Question

Why there cannot be growth of Spirogyra in sea?

Answer 1

motility. This motility is associated with the secretion of pectic mucilage from the cells. The gliding of these cells is not directed toward light but photosynthesis is the energy source for it. The secretion of mucilage causes older Closteriumcultures to become thick gelatinous clusters. Spirogyra filaments when undisturbed grow to form thick multistranded rings. This growth pattern might result from the tendency of the filaments to rotate on their long axis.
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Answer 2

because she's contains saline water which is unsuitable for its growth