Diatomaceous earth is used as heat insulator in boilers and steam pipes because the cell wall of diatom is:
1. | composed of iron | 2. | composed of silicon dioxide |
3. | conductor of heat | 4. | bad conductor of electricity |
In which group of organisms the cell walls form two thin overlapping shells which fit together?
1. | Chrysophytes | 2. | Euglenoids |
3. | Dinoflagellates | 4. | Slime moulds |
Which of the following organisms are known as chief producers in the oceans?
1. | Dinoflagellates | 2. | Diatoms |
3. | Cyanobacteria | 4. | Euglenoids |
Select the wrong statement:
1. Cell wall is present in members of Fungi and Plantae
2. Mushrooms belong to Basidiomycetes
3. Pseudopodia are locomotory and feeding structures in Sporozoans
4. Mitochondria are the powerhouse of the cell in all kingdoms except monera
How many organisms in the list given below are autotrophs ?
Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Wolfia
1. | Five | 2. | Six |
3. | Three | 4. | Four |
The guts of cow and buffalo possess
1. | Fucus sp | 2. | Chlorella sp |
3. | methanogens | 4. | cyanobacteria |
One of the major compound of cell wall of most fungi is:
1. | peptidoglycan | 2. | cellulose |
3. | hemicelluloses | 4. | chitin |
After karyogamy followed by meiosis, spores are produced exogenously in
1. | Neurospora | 2. | Alternaria |
3. | Agaricus | 4. | Saccharomyces |