Question

Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. Which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?
a. Pfr and phytochromeb. cytokinins and phototropinsc. auxin and Pfrd. auxin and phytochrome

Answer 1

Answer:

Pfr and phytochrome  would be analogous to mammalian opsins in their light-sensing ability.

Explanation:

• Phytochromes are proteins which are 'sensitive to light', and are able to  detect light sources on the plant body.

• These form an integral part of the leaves of a plant body.  

• These proteins are made up of two forms: Pf and Pfr. Pf exists in an inactive form of phytochrome which activates in the presence of light to form Pfr which is an active form.

• This Pfr induces a cellular response in the plant. Similar to the opsins in Mamalian eyes, these also change in structure when exposed to light.

• Hence, Pfr and phytochrome are the molecules which can be analogous to 'mammalian opsins' in their 'light-sensing ability'.