1. Marine algae used as food are
a) Laminaria
b) Sargassum
c) Porphyra
d) All of these
Explanation: All of these
2. Hydrocolloids are secreted by
a) All of the algae
b) Only brown algae
c) Only red algae
d) Both red and brown algae
Explanation: Hydrocolloids are secreted by both red and brown algae.
3. Algin is secreted by
a) All of the algae
b) Only brown algae
c) Only red algae
d) Both red and brown algae
Explanation: Algin is secreted by only brown algae.
4. Carrageen is secreted by
a) All of the algae
b) Only brown algae
c) Only red algae
d) Both red and brown algae
Explanation: Carrageen is secreted by only red algae.
5. Microbes used in the preparation of ice cream and jellies are grown on the product secreted by
a) Chlorella
b) Spirullina
c) Gelidium and gracilaria
d) All of these
Explanation: Microbes used in the preparation of ice cream and jellies are grown on the product secreted by gelidium and gracilaria.
6. The algae rich in proteins and used as food by space travellers is
a) Chlorella
b) Spirullina
c) Both (a) and (b)
d) Laminaria
Explanation: Both (a) and (b)
7. Agar is commercially obtained from
a) Gelidium and gracilaria
b) Laminaria and spirulina
c) Chlorella and spirullina
d) Chlamydomonas and spirogyra
Explanation: Agar is commercially obtained from gelidium and gracilaria.
8. Green algae are kept in
a) Phaeophyceae
b) Xanthophylls
c) Xhlorophyceae
d) Rhodophyceae
Explanation: Green algae are kept in Xhlorophyceae.
9. The organism which contain chlorophyll ‘a’ and ‘b’ cup-shaped chloroplast and is unicellular is
a) Spirogyra
b) Chlamydomonas
c) Volvox
d) Ulothrix
Explanation: Chlamydomonas
10. Dominance of chlorophyll ‘a’ and ‘b’, pyrenoids and starch as stored food are found in
a) Members of chlorophyceae
b) Members of rhodophyceae
c) Members of phaeophyceae
d) All of these
Explanation: Dominance of chlorophyll ‘a’ and ‘b’, pyrenoids and starch as stored food are found in members of chlorophyceae.