The main signal in small intestine for pancreatic bicarbonate ion secretion is Secretin.
When food from the stomach with acidic medium enters duodenum(first part of small intestine) it stimulates the lining of duodenum cells to release the hormone secretin.
This hormone travels via bloodstream to pancreas and stimulate to it to release bicarbonate ions.Now these ions enter duodenum and neutralise the acidic medium.
This results in the optimum pH for the enzymatic action to take place thereby promoting final digestion of protein.
Immotile flowering plants accomplish fertilization with the help of Insects and other pollen from organisms that carry pollen to other flowers.
Explanation:
- The transfer of pollen from anther to the stigma of flower is called pollination.
- Pollination is of two types: a) Self pollination b) cross-pollination
- Transfer of pollen from anther to the stigma of same flower or flower of same plant is called self pollination.
- Transfer of pollen from anther to the stigma of different plant is called Cross-pollination.
- Pollination is the process by which angiosperms carry out sexual reproduction.
- Since, plants are immobile they need some agents for pollination like, <u>insects birds, wind, water etc </u>
The rate of evaporation on the surface of a lake would be increased by the sunlught.
The more intense the sunlight, the bigger the temperature, the more the water gets warmer, thus evaporates at a higher rate. On the other hand, if the sunlight is weaker, the temperatures are lower, the water cools off, thus the evaporation will be at a smaller rate.
Destructive interference
The Doppler Effect
Diffraction