Which experimental observations provided strong evidence for the presence of two distinct photosystems in photosynthesis?

Which one of the following is not a down hill movement of electrons is z – scheme?

By which plant pigment maximum absorption of radiation takes place in the blue and red regions of absorption spectrum?

Function/s of accessory pigments is/are

I. They enable wider range of wavelength of incoming light for photosynthesis

II. They absorb light and transfer the energy to chlorophyll-a

III. They protect reaction centre from photo-oxidation

Select the correct option

Where do the light-dependent reactions take place?

Photolysis of water releases I. electron II. proton III. oxygen Select the correct option

How many “down – hill” movements of electrons is found in the ‘Z’ – scheme.

Chemiosmosis requires?

1. A membrane 2) Proton pump 3) proton gradient 4) ATP ase

Which form of phytochrome is physiologically active?

I. The electrons that carriers photophosphorylation are located in the thylakoid membrane

II. During photophosphorylation, the chloroplast stroma becomes more acidic than the interior of thylakoid membrane

III. Protons diffuses through the protein channels which are ATP synthetase molecules

IV. ATP is formed from ADP + Pi on the stroma side of the thylakoid in the chloroplast

V. During photophosphorylation, water ionises to form ${H^ + }$, yielding electrons to PS-II

Which of the following statement are false?

${C_4}$ Plants are found among