Which sex hormone is produced by the testes in males?

Length of pollen tube depends on the distance between

Would a Planaria cut vertically into two halves regenerate into two individuals? Complete Figure $D$ and $E$ by indicating the regenerated regions.

Give two examples each of the following:
$(a)$ Plants having unisexual flowers
$(b)$ Agents of pollination
$(c)$ Physical changes on puberty that are common to both boys and girls.

From the internet,gather information about the chromosome numbers of five animals and five plants. Correlate the number with the size of the organism and answer the following questions.
$(a)$ Do larger organisms have a higher number of chromosomes/cells?
$(b)$ Can organisms with fewer chromosomes reproduce more easily than organisms with a higher number of chromosomes?
$(c)$ Does a higher number of chromosomes/cells imply greater $DNA$ content? Justify.

The process of spore formation takes place in many simple multicellular organisms which have certain reproductive parts that can be identified.
$(a)$ Name the organism using this process.
$(b)$ Name the reproductive and non-reproductive parts of such organisms.