Question

Phytochrome is
A. Pigment that controls photo morphogenesis and development
B. Regulatory protein that controls dark dependent process
C. Hormone
D. Photosynthetic hormone

Answer 1

Hint: Photoperiodism is related with the pigment called photochromic. Photochromic is the photopigment because it’s photo sensitive in nature. It is a kind of protein link structure like tetrapyrrole ring used for dimer structure. It can change the wavelength confirmation because of the light particles and also convert the structure's less active form to more active form. In high active form all major chemical processes started.

Complete answer:
The basic form of photochromic is Pr and the type most active form of the photochromic known as Pfr. It’s structural change between the help of Pr and Pfr. Pfr absorbs red wavelength at 670 nm and shifts Pr to Pfr getting day time, at the night time the wavelength range is 730 nm that is far away from the red zone and shifts PFr to Pr. Pr form is not more active but the Pfr most active and helps to produce the plants like flowering.
Phytochrome is a part of the photoreceptors class that is present in the plants, bacteria and fungus. There are two types of region present in the photochromic type 1 which is active form in the far red light and type 2 which is active for the red light. Phototropism is present in the photochromic that has the ability to sense light and cause the plants to grow towards the light.

Therefore the correct option is (A).

Note: Mutation present in the photochromic inactive the plant development. There are two types of mutation present in the photochromic phyA-101 and phyB -1. Phy-101 plays a role in the red light and phy-1 plays a role in far red light. On the basis of photochromic many transgenic plants obtained in genetic engineering like potatoes, rice and tomato.