Question
Define diploblastic animals.
Define diploblastic animals.
Animals in which the cells are arranged in two embryonic layers, an external ectoderm and an internal endoderm, are called diploblastic animals, e.g., coelenterates.
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A body is moving along a circular path of radius R. What will be the distance travelled and displacement of the body when it completes half a revolution?
| Ion | Valency(Charges) | Ion | Valency(Charge) |
| Sodium ion | 1+ | Bromide ion | 1- |
| Ammonium ion | 1+ | Hydroxide ion | 1- |
| Calcium ion | 2+ | Sulphate ion | 2- |
| Lead ion | 2+ | Phosphate ion | 3- |
What are infrasonic waves? Name two animals which produce infrasonic waves.
Write names of cell organelles.
Why is nucleus called director of the cell?