During the photosynthetic light reactions, a cluster of pigments and proteins called uses light and and proteins of the photosynthetic electron transport chain to produce (a form of energy) and the by-product .

Chlorophyll, water, ATP, NADPH

Explanation:

Photosynthetic light reaction takes place in the thyllakoid membrane of green plants. The Chloroplast of green plants harbors pigment molecules called Chlorophyll; which has the ability to capture the energy of light. This captured energy is used to generate high energy electrons which reduces NADP+ to NADPH and also produces ATP which are further used to produce sugar(food) in the next stage of photosynthetis called Calvin cycle.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

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