Question

Chief producers in the ocean
1) Are multicelluar
2) Have cell wall impregnated with silica
3) Do not reproduce sexually
4) Have flagella in vegetative phase ​

Answer 1

Explanation:

Diatoms are a type of protists that are categorized under the group called Chrysophytes. These organisms are microscopic and float passively in water currents. These are chief producers in the ocean as they are found in the large amount and are photosynthetic in nature. Their cell wall is made up of silica and thus it is not destructible. When diatoms die, they left their cell wall in their habitat which accumulates over billions of years over the earth surface and is called 'Diatomaceous Earth' which is used in polishing or filtration of oils. Hence, the correct answer is option A.

Answer 2

Are multicellular
Hope it helps!!