Cyanobacteria

Q. How many of the following organisms cannot fix the atmospheric nitrogen in a free living condition?
Frankia, Anabaena, Rhodospirillum, Beijernickia, Rhizobium, Azotobacter, Nostoc

1. 2
2. 4
3. 5
4. 3

Q. Lichen is the symbiotic association of

1. protista and algae
2. fungi and bacteria
3. protista and fungi
4. algae and fungi

Q.

What are heterocysts? Where are they found?

Q. Nostoc and Anabaena have specialised cells called heterocysts for

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

Q.

Are algae plants or protists?

Q. ___________ are also known as golden algae.

1. Diatoms
2. Desmids
3. Euglenoids
4. Plankton

Q. Which pigment gives blue colour to the blue-green algae?

1. Phycocyanin
2. Phycocolloid
3. All of the above
4. Phycoerythrin

Q.

Question 17
Cyanobacteria and some other photosynthetic bacteria don't have chloroplasts. How do they conduct photosynthesis?

Q. Laminarin and mannitol, the reserve food of brown algae, are

1. lipids
2. complex carbohydrates
3. proteins
4. lipoproteins

Q.

Where is algae found?

Q.

Do algae reproduce asexually?

Q. The cyanobacteria are also referred to as

1. Slime moulds
2. Blue green algae
3. Protists
4. Golden algae

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

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

Q. Cyanobacteria are monerans which have

1. they have chlorophyll in chloroplasts
2. the ability to perform oxygenic photosynthesis due to the presence of chlorophyll a
3. the ability to perform oxygenic photosynthesis and do not have chlorophyll a
4. the ability to do anoxygenic photosynthesis and possess nitrogenase

Q.

Are diatoms unicellular organisms?

Q. Mycoplasma are classified under which of the following kingdoms ?

1. Monera
2. Protista
3. Fungi
4. Plantae

Q.

Do bacteria have chloroplasts?

Q.

Cyanobacteria are classified under

(a) Protista (b) Plantae (c) Monera (d) Algae

Q. Which of the following is a flagellated alga?

1. Spirogyra
2. Acetabularia
3. Chlamydomonas
4. Ulothrix

Q.

Oxygen is harmful for

1. Ferns

2. Nitrogen-fixing bacteria

3. Chara

4. Mango tree

Q. Select the correct statements w.r.t. characteristics of certain organisms.
(a) Methanogens are archaebacteria which produce methane in marshy areas.
(b) Nostoc is a filamentous green algae which fixes atmospheric nitrogen.
(c) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
(d) Mycoplasma lacks a cell wall and can survive without oxygen.

1. (a), (b), (c) & (d)
2. (a), (b) and (d)
3. (c) & (d)
4. (a) & (d)

Q. Which one of the following categories of organisms does not evolve oxygen during photosynthesis?

1. Photosynthetic bacteria
2. Blue green algae
3. $C_4$ plants with Kranz anatomy
4. Red algae

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

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

Q. What is true for cyanobacteria ?

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

Q.

In a way green plants and cyanobacteria have synthesised alt the food on the earth. Comment.

Q. Archaebacteria differ from eubacteria in which one of the following respect?

1. Their cell wall lack peptidoglycan compound
2. They inhabit extreme environment
3. They have unique 16s RNA
4. All of the above

Q.

Dikaryophase is not observed in

(a) penicillium

(b) ustilago

(c) Albugo

(d) puccinia

Chlorophyll a, similar to green plants, is found in_______

(a) Anabaena

(b) Euglena

(c) Nitrobactor

(d) All of these

Q. Cyanobacteria differ from bacteria as these:

1. Perform oxygenic photosynthesis
2. Exhibit sexual reproduction
3. Do not have membrane bound cell organelles
4. Have circular double stranded DNA

Q. All algae exhibit haplontic life cycle.

1. True
2. False

Q. How many of the following organisms cannot fix the atmospheric nitrogen in a free living condition?
Frankia, Anabaena, Rhodospirillum, Beijernickia, Rhizobium, Azotobacter, Nostoc

1. 2
2. 4
3. 5
4. 3