Which of the following statements about the light reactions of photosynthesis in chloroplasts is/are true? A.
Chlorophyll (and other pigments) absorb light energy, which excites electrons.
B.
ATP is generated by photophosphorylation.
C.
The splitting of water molecules provides a source of electrons.
D.
None of these statements are true.
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a, b, and c are true

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.