Which molecule do plants use to store extra glucose? a. glycogen b. myosin c. lipid d. starch

Option D, Starch

Explanation:

Starch is a polysaccharide which is used to store extra glucose in plants. Plant produces glucose (sugar) during the process of photosynthesis in the presence of sunlight.  Plant then uses this sugar to produce energy in the form of energy molecules ATP. Extra sugar which is stored in starch is used by plants whenever they need energy. A small amount of glucose is taken from starch to fulfill the energy requirement of plant.

Hence, option D is correct

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.