1)write the events in photosynthesis. How is it different in desert plants?
2) Explain the difference between autotrophs and heterotrophs
3) From where do aquatic, terrestrial and submerged aquatic plants obtain the raw materials for photosynthesis?
4) What would happen if:
a) The intensity of light is more
b) Pollution is more
5) How will be release of carbon dioxide in day and night?
(Class 10) (2 marks)
Answers
1. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's metabolic activities.
2. Autotrophs are known as producers because they are able to make their own food from raw materials and energy. Examples include plants, algae, and some types of bacteria. Heterotrophs are known as consumers because they consume producers or other consumers. Dogs, birds, fish, and humans are all examples of heterotrophs.
3. The raw materials for photosynthesis are carbondioxide and water. Terrestrial plants get carbondioxide from environment and water from thesoil. Aquatic plants obtain Co2 that is present indissolved form in water. Water is simply absorbed by the parts of plant submerged in water.
4. a) This is also what physicists believed would happen if the light intensity was increased. ... Classical physicists also predicted that increasing the frequency of light waves (at a constant amplitude) would increase the rate of electrons being ejected, and thus increase the measured electric current.
b) If air pollution is not controlled, by 2030 the air will become so poisonous that it will be necessary to use an oxygen kit to breathe easily. Rising air pollution will also lead to premature aging. Human exposure to air toxins will increase to a great extent if air pollution is not controlled.
5.And as global temperatures rise, scientists say the output of carbon dioxide by plants will accelerate. During daylight hours, plants take in carbon dioxide and release oxygen through photosynthesis, and at night only about half that carbon is then released through respiration.