NEET

In which of the following, all listed genera belong to the same class of algae

The yield of paddy can be increased by the application of-

Red tides are caused by-

During monsoon ground becomes slippery because of –

Which blue-green alga remain in symbiotic association with Anthoceros ?

Alga associated with Cycas root is –

What is true about male and female gametophyte in plant kingdom ?

In bryophytes and pteridophytes they have independent free-living existence.
In gymnosperms and angiosperms they have no independent free-living existence.
Both (a) and (b)
In bryophytes, pteridophytes and angiosperms they have free-living life. They remain in sporangia which are retained on sporophytes.

Nitrogen fixers in Azolla is –

Agar-agar is obtained from

Solution

Agar-agar is a jelly like substance. It is a non-nitrogenous carbohydrate consisting of two polysaccharides namely agarose and agaropectin. It is obtained from several red algae,e.g., Gracillaria, Gelidium, Gigartina.

Which of the following occurs both in fresh as well as in marine water?

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