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Chapter 8-2
Photosynthesis: An Overview
11
Biology
10th Grade
11/14/2008

Additional Biology Flashcards

 


 

Cards

Term

 

 

 

What did the experiments of

van Helmont, Priestly, and Ingenhousz

reveal

about how plants grow?

Definition

 

 

The experiments performed by van Helmont, Priestly, Ingenhousz, and other scientists reveal that in the presence of light, plants transform carbon dioxide and water into carbohydrates and release oxygen.

Term

6Co2 + 6H2light→ C6H12O6 + 6O2

 

Carbon dioxide + water light →  sugar + oxygen

 

Photosynthesis uses the energy of sunlight to convert water and carbon dioxide into oxygen and high-energy sugars. 

Definition

 

 

 

 

What is the overall equation

for photosynthesis?

Term

 

 

Plants gather the sun's energy with light-absorbing molecules called pigmentsThe plants' principal pigment is chlorophyll

 

 There are two main types of chlorophyll:  chlorophyll a and chlorophyll b.

Definition

 

 

What is the role

of light and chlorophyll

in photosynthesis?

 

Term

 

 

 

photosynthesis

Definition

 

 

A process by which plants and some other organisms use light energy to power chemical reactions that convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches (pp 68, 204)

Term

 

 

 

pigment

Definition

 

 

 

 

Any light-absorbing colored molecule used in trapping light energy(pg 207)

Term

 

 

 

 

chlorophyll

Definition

 

 

A principal pigment of plants and other photosynthetic organisms; captures light energy (p. 180).

Term

 

 

 

 

Why are light and cholorophyll

needed

for photosynthesis?

Definition

 

 

Light is a form of energy.  Chlorophyll absorbs the light energy and transfers it into electrons within the chlorophyll molecule.  With the raised level of electrons in the chlorophyll molecule - this high energy electrons make photosynthesis work. 

Term

 

 

 

Pg 207 -- Chlorophyll absorbs light very well in blue and red regions of the visible spectrum.  However, chlorophyll does not absorb light well in the green region of the spectrum, which is why plants are green. 
  
Plants also contain red and orange pigments such as carotene that absorb light in other regions of the spectrum. 

 

 

Definition

 

Why are plants green?

Term

 

 

Jan van Helmont

Definition
  • Scientist that devised an experiment to find out if plants grew by taking material out of the soil.
  • 5 years, the seedling, which by then was a small tree, had gained about 75 kg.
  • conclusion was that most of the mass the plant gained had come from water.
Term

Joseph

Priestley

Definition
  • Scientist that discovered that oxygen, produced by a live sprig of mint trapped under a glass bell jar, would allow a candle to burn longer.

     

     

Term

 

Jan

Ingenhousz

Definition
Scientist that demonstrated that plants will only produce oxygen when exposed to light.
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