T1 Photosynthesis and respiration Flashcards
(24 cards)
Define interdependent
Two or more things depend or rely on each other
What is the most important way that organisms interact?
In their search for energy or food
Define radiant energy
Energy contained in electromagnetic radiation
What is the ultimate source of energy?
The sun
Define photosynthesis
Radiation energy is converted into potential energy which is stored in food and oxygen is released
Can organisms use the radiant energy from the sun directly?
No. The energy must be changed into a form that can be used
Can energy be destroyed?
No, but it can be converted from one form into another.
Define chemical reactions
Chemical changes that take place when two or more compounds react and form new substances
What are cells?
The smallest units of living organisms
What is chlorophyll?
Green pigment in plant cells that absorbs radiant energy
What is potential energy?
Energy that is stored in an object or system
What does the word photosynthesis mean?
Photo = light, synthesis = to make. Plants make food in a series of chemical reactions
What do plants require in order to photosynthesise?
Sunlight
Water
Carbon dioxide
How do plants absorb carbon dioxide?
Through their leaves
What product do plants produce from sunlight and water using radiant energy?
Glucose
What is glucose?
A simple sugar that a plant uses for food
What waste product forms as a result of photosynthesis?
Oxygen
What type of energy is found in glucose?
Potential energy. When animals eat plants, they consume the energy that the plants have made during photosynthesis
What other chemical compounds do plants change glucose into?
Starch
Cellulose
Name four examples of starch stored in plants
Apples, potatoes, rice and carrots
Many glucose molecules joined together to form…
Starch
What is cellulose?
Part of the cell wall of plant cells. A structural material that provides clients with support — the reason trees can grow so tall.
The sugars that are produced during photosynthesis transformed into other chemical compounds. Give the names and functions of two examples of these chemical compounds
Starch. Stored for energy
Cellulose. A structural material that provides plants with support
Write down the word equation photosynthesis
chlorophyll
Carbon dioxide + water ——– > glucose + oxygen
sunlight
