Question

B. Self fertilization in hydra never occurs,
because they are :​

Answer 1

Answer:

is a genus of small, fresh-water organisms of the phylum Cnidaria and class Hydrozoa. They are native to the temperate and tropical regions.[2][3] Biologists are especially interested in Hydra because of their regenerative ability – they do not appear to die of old age, or indeed to age at all.

Answer 2

Answer: Unisexual and bisexual

Explanation:

. Hydra is a frest water coelenterate and is carnivores.

. Hydra has a great power if regeneration which was first discovered by Trembley.

. Both bisexual and Unisexual Hydras are found.

. A unicellular green alga Zoochlorella lives in nutritive muscular cells of Hydras viridissima.

. The most hydra is benefitted by utilising O2 released in photosynthesis by the alga. Such association by which both organism are mutually benefitted is called symbiosis.