Photosynthesis, Stimuli & Response Review
Stimulus
Something that causes a reaction
Chemical Reaction
The process by which one or more substances change to produce one or more different substances.
How does a plant lose water through transpiration?
Water is released and evaporated through the stomata in leaves.
What is the chemical equation for photosynthesis?
6CO2 + 6H2O + Sunlight -> C6H12O6 + 6O2
Photosynthesis
A chemical reaction during which plants convert radiant energy from the Sun to chemical energy; a reaction that converts carbon dioxide and water to sugar (glucose).
Phototropism
A plant's growth in response to light or radiant energy.
Geotropism
A plant's growth in response to the force exerted upon it by gravity.
Which of the following is an example of the effects of geotropism?
A potted plant falls on its side, but its roots still grow downward.
Fight or Flight
A response to a perceived harmful situation
Glucose
A simple sugar molecule with stored chemical energy used by plants as their energy source; one of the main products of the photosynthesis process.
Products
A substance produced during a chemical reaction.
Reactants
A substance that takes part in and undergoes change during a reaction.
Response
Any behavior of an animal as a result of internal or external stimulus
Where photosynthesis takes place
Chloroplasts
Radiant Energy
Energy from the Sun that reaches Earth as visible light, ultraviolet light, and infrared radiation (heat).
Chemical Energy
Energy stored in the particles that make up food, fuel, and other matter, which is released during a chemical reaction such as burning wood, or the reactions that occur in the cells of organisms.
Turgor Pressure
Force of water molecules against the cell wall that allows plants to stand up straight.
What are the products of photosynthesis?
Glucose and oxygen
A plant's roots will always grow in a downward direction. The downward direction of root growth is a response to what force?
Gravity
When a seedling emerges upright from the soil, which force is it overcoming?
Gravity
Photosynthesis
Green plants capture and store light energy from the Sun through the process of -
Plants grow upward against the downward force of gravity in a process known as _______.
Negative Geotropism
How is the process of photosynthesis considered a chemical equation?
Photosynthesis begins with molecules of water and carbon dioxide and when light is added the molecules break apart to rearrange into new molecules of glucose and oxygen.
Glucose
Photosynthesis produces the chemical energy that a plant's cells need. What form does this chemical energy take?
How does gravity affect a plant's growth?
Plants stems grow upward against the downward force of gravity in a process known as geotropism. Plant roots grow toward the force of gravity. Seedlings must have enough stored energy to work against the force of gravity to break through the surface of the soil.
Convert radiant energy into chemical energy
Plants use photosynthesis to meet their survival needs by enabling them to -
The form in which chemical energy is stored during photosynthesis
Sugar (glucose)
What are the reactants of photosynthesis?
Sunlight (radiant energy), water, and carbon dioxide
Radiant energy
The Sun contributes to photosynthesis by providing plants with -
Chlorophyll
The green pigment involved in photosynthesis
Stability
The state or quality of being stable
Homeostasis
The tendency of a system to maintain internal stability or balance
Why is photosynthesis important to humans?
This process provides food for nearly all life on Earth and it provides the oxygen humans need to breathe
Where does carbon dioxide enter and oxygen leave the plant?
Through the stomata in the plant's leaves
A wilted plant will return to an upright position by using which type of force?
Turgor pressure
What is inside of a cell that helps the cell maintain its size and shape?
Turgor pressure
Oxygen
What gas do plants release as a result of photosynthesis?
Describe what happens as a plant's turgor pressure increases and decreases.
When plants do not have enough water, the turgor pressure inside of the cell decreases, and the cell shrinks and loses its shape. A decrease in turgor pressure causes a plant to wilt. When a plant has enough water, the turgor pressure is high inside of the cell. High turgor pressure helps the cell keep its shape and supports the plant to stand straight and tall.
When turgor pressure inside of a plant's cells decreases, the plant begins to ______.
Wilt
Thigmotropism
growth of a plant in response to touch
Geotropism
oriented growth with respect to the force of gravity
