Cyanobacteria

Q. Match the organisms in column I with habitats in column II:

	Column I		Column II
(a)	Halophiles	(i)	Hot spring
(b)	Thermoacidophiles	(ii)	Aquatic environment
(c)	Methanogens	(iii)	Guts of ruminants
(d)	Cyanobacteria	(iv)	Salty area

1. (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
2. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
3. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
4. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

Q.

How does a Paramecium get food?

Q.

Are bacteria the main nitrogen reservoir?

Q. Which among the following have peptidoglycan and amino acids in their cell wall?

1. Archaebacteria and eukaryotes
2. Eukaryotes and protists
3. Monera and protista
4. Bacteria and cyanobacteria

Q.

Do bacteria have plasmodesmata?

Q. The cells of Cyanobacteria and Bacteria exhibit similarity in ____.

1. Plastids
2. Nuclei
3. DNA
4. Centrosome

Q. Nostoc and Anabaena have specialised cells called heterocysts for

1. absorption of water
2. absorption of minerals
3. fixing atmospheric nitrogen
4. transfer of oxygen

Q. All cyanobacteria can perform photosynthesis in the presence of sunlight and hence are photoautotrophs.

1. False
2. True

Q. Oxygen is not produced during photosynthesis by

1. Cycas
2. Nostoc
3. Green sulphur bacteria
4. Chara

Q. Which among the following statements is TRUE regarding cyanobacteria?

1. Cyanobacteria can reproduce sexually using special cells called heterocysts.
2. They perform oxygenic photosynthesis
3. Photosynthetic pigments such as chlorophyll-b, phycocyanin and phycoerythrin are present in cyanobacteria.
4. Cellulose is the reserve food material in cyanobacteria.

Q. is a type of prokaryote which have photosynthetic pigments similar to plants.

1. Eubacteria
2. Archaebacteria
3. Cyanobacteria
4. Mycoplasma

Q. Select the correct match:

1. a-sheath-protective
   b-akinete-nitrogen fixation
   c-heterocyst-reproductive cells
2. a- sheath-protective
   b-heterocyst-reproductive cells
   c-akinete-nitrogen fixation
3. a-sheath-protective
   b-heterocyst-nitrogen fixation
   c- akinete-reproductive cells
4. a-heterocyst-protective
   b-sheath-nitrogen fixation
   c-akinete-reproductive cells

Q. What is true for cyanobacteria ?

1. Oxygenic with nitrogenase
2. Oxygenic without nitrogenase
3. Non oxygenic with nitrogenase
4. Non oxygenic without nitrogenase