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Levels Of Organization
Test Description: This is a 7th grade study guide for the CRCT levels of organization topic.
Instructions: Answer all questions to get your test result.
1) Which organ system carries oxygen to the cells of the body?
A
circulatory
B
nervous
C
respiratory
D
digestive
2) Which list below correctly shows the levels of organization in an organism from left to right?
A
organs - tissues - systems - cells - organism
B
tissues - cells - systems - organs - organism
C
cells - tissues - organs - systems - organism
D
organism - cells - tissues - organs - systems
3) Which cell structure allows a plant to carry out photosynthesis?
A
nucleus
B
cell wall
C
chlorophyll
D
chloroplast
4) The organ system that uses blood to carry nutrients and oxygen to the cells of the body is the
A
urinary system.
B
circulatory system.
C
cardiac system.
D
reproductive system.
5) What is the job of mitochondria in plant and animal cells?
A
to break down food for energy
B
to store the cell 's genetic information
C
to control what enters the cell
D
to break down wastes
6) White blood cells help protect the body from illness by engulfing diseasecausing organisms. Which organ system produces white blood cells?
A
urinary system
B
skeletal system
C
circulatory system
D
immune system
7) What is formed by a group of cell s and tissues that work together to carry oul a specific function?
A
organ system
B
orgamsm
C
organ
D
organelle
8) One organ system includes the kidneys, bladder, and urethra. What is the purpose this system?
A
to transport materials to cells
B
to protect the body from disease
C
to remove wastes from the body
D
to produce offspring
9) Which organ system removes carbon dioxide wastes produced by cells from the body?
A
digestive
B
nervous
C
respiratory
D
circulatory
10) Which of these organelles breaks down food to release energy the cell can use?
A
cytoplasm
B
ribosomes
C
mitochondrion
D
endoplasmic reticulum
11) Which cell structure is MOST responsible for controlling what materials enter and leave the cell?
A
mitochondrion
B
cytoplasm
C
nucleus
D
cell membrane
12) Which organ system in humans makes sperm cells?
A
the female reproductive system
B
the nervous system
C
the excretory system
D
the male reproductive system
13) Which structure is the simplest level of organization in humans?
A
organ
B
system
C
cell
D
tissue
14) What fluid fills most of the in side of a cell?
A
chlorophyll
B
cytoplasm
C
plasma
D
water
15) Which of these organ systems controls and coordinates most body functions?
A
excretory
B
digestive
C
reproductive
D
nervous
16) Which of these processes of organisms needs carbon dioxide from the atmosphere?
A
digestion
B
denitrification
C
photosynthesis
D
cellular respiration
17) Which pair of organ systems work together to fight viral diseases such as the flu?
A
digestive and reproductive
B
circulatory and immune
C
respiratory and nervous
D
immune and excretory
18) Which organ system breaks down food into the nutrients cells need?
A
digestive
B
nervous
C
immune
D
excretory
19) What level of organization is made up of a group of similar cells that perform a specific function?
A
system
B
tissue
C
organ
D
organelle
20) Which of the following cell processes does NOT depend on nutrients?
A
growth
B
response to stimuli
C
making needed materials
D
cell division
*select an answer for all questions
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