|| 3. Photosynthesis or chlorophyll function
Green plants take carbon dioxide from the atmosphere in order to get the carbon they need.
The plant exposed to sunlight, absorbs carbon dioxide ( CO2) from the air and comes off
oxygen. This is called photosynthesis or chlorophyll function.
The green leaves have a substance called
chlorophyll. When they receive the ray of sunlight, they convert carbon dioxide into carbon and oxygen.
The oxygen back into the atmosphere and retains the carbon to produce organic matter.
4. Choose one of these words: chlorophyll, carbon dioxide or oxygen:
5. Plant sap circulation
Substances taken from the ground through the root (water and mineral salts) form the
raw sap. It rises from the roots to the leaves through the stem.
The leaves are responsible for transforming the raw sap in elaborated sap poorer in water and richer in nutrients due to the chlorophyll function. The
elaborated sap descends to the root in order to feed the plant.
6. Answer if these sentences are true or false:
Leaves, like all parts of the plant, absorb
oxygen from the environment and give off carbon dioxide. This function is called respiration.
Oxygen that plants capture when they breathe causes combustion of foods.
Plants breathe during the day and the night, but they only make the chlorophyll function during the day, because they need sunlight.
Plants expel more oxygen, thus they enrich the atmosphere.
8. Answer with oxygen or carbon dioxide:
Transpiration is the property of plants to constantly emit water vapor through their leaves.
If plants lose too much water during transpiration and do not recover it from the ground through the roots, they can dry up and die.
®Arturo Ramo García.-Record of intellectual property of Teruel (Spain)
No 141, of 29-IX-1999
Plaza Playa de Aro, 3, 1º DO 44002-TERUEL