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.
11. Chlorophyceae are grass green due to the dominance of pigment
a) Chlorophyll a, c
b) Chlorophyll b, a
c) Chlorophyll d, c
d) All of these
Explanation: Chlorophyll b, a
12. Pyrenoids are located in
a) Cytoplasm
b) Mitochondria
c) Chloroplast
d) Nucleus
Explanation: Pyrenoids are located in chloroplast.
13. Pyrenoids store
a) Protein
b) Starch
c) Lipids
d) Both (a) and (b)
Explanation: Pyrenoids store protein and starch.
14. Cell wall of green algae is made up of
a) Cellulose and pectose
b) Cellulose and pectin
c) Inner layer of pectose and outer layer of cellulose
d) Inner layer of cellulose and outer layer of pectose
Explanation: Cell wall of green algae is made up of inner layer of cellulose and outer layer of pectose.
15. Zoospores are formed during asexual reproduction of algae and formed in
a) Sporangia
b) Zoosporangia
c) Microsporangia
d) Megasporangia
Explanation: Zoospores are formed during asexual reproduction of algae and formed in zoosporangia.
16. Sexual reproduction is of isogamous, anisogamous and oogamous in
a) Chlorophyceae
b) Rhodophyceae
c) Chlorophyceae and Phaeophyceae
d) Chlorophyceae and Rhodophyceae
Explanation: Chlorophyceae and Phaeophyceae
17. Algae which are primarily marine is
a) Red algae
b) Brown algae
c) Green algae
d) All of these
Explanation: Brown algae
18. Filamentous brown algae is
a) Spirogyra
b) Laminaria
c) Ectocarpus
d) Porphyra
Explanation: Filamentous brown algae is Ectocarpus.
19. Green algae performs _______ oogamous type sexual reproduction
a) Sphagnum
b) Volvox
c) Dictyota
d) Spirogyra
Explanation: Green algae performs volvox oogamous type sexual reproduction.
20. Kelps represent the group of
a) Bryophytes
b) Red algae
c) Green algae
d) Brown algae
Explanation: Brown algae