GRADE 4:
Plants use a number of absorption techniques to get the nutrients and moisture necessary for sturdy growth. As roots dive deep into the soil, they encounter air, water and nutrient reserves. In contrast, photosynthesising leaves discover sunlight and air as they rise up to the sky.
Roots act like sponges to absorb soil moisture. sunlight carbon dioxide + water ————> sugar + oxygen
Balanced symbol equation:

Use of glucose:
Glucose is used in respiration to release energy for use by the plant's cells.
It can also be turned into lipids for storing in seeds.
Glucose is used to make chlorophyll.
It is converted into cellulose for making cell walls.
Glucose is combined with nitrates to make amino acids, which are then made into proteins.
It can
Light intensity is varied by moving a lamp away from pondweed.
Apparatus- pondweed (placed in a beaker with water), lamp, ruler.

Method:
Set up the apparatus and leave for few minutes for the pondweed to adapt to the new light intensity
Count the number of bubbles given off in one minute.
Move the light, 10 centimetres away from the pondweed.
Leave for five minutes; for the pondweed to tailor the new light intensity again.
Count the number of bubbles given off in one minute.
Repeat by moving the lamp further back, with 10 cm intervals until 50 cm is