6th Grade Science Reviewer
Part 10 Living Things and Their
Environment
Direction: Choose the letter with the best answer. Write your answer on
your answer sheet.
1. The following are major layers
of the rainforest except _________.
A.
canopy
B.
sub-canopy
C.
understory and floor forest
D.
bedrocks *
2. These are trees that grow in
coastal saline or brackish water.
A.
mangroves *
B.
corals
C.
atolls
D.
rainforest
3. These are made of limestones
which is secreted by corals and deposited in a period of
thousands
to millions of years.
A.
mangrove swamps
B.
coral reefs *
C.
rain forest
D.
all of the above
4. Mangrove swamps are found in the ___________ area.
A.
canopy
B.
sub-canopy
C.
coastal *
D.
coral reefs
5. A biologist climbs the tallest
tree in a patch of rain forest. He is probably at the
_______ layer.
A.
canopy *
B.
sub-canopy
C.
understory
D.
floor of the forest
6. The process in which gases in
the atmosphere absorbs heat radiated from the Earth, forming a kind of
heat blanket around the Earth.
A.
atmospheric blanket
B.
greenhouse blanket
C.
greenhouse gases
D.
greenhouse effect *
7. The greenhouse effect causes
an increase in ____________.
A.
ozone
B.
oxygen
C.
carbon dioxide
D.
temperature *
8. A species whose numbers are so small that the species is threatened with extinction is called a/an ______________.
A.
extinct species
B.
threatened species
C.
endangered species *
D.
mutated species
9. An animal species that is no
longer existing.
A.
threatened
B.
endangered
C.
extinct *
D.
none of the above
10. Which of the following can
destroy coral reefs?
A.
illegal dynamite fishing
B.
collecting corals
C.
pollution
D.
all of the above *
Sir
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