Why is it significant that pollen contains a multicellular male gametophyte instead of just male gametes?
the non-gamete cells of the male gametophyte provide protection from desiccation and uv radiation.
the non-gamete cells of the male gametophyte provide nutrition that supports the development of the embryo.
the non-gamete cells of the male gametophyte undergo meiosis.

The given options are false regarding the question, the correct answer should be -

multicellular male gametophyte has a non-gamete cell that controls growth and development to the pollen tube and the male gamete.

The importance of these nongenetic cells of the male gametophyte is to control the development and growth of pollen tube that is an essential structure for pollination and fertilization.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.