Question

What are the Richest source of phytochrome in plants​

Answer 1

Answer:

LEAVES.

Explanation:

Answer 2

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Presumably plant phytochromes are derived from an ancestral cyanobacterial phytochrome, perhaps by gene migration from the chloroplast to the nucleus. Subsequently, phytochromes have been found in other prokaryotes including Deinococcus radiodurans and Agrobacterium tumefaciens.