Answer :

(a) X is Yeast.

Explanation: Yeasts are unicellular fungi which convert glucose into alcohol through the process of fermentation. 

(b) The process in which X converts sugar into alcohol is called Fermentation. 

Explanation:The following chemical reaction takes place:

Yeast + Glucose → Alcohol (l) + CO(g)

(c) The organism X i.e. Yeast belongs to the fungi of living organisms.

Explanation: Yeast is a single-cellular organism which divides by mitosis and shows budding. Fungi have the following characteristics:
i) They have a cell wall.
ii) They have a nucleus.
iii) They have no chloroplasts.

(d) Organism Y is Hydra.

Explanation: Hydra is a genus of small fresh-water animals

(e) Yeast ( X) is a unicellular and Hydra (Y) is a Multicellular.

Explanation: Yeasts are unicellular organisms because they are single-celled organisms.
Hydra are multicellular organisms with complex bodies

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