Name: _______________________Period: ____________
Photosynthesis
Do Now #11. Plant and animal cells are different. Which organelle belongs to a plant cell, animal cell or both Word Bank: mitochondria, chloroplast, cell wall, cell membrane
PLANT BOTH ANIMAL
2. What is the function of a:
Chloroplast -
Mitochondria -
How do organisms obtain nutrition?There are 2 ways:
1. Heterotrophs
__________________ to synthesize own food
_______________ food (nutrients) produced by, or available in, other organisms
2. Autotrophs
Autotrophs ____________________________________. Also called ____________________
Plants do not need to ingest food. Sugar (nutrients) synthesized during photosynthesis
Why do living things need nutrition?
For _________________ to carry out _____________________________
What do you call the sum total of all the chemical reactions (life functions) in an organism?
___________________________________
What are some types of autotrophs?
Mostly _____________ ______________ and some single-celled organisms
o Trees, grass, bushes, photosynthetic bacteria, algae
How do autotrophs make food?
_____________________________
Photo / Synthesis
____________________ / _________________________
Purpose of Photosynthesis
...Is to create or__________________________________________________________. ___________
___________________________________________________________________________________
Some animals eat plants so they can steal the glucose made in order to make energy for themselves!
Put into words! This equation tells us…
__________________________________________
__________________________________________
__________________________________________
__________________________________________
__________________________________________
PHOTOSYNTHESIS EQUATIONS (You must know these!!!)
__________________ + ______________ + ____________ ________________ + ________________
6CO2 + 6H2O + Light C6H12O6 + 6O2
__________________________________ ________________________________ + ________
Sun’s Energy ______________________________ ( _____________)
Could Photosynthesis occur without sunlight?
Hmmmm…
1. What is the ultimate source of energy for all living organisms?
2. If photosynthesis didn’t take place, would there be oxygen to breath? Why or why not?
Where does photosynthesis take place?
In ____________________ found inside the cells of
________________.
How is light energy captured and used?
Plant cells that are green contain ___________________________ Chloroplasts contain chlorophyll…
1. What is chlorophyll?
A ___________________________________________________
_____________________________________________________
_____________________________________________________
2. Why are plants / leaves green?
Green light is ___________________________ by chlorophyll
3. What colors are absorbed best?
__________________________________________________
What is going on in the picture?
The ‘thing’ in the beaker is a green elodea plant
What are those little bubbles in the test tube?
Hmm… How can we measure the rate of photosynthesis?
Measure the amount of _______________________________!!
How?
1. Measure _________________________________________________________________________
2. Measure _________________________________________________________________________
What could speed-up or slow-down the rate of photosynthesis?
6CO2 + 6H2O + Light C6H12O6 + 6O2
Conclusions:
1. Color of Light
2. Light Intensity
3. Amount of CO2
Questions 1:
1. Predict what would happen if photosynthesis did not take place? (give two examples)
2. How could you improve the rate of photosynthesis? (Give at least 2 ways)
3. How could you slow down or even stop photosynthesis? (Give at least 2 ways)
Questions 2:
As the depth of the ocean increases, the amount of light that penetrates to that depth decreases. At about 200 meters, little, if any, light is present. The graph below illustrates the population size of four different species at different water depths.
Which species most likely performs photosynthesis?a. b. c. d.
Why?
How do plants get materials needed for Photosynthesis?
______________ - Absorb water from the ground
Where does the water go once it is absorbed?
To the ___________________
Site of _________________________________
Where _________ & ________________________ are
absorbed (reactants)
Where ______________ and _________ leave the plant (waste products)
How does water get up to the leaves?
Transpiration pull
Water evaporates though __________________________________________________
Water is drawn up from the roots and stems to replace the lost water
**Remember, water is cohesive… water molecules love to stick together. When one water molecule evaporates, all the water in the stem is pulled up!
https://www.youtube.com/watch?v=At1BJJDcXhk
Parts of leaf
*Guard cells & Stomata
Stomata – tiny openings on the bottom-side of the leaf. Where
________________ _________________ and where
__________________________________________________
__________________________________________________
Guard cells – two cells surrounding the stomata (opening).
These specialized cells _______________ and
________________ _________________________.
*How do the guard cells open and close?
When plant has lots of water, the cells become
Expanded and “bow-out.” This opens the stomata
When water is low, the guard cells deflate, and close.
How do guard cells help maintain homeostasis?
Review Questions 1. How does CO2 and O2 enter and leave the cell?
2. How does water enter and leave the cell?
3. How is sunlight captured in leaves?
4. What process takes place in leaves? And what’s the purpose?
5. How do guard cells help maintain homeostasis?