Question
Name the following:
- Simplest sponges.
- Commonly known as bath sponge.
Name the following:
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| Ion | Valency(Charges) | Ion | Valency(Charge) |
| Sodium ion | 1+ | Nitrate ion | 1- |
| Copper ion | 2+ | Sulphide ion | 2- |
Explain different types of elements present in phloem.
What are the common symptoms of infection?
What is the intensity of sound wave? Give its relation with amplitude.