1. Bell work 81-90
7th Grade

2. #81 7th grade What are chloroplasts? What is chlorophyll?
What are the stomata?
Why is respiration in plants?
5. What is dormancy?
to obtain the energy from the food it produces, plants must break the sugar down
organelles that contain chlorophyll in plants
a green pigment that absorbs the light energy from the sun
the openings, or pores, in the leaf
a period of inactivity for the seed before germination

3. #82 7th grade What is the function of a cell membrane?
Which organelle is the control center of a cell?
Which organelles produce most of the energy needed by a cell?
How does a bacterial cell differ from a plant or animal cell?
What organelles use energy from sunlight to produce food?
To control what enters and leaves the cell
nucleus
mitochondria
It does not have a nucleus
chlorophyll

4. #83 7th grade
An organic compound always contains the element ________________.
What does water do for a cell?
What are atoms composed of?
Which scientist was the first person to observe what are now called bacteria?
All metals except mercury are ____________.
Carbon
Helps the cell keep its size and shape
Protons, neutrons, and electrons
Anton von Leeuwenhoek
Solid at room temperature

5. #84 7th grade Which structure is the powerhouse of the cell?
Which organelle directs all activities?
Which part of the atom is negative?
Which part of the atom is positive?
In a chemical reaction, the total mass of the reactants is
Mitochondria
nucleus
Electron
proton
= to the total mass of the products

6. #85 7th grade
Leaves give off water vapor during the process of __________.
What provides shape and support for the cell and is mostly made of cellulose?
Whenever mechanical energy is converted into another form, some energy is transformed into _____.
What is the diffusion of water across a membrane?
The process following evaporation in the water cycle, in which water returns to the surface, is called _________.
transpiration
Cell wall
heat
osmosis
Precipitation

7. #86 7th grade What are the 3 parts of the nerve cell?
- body, axon, and dendrites
What organelle is the control center?
nucleus
What organelle makes proteins in the cell?
- ribosome
What organelle is the “power plant”?
- mitochondria
What is the trachea?
- the windpipe

8. #87 7th grade 1. What is mitosis?
cellular reproduction (daughter cells are identical to original cell)
What is photosynthesis?
plant uses the energy from sunlight, CO2, and water to make food
3. What is it called when “food” is broken into CO2, water, and energy?
respiration
4. What is a pathogen?
(tiny organisms that cause infectious diseases)
5. Name four sources of pathogens.
(another person, contaminated object, animal bite, environment)

9. #88 7th grade 1. What is the metric unit of volume?
milliliter
2. The prefix kilo- means ?
1000
3. What is one decameter?
10 meters
4. Which of the following is a mixture? Salt water, salad, helium, aluminum ladder
Salt water and salad
5. What are the steps to the scientific method?
observation, hypothesis, experiment, analyze data, conclusion, and report findings

10. #89 7th grade 1. What are the three basic shapes of bacteria?
round, rod shaped, spiral
2. What is the process of cell division called?
mitosis
3. What is the process called that rids the cell of waste products that would be toxic to the cell?
elimination
4. What are the self replicating genetic structures of the cell called?
chromosomes
5. What do the letters DNA stand for?
deoxyribonucleic acid

11. #90 7th grade What is the function of the mitochondria in the cell?
produce energy
2. Farmers and food companies use ___ to make milk into the many varieties of cheeses and yogurt.
bacteria
Tissues are found in living things. What is the definition of a tissue?
a group of cells with similar structure and function
4. Infer how air is changed between the time it is inhaled by a mammal and the time it is exhaled?
It contains less oxygen and more carbon dioxide
5. In the human body, the digestion of proteins takes place primarily between which two organs?
stomach and small intestine