Question

Green algae usually have a rigid cell wall made of an inner layer of _____ and an outer layer of ______.
A) Cellulose, cellulose
B) Pectose, pectose
C) Pectose, cellulose
D) Cellulose, pectose

Answer 1

Hint:Green algae is a huge group of algae which have the capability to conduct photosynthesis as they have chlorophyll. They generally live in freshwater.

Complete answer:
Let us know a little bit more about green algae first. They are photosynthetically active and have the ability to conduct photosynthesis as they have chlorophyll a and b. The members can be unicellular or multicellular, colonial.
Common examples of green algae are - Volvox, Ulothrix, etc.

Option A: The cell wall of green algae is made up of both cellulose and pectose. Therefore, this is the incorrect option.
Option B: The cell wall of green algae is made up of both cellulose and pectose. Therefore, this is the incorrect option.
Option C: The cell wall of green algae is made up of both cellulose and pectose. The outer layer is made up of pectose whereas, the inner layer is made up of cellulose. The cell wall is a thin, firm and transparent layer which is found as the outermost layer in green algae. Therefore, this is the correct option.
Option D: The cell wall of green algae is made up of both cellulose and pectose. But, pectose is found in the outer layer and cellulose is found in the inner layer and not vice versa. Therefore, this is the incorrect option.

Thus, the correct option is (C) Pectose, cellulose.

Note:Cell wall is absent in animal cells but present in plant cells The function of cell wall is as follows,
They help in maintaining structural stability.
They prevent water loss from the cell.
They help in transport of material between the cells.