The first step in photosynthesis is

  • A
    Excitation of chlorophyll by light
  • B
    Ionisation of water
  • C
    $ATP$ synthesis
  • D
    Production of assimilatory power

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If the wavelength of light exceeds $680 \ nm$,the rate of photosynthesis decreases. Which scientist demonstrated this,and what was the reason?

During the light reaction,electrons are transferred by the splitting of $H_2O$ through the $ETC$,which results in the reduction of:

The first electron acceptor from an excited chlorophyll molecule of Photosystem-$II$ is .......

In photosynthesis, which phase involves the following phenomena?
$(I)$ Water is split $(photolysis)$
$(II)$ Oxygen is liberated
$(III)$ $NADPH$ is formed

Emerson's enhancement effect and Red drop have been instrumental in the discovery of

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