Question
List one denitrifying bacteria.
List one denitrifying bacteria.
Pseudomonas is a denitrifying bacteria that converts nitrates in soil to free atmospheric nitrogen.
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Which type of epithelium is present in the organs where exchange of substances takes place?
The audible range of frequencies of an average human ear is from 20Hz to 20kHz. Calculate the corresponding wavelengths. (Speed of sound in air is 344ms-1).
Explain the term ‘pitch’ of a sound. On what factor does the ‘pitch’ of a sound depend?
Cytoplasmic bridges between adjacent plant cells are called?
| Ion | Valency(Charges) | Ion | Valency(Charge) |
| Sodium ion | 1+ | Nitrate ion | 1- |
| Copper ion | 2+ | Sulphide ion | 2- |
Distinguish between the following:
Ribosome and centrosome.