Diatomaceous earth is obtained from
Bacillarophyceae
Xanthophyceae
Rhodophyceae
Chrysophyceae
A.
Bacillarophyceae
Bacillariophyceae contains unicellular golden brown autotrophic protists (diatoms). As the name diatoms indicate the body is covered with bivalved silicaceous shell or frustule having an upper half or epitheca and a lower half or hypotheca.
Ciliates differ from all other protozoans in
using flagella for locomotion
having a contractile vacuole for removing excess water
having two types of nuclei
using pseudopodia for capturing prey
Match the following with correct combination.
| Column I | Column II |
| A. Cuscuta | 1. Saprophyte |
| B. Eichhornia | 2. Pneumatophare |
| C. Monotropa | 3. Insectivorous plant |
| D. Rhizophora | 4. Parasite |
| E. Utricularia | 5. Root pocket |
A |
B | C | D | E |
| 3 | 1 | 5 | 4 | 2 |
| A | B | C | D | E |
| 2 | 3 | 1 | 5 | 4 |
| A | B | C | D | E |
| 4 | 3 | 1 | 5 | 2 |
| A | B | C | D | E |
| 4 | 5 | 1 | 2 | 3 |
Which one of the following statements about mycoplasma is wrong?
They are also called PPLO
They are pleomorphic
They are sensitive to pencillin
They are sensitive to pencillin
Thermococcus, Methanococcus and Methanobacterium are groups of
Bacteria containing a cytoskeleton and all membrane-bound organelles
Archaebacteria with peptidoglycan in their cell wall
Archaebacteria that consists of protein homologous to eukaryotic core histones
Most advanced type of bacteria
Which of the following organisms are known as chief producers in the oceans?
Dinoflagellates
Diatoms
Euglenoids
Cyanobacteria
Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread?
A. Temperature of about 25°C
B. Temperature of about 5°C
C. Relative humidity of about 5%
D. Relative humidity of about 95%
E. A shady place
F. A brightly illuminated place
Choose the answer from the following options
A, C and E only
A, D and E only
B, D and E only
B, D and E only
Which of the following are found in extreme saline
conditions?
Archaebacteria
Eubacteria
Cyanobacteria
Cyanobacteria
What is common about Trypanosoma, Noctiluca, Monocystis and Giardia?
These are all unicellular protists
They have flagella
They produce spores
They produce spores
Viroids differ from viruses in having :
DNA molecules with protein coat
DNA molecules without protein coat
RNA molecules with protein coat
RNA molecules with protein coat
