Question
Write down three unique characteristics of storage structure.
Write down three unique characteristics of storage structure.
For the storage of grains, grain silos are used. The silos are big and tall cylindrical structures. They are provided with outlets at different levels to withdraw the desired stock of grains. They have built in arrangement for aeration, temperature control, protection from insects, rats, birds etc.
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Each beehive consists of thousands of hexagonal thin-walled fragile cells. Name the material which is used to make these cells and mention the significance of the hexagonal shape of the cell.
Why are protozoa are regarded as early animals?
What are medullated nerve fibres?
What are common names? Write down their disadvantages.
What are the signs of infestation of stored grains?
Explain rain water harvesting.
Which cellular organelle uses, molecular oxygen like mitochondria bit protects the cell from toxic metabolic by products?