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Algae

This class of...

Question

This class of algae has chlorophyll a, c and fucoxanthin as major pigments, uses mannitol and laminarin to store food and its cell wall has cellulose and algin. Identify the class of algae.

A

Chlorophyceae

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B

Phaeophyceae

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C

Rhodophyceae

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D

Cyanobacteria

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Solution

The correct option is B Phaeophyceae
The class of brown algae (Phaeophyceae) is characterised by:
i) presence of chlorophyll a, c and fucoxanthin as major pigments
ii) uses mannitol and laminarin to store food
iii) cell wall has cellulose and algin.

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Q. This class of algae has its cell wall made up of cellulose and algin, with chlorophyll a, c and fucoxanthin as its pigments. The reserve food is mannitol and laminarin. Identify the class.

Q. Consider the following statements regarding the major pigments and stored food in the different groups of algae and select the correct options given.
A. In chlorophyceae, the stored food material is starch and the major pigments are chlorophyll a and d.
B. In phaeophyceae, laminaria is the stored food and major pigments are chlorophyll a and b.
C. In rhodophyceae, floridean starch is the stored food and the major pigments are chlorophyll a, d and phycoerythrin

Q. Find the wrong statements.

(a)

Ulothrix and Spirogyra are filamentous forms

(b)

Porphyra and Laminaria are fresh water algae

(c)

Stored food is in the form of mannitol in rhodophyceae

(d)

Chlorella and Spirulina are unicellular algae

Q. Cyanobacteria are commonly called blue-green algae. This is because they possess in addition to chlorophylls a blue pigment called

Q. Consider the following statements regarding the
major pigments and stored food in the different
groups of algae and choose the correct option

(i) In chlorophyceae, the stored food material is starch and the major pigments are chlorophyll a and d.

(ii) In phaeophyceae, laminarin is the stored food and major pigments are chlorophyll a and b.

(iii) In rhodophyceae, floridean starch is the stored food and the major pigments are chlorophyll a, d and phycoerythrin

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