The symbiotic algae found in the secretory cells of Hydra is Euchlorella. This algae forms a mutualistic relationship with the Hydra, providing it with oxygen and nutrients through photosynthesis while receiving protection and access to sunlight in return.
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The cell wall of algae is made of cellulose. Cellulose is a complex carbohydrate that provides structural support and protection for the cells of algae.
The causative agent of mosaic disease in potato is virus. It is specifically caused by the potato virus Y, which leads to symptoms such as mottled leaves, stunted growth, and reduced yield in potato plants.
Foot and mouth disease in animals is caused by a virus. It is a highly contagious viral infection that affects cloven-hoofed animals such as cattle, pigs, sheep, and goats.
Smallpox is caused by a virus. The smallpox virus, known as variola, was responsible for severe illness and high mortality rates. Thanks to global vaccination efforts, smallpox has been eradicated worldwide.