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?