Question

Mosses and frogs both need water as a need of fertilization where does syngamy occur and how is it assured in both this organism

Answer 1

In most of Aquatic organism such as majority of algae and fishes as well as in Amphibians (frog) , syngamy occurs in the external medium such as Water i.e., outside the body of organism. This type of gametic fusion is called External fertilisation.

While in many terrestial organism belonging to fungi, in a majority of plants (Bryophytes, pteridophytes, Gymnosperm and Angiosperms) and in higher animals such as reptiles, birds, mammals, syngamy occur inside the body of organism, hence known as Internal-fertilisation.

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Answer 2

External fertilization

Explanation:

• In both, the cases syngamy happens outside the body. Organisms exhibiting external fertilization show nice temporal relation between the sexes and unleash an oversized variety of gametes into the encircling medium (water) so as to boost the probabilities of syngamy.
• In external fertilization, syngamy happens within the external medium (water) i.e., outside the body of associate organism e.g., majority of alga, fishes also as amphibians. Disadvantages. Organisms undergoing external fertilization unleash an oversized variety of gametes indicating a better rate of temporal relation between the sexes.
• In fishes and frogs etc., an oversized variety of offsprings ar created. however such offsprings ar extremely at risk of predators threatening their survival up to adulthood.