select the option which fills in the blanks (a, b, c, d) in the following paragraph with a proper combination of (i), (ii), (iii) and (iv), wherein (i) represents longer,(ii) represents shorter, (iii) represents prevents, and(iv) represents induces. Short day (SD) plants flower when night lengths are a than a critical dark period. Interruption of the dark period by a brief light treatment b flowering in SD plants. Long day (LD) plants flower when night length is c than a critical period. Shortening of the night with a brief light treatment d flowering in LD plants.

• A. a- (i), b- (iv), c- (ii), d- (iii)
• B. a- (iv), b- (ii), c- (iii), d- (i)
• C. a- (ii), b- (iv), c- (iii), d- (i)
• D. a- (i), b- (iii), c- (ii), d- (iv)

Answer 1

The correct option is D a- (i), b- (iii), c- (ii), d- (iv)

Short day plants flower when the photoperiods length are short and the dark period is more than the critical dark period. if the long dark period is interrupted by any artificial light then it prevents flowering and only vegetative growth takes place. Long day plants only flower when night length is shorter than a critical period. If night period is interrupted by any light it still induces flower. Thus, the correct option is D.