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Key definitions 
Compound 
- 
anything created through the union of components 
Carbon 
- 
a chemical element that is not metal 
Unique 
- 
being able to be easily recognized from other objects in its class or type 
Vital 
– 
very important
 
Substance 
- 
a particular kind of matter with uniform properties.
Cells 
- 
the smallest unit that can live on its own, which comprises all living things as well as the body's tissues
Photosynthesis 
- 
chemical compound synthesis using radiant radiation, particularly light
Presence 
- 
the quality or fact of existing 
Oxygen 
- 
a chemical substance that makes up 21% of the atmosphere on Earth
Respiration 
- 
the entry and exit of air or dissolved gases from the lungs 
Exercise 1: 
Guess the meaning of the following words and word combinations. 
chemical substance, surface, liquid state, solid, water vapor, freshwater, tasteless, odorless, transparent, 
organisms, dissolve, biochemical reactions, process, photosynthesis, energy, carbon dioxide, chemical 
equation, cellular respiration 
Exercise 2:
Answer the questions. 
1. What is photosynthesis, exactly? Create a chemical equation to describe it. 
7
CK-12, Biology: The Study of Life, retrieved 9/25/2022, 
https://flexbooks.ck12.org/cbook/ck-12-biology-flexbook-
2.0/r127/section/1.19/primary/lesson/water-and-life-bio/
)

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2. What essential ingredients go into photosynthesis? 
3. What does breathing mean? Use a chemical process to illustrate it. 
4. Describe how photosynthesis and respiration differ from one another.
Exercise 3:
Solve the crossword puzzle using the clues about the plant cell. 
1
2
3
4
5
6
7
CLUES 
ACROSS 
4 The process by which plants convert carbon 
dioxide, water, and light energy into food. 
5 A process that leads to the chemical 
transformation of one set of chemical 
substances to another.
6 The element that occurs in all known organic 
life and is the basis of organic chemistry. 
7 The plant organ where the majority of 
photosynthesis occurs. 
DOWN 
1 The substance which is involved in many 
biochemical reactions and makes up 70% of 
human body. 
2 The process, in which cells break down 
glucose in the presence of oxygen and release 
carbon dioxide, water (a product), and energy. 
3 A pigment in green plants that stores light 
energy for photosynthesis.