Sense of smell
Sense of smell is known to
be part of the chemosensory system or chemical senses. It also a warning
system that alert to danger signals such as fire, gas leakage or spoiled food.
Thus, the sense of smell comes from the specialized sensory cells known as
olfactory sensory neurons.
No.
This method of stating population density is carried out by counting the number of specimen in a given area and then dividing the number of specimen by that area. This does not mean that each specimen is one meter apart. Some regions may have no specimens for multiple meters while other regions may have multiple specimen in the same meter. The population density gives us an average value.
Percolating water can both remove mineral materials as well deposit it. Percolating water removes the undesirable materials from the rocks that come in its contact. In this way it erodes the surface of the rock and deposits it on the upper layer of the soil, thus enriching the soil.
Similarly the desirable materials are removed from the surface and deposited and concentrated. These processes are referred as secondary enrichment.
Answer:
The shoot of a grass seedling is enclosed in a sheath called the coleoptile, which grows straight upward if kept in the dark or illuminated uniformly from all sides. If it is illuminated from one side, it will curve toward the light as a result of differential growth of cells on opposite sides of the coleoptile.
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