Question

Algae lacks any type of mechanical tissues, because

• A. They are attached to a substratum.
• B. Buoyancy keeps them erect in water.
• C. Mechanical tissue is degenerated during development.
• D. None of the above.

Answer 1

The correct option is B Buoyancy keeps them erect in water.

Algae are largely aquatic, either free floating (plankton) or attached (benthos). They occur in other habitats like moist stones, soil, wood etc. Algal lack mechanical tissue as buoyancy holds them erect and their flexibility resist the water tides without being torn. As they live in aquatic medium, no vascular tissues required for water conduction.

Therefore, the correct answer is option B.