1. ‘Viroids’ is discovered by
a) Ivanowsky
b) T. O. Diener
c) Beijerinck
d) Stanley
Explanation: ‘Viroids’ is discovered by T. O. Diener.
2. Viroids are
a) Free protein
b) Free RNA
c) Free DNA
d) Free saccharides
Explanation: Viroids are Free RNA
3. The molecular weight of RNA of viroid is
a) High
b) Low
c) Very high
d) Any of the above
Explanation: The molecular weight of RNA of viroid is Low
4. Lichens are symbiotic association between
a) Algae and bacteria
b) Bacteria and fungus
c) Algae and fungus
d) Fungus and root of higher plant
Explanation: Lichens are symbiotic association between Algae and fungus.
5. In lichen, the algal component is called ______ and fungal component is called ______.
a) mycobiont, phycobiont
b) phycobiont, mycobiont
c) phycobiont, mycorrhazia
d) mycorrhaiza, mycobiont
Explanation: In lichen, the algal component is called phycobiont and fungal component is called mycobiont.
6. Which one of the following is heterotrophic in lichen?
a) Fungus
b) Algae
c) Both (a) and(b)
d) None
Explanation: Fungus is heterotrophic in lichen.
7. Lichens are
a) Pollution indicators
b) Symbiotic association between algae and fungus
c) Pioneer species in primary succession on rocks
d) All of the above
Explanation: All of the above
8. Which of the following is incorrect about lichens?
a) Algae part is autotrophic
b) Fungus part absorb nutrient and minerals
c) Fungus provide shelter to algae
d) Algae provide shelter to fungus
Explanation: "Algae provide shelter to fungus" This is incorrect.
9. Identify the A, B, C and D in this figure
a) A–Spirilla, B–Vibrio, C–Flagellum, D–Cocci
b) A–Cocci, B–Flagellum, C–Spirilla, D–Vibrio
c) A–Vibrio, B–Spirilla, C–Cocci, D–Flagellum
d) A–Flagellum, B–Spirilla, C–Cocci, D–Vibrio
Explanation: A–Flagellum, B–Spirilla, C–Cocci, D–Vibrio
10. Identify around structure ‘A’ in this diagram
a) dsDNA
b) Plasmid
c) Spore
d) Cosmid
Explanation: Spore