Question

1. Plant body of .......... is many meters in length.
(a) Spirogyra (b) Nostoc (c) Macrocystis (d) Chlorella
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Answer 1

Answer:

chlorella

Explanation:

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Answer 2

Answer: c)Macrocystis

Plant body of Macrocystis is several meters in length.

Explanation:

• Macrocystis is a monospecific genus of Large brown algae (kelps).They can grow at a rate of 60 cm (2 ft) a day to reach over 45 m (150 ft) long in one growing season. It comes under one of the fastest growing organisms in the world. Macrocystis is the largest alga and M.pyrifera is the largest algal species in the world.

• Nostoc is a genus of cyanobacteria or Blue green algae whose length varies in centimeters depending on the species.

• Spirogyra is a filamentous green algae and may grow upto several centimeters in length.

• Chlorella is a unicellular green alga whose cell length is 2-10 micrometers.