Scientists knew that the plant under consideration expresses phytochrome in its

ID: 207985 • Letter: S

Question

Scientists knew that the plant under consideration expresses phytochrome in its leaves. Consider the experimental trial labeled "(a)" on the lefthand side in the diagram below. If the plant were exposed to a period of relatively high intensity far- red light in the middle of the dark period of this particular trial, what effect would this most likely have on flowering? Light Dark (a) D Flowering Light Dark Flowering The plant would likely begin to flower. The plant would likely continue to not flower

Explanation / Answer

Answer- The plant would likely to begin to flower.

Explanation:- The plants are long day plants having phytochrome in their leaves, here the day is longer than the night period.

Phytochromes are the pigments present in plants which helps in flowering, phytochromes present in plants are in two interconvertible forms they are Pfr 730 and Pr660. Pr660 absorbs light in red and convert it to second form Pfr730. Pfr730 absorbs light in far red region.

Exposure of Pfr730 to far red light converts it back to Pr660 also Pfr730 slowly reverts back to Pr660 in darkness. Pfr730 is physiologically active form of phytochrome, and it inhibits flowering in short day plants and promotes flowering in long day plants. There is a critical Pfr730 level below that level, flowering is not inhibited in short-day plants and neither promoted in long-day plants.

Interrupting the dark period during short days (long nights) with red light stops the reversion of Pfr730 to Pr660 and converts Pr660 to Pfr730. This prevent the level of Pfr730 from dropping below the critical Pfr730 level and, as a result it inhibits flowering, in short-day plants and promotes flowering in long-day plants.

Night interruption lighting is used to promote flowering in long day plants and prevent flowering in short day plants.

here in the experimental trial, plants were exposed to a period of relatively high intensity far red light in the middle of the dark period . As Pfr730 promotes flowering in long day plants, here plants would begin to flower.

Navigate

Scientists in the laboratory set up a uniform electric field of -2.300×103 V/m a

Scientists knew they had to keep their cultures free from bacterial and viral co

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.

Scientists knew that the plant under consideration expresses phytochrome in its

Question

Explanation / Answer

Related Questions

Navigate