1. Bell work 71-80
7th Grade

2. #71 A stronger trait that can cover a weaker trait is called _______.
Photosynthesis is essential to plants because it produces ___________.
An organism that requires food to survive must perform _______ to obtain energy.
What process enables cells to divide and produce two new cells identical to the original cell?
In an experiment, which is the one variable that is purposely changed to test a hypothesis?
dominant
glucose
digestion
mitosis
Independent variable

3. #72 7th grade
The respiratory system brings oxygen into the body. This oxygen is used in what cell process?
List the organization of life in order of increasing complexity.
Name the four pathogens.
Repeated exposure to the sun can lead to ________.
Name the order of the major organs of the digestive system.
respiration
Cell, tissue, organ, organ system
Protist, virus, fungi, bacteria
Skin cancer
Mouth, esophagus, stomach, small intestine, large intestine, rectum

4. #73 7th grade
The purpose of repeating an experiment is to ________________.
What are the levels of organization of ecosystems in order from smallest to largest?
What is the smallest particle of an element?
When two or more substances are in the same place but not chemically combined, they form a(n) ___________.
All metals except mercury are ____________.
Confirm conclusions
Species, population, community, ecosystem
atom
mixture
Solid at room temperature

5. #74 7th grade
Table salt has the formula NaCl. Which elements make up table salt?
A low pH value tells you that a solution is a(n) __________.
Who was Alfred Nobel?
What does pH mean? _________.
What are protons made of?
Na and Cl
acid
Created Nobel Prize
Negative log of the hydrogen ion concentration
quarks

6. #75 7th grade
Leaves give off water vapor during the process of __________.
What stimulus is a cat responding to when it hunts for food?
Whenever mechanical energy is converted into another form, some energy is transformed into _____.
If an animal is an ectotherm, it has _____________________________.
The process following evaporation in the water cycle, in which water returns to the surface, is called _________.
transpiration
hunger
heat
A body incapable of producing internal heat
Precipitation

7. #76 7th grade What are the 3 parts of the nerve cell?
- body, axon, and dendrites
What are the four major organs of the excretory system?
- kidneys, ureters, bladder, urethra
What organ functions as both respiratory and excretory?
- lungs
What is the dome-shaped muscle that aids in the breathing process?
- diaphragm
What is the trachea?
- the windpipe

8. # th
1. What are the four kinds of pathogens that cause disease in humans?
(bacteria, viruses, fungi, protists)
What is the definition of a disease?
(a condition that does not allow the body to function normally)
3. What are the two categories that diseases are divided into?
(infectious and noninfectious)
4. What is the giant machine called that smashes atoms together to discover new elements?
(particle accelerator)
5. What unit are large explosions measured in?
(tons of TNT)

9. #78 7th grade 1. What is the purpose of the immune system?
(protecting the body from pathogens)
2. Which part of the immune system protects the body?
(white blood cells)
3, Is the common cold an infectious or noninfectious disease? Why?
(infectious—caused by a virus)
4. Is diabetes an infectious or noninfectious disease? Why?
(noninfectious—caused by an inability to either produce or use insulin)
5. Which variable is purposefully changed by the scientist?
(independent)

10. #79 7th grade
1. Who is given credit for making the 1st periodic table?
(Dmitri Mendeleev)
2. What is the variable that changes because of the independent variable?
dependent variable
3. What are the terms that means living and non-living?
(biotic = living, abiotic = non-living)
4. Is Parkinson’s disease an infectious or a noninfectious disease?
(noninfectious)
5. What is a toxin?
(poison)

11. #80
What would I have if I have a noninfectious disease that couldn’t control the level of sugar in my system?
(diabetes)
What would I have if I have an infectious diseases that is common to the feet?
(Athlete’s foot)
What would be affected if I had Asthma?
(respiratory system)
What would I have if I have tremors developing?
(Parkinson’s Disease)
What is a noninfectious disease that I can contract from UV light?
(Skin Cancer)