Biological Classification Chapter-Wise Test 6

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about Mycoplasma is correct?

Mycoplasma have a well-defined cell wall.
Mycoplasma are the smallest living cells known.
Mycoplasma can perform photosynthesis.
Mycoplasma have a double-membrane nucleus.
2

Mycoplasma are the smallest known living cells and are unique among bacteria as they lack a cell wall.

Which of the following organisms is a cyanobacterium?

Euglena
Paramecium
Nostoc
Plasmodium
3

Nostoc is a cyanobacterium capable of photosynthesis and nitrogen fixation.

Which of the following statements about diatoms is correct?

Diatoms are exclusively heterotrophic.
Diatoms have silica-embedded cell walls.
Diatoms lack a nucleus.
Diatoms reproduce only sexually.
2

Diatoms have silica-embedded cell walls, making them ecologically important in marine environments.

Which of the following statements about diatoms is correct?

Diatoms have silica-embedded cell walls.
Diatoms reproduce only sexually.
Diatoms are prokaryotic organisms.
Diatoms do not contribute to marine ecosystems.
1

Diatoms have siliceous cell walls, making them ecologically important in marine and freshwater ecosystems.

Which type of spore is formed by fungi during unfavorable conditions?

Zoospore
Basidiospore
Conidia
Oospore
4

Oospores are thick-walled, resistant spores formed by fungi to survive unfavorable conditions.

Which of the following is a distinguishing feature of dinoflagellates?

Presence of cilia
Two flagella in different orientations
Cell wall made of silica
Parasitic mode of nutrition
2

Dinoflagellates have two flagella, one lying longitudinally and the other transversely in a groove between cellulose plates.

Which of the following statements about Mycoplasma is incorrect?

Mycoplasma are the smallest free-living organisms.
Mycoplasma lack a cell wall.
Mycoplasma contain peptidoglycan in their cell walls.
Mycoplasma are resistant to antibiotics that target cell wall synthesis.
3

Mycoplasma lack a cell wall and therefore do not contain peptidoglycan.

What is the main function of the gelatinous sheath found in cyanobacteria?

Protection and buoyancy
Movement
Digestion of food
Protein synthesis
1

The gelatinous sheath in cyanobacteria provides protection and helps maintain buoyancy in water.

Which of the following groups includes organisms that use pseudopodia for locomotion?

Ciliates
Flagellates
Amoeboids
Sporozoans
3

Amoeboids, such as Amoeba, use pseudopodia (false feet) for movement and capturing food.

Which of the following statements about diatoms is correct?

Diatoms have silica-embedded cell walls.
Diatoms are exclusively heterotrophic.
Diatoms do not contribute to oxygen production.
Diatoms lack a nucleus.
1

Diatoms have silica-embedded cell walls, making them ecologically significant in aquatic ecosystems.

Performance Summary

Score:

Category Details
Total Attempts:
Total Skipped:
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
Accuracy:
0