Which of the following is not a fungus?
a. the photosynthetic part of a lichen
b. penicillium mold
c. mycorrhizae
d. the organism that causes athlete's foot baker's yeast

The correct answer is a. the photosynthetic part of a lichen.

Explanation:

Lichen is a symbiotic association in which the algae and fungi are associated with each other. Fungus can not make there own food so they are not photosynthetic like algae or plants and in lichens algae are the photosynthetic part while fungus plays the role of absorbing nutrients for the algal partner.

Lichens are found all over the world and they absorb industrial pollution very quickly so are also referred to as pollution indicators of the environment as they do not grow in a polluted area.  

Therefore the photosynthetic part of lichen is algae, not fungus so the correct answer is a.

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.

there really is life in the deepest part