5. Energy lost to the environment is greater than energy transferred to the
next trophic level. Why?
6. Write one function of guard cells.
OR
What do you mean by peristaltic movement?
7. Tungsten filament is used in an electric bulb. Give reason.
Answers
5A) Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level. ... A food chain can usually sustain no more than six energy transfers before all the energy is used up.
6A) Guard cells are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata.
7A) Tungsten is used for making filament of an electric bulb due to the following reasons: Being an alloy it has a very high melting point. It has very high resistivity so it does not burn easily at room temperature. The lamp glows at high temperatures.
Answer:
5) Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level. ... A food chain can usually sustain no more than six energy transfers before all the energy is used up.
6) opening and closing of the stomatal pore is the function of guard cells
7) Tungsten is used for making filament of an electric bulb due to the following reasons: Being an alloy it has a very high melting point. It has very high resistivity so it does not burn easily at room temperature. The lamp glows at high temperatures.