Which is a true statement about an ecosystem?

Plants and animals interact in it.

Which of these would make an ecosystem unbalanced?

having too many of one kind of animal or plant

How can parasites change an ecosystem?

They can kill off a kind of plant.

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Life Science Domain

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pearsonsuccessnet. Life Science Domain Test review. Grade 4

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Questions 17

Answers

1
Which change would affect an ecosystem slowly?
earthquakes
fires
flood
succession
2
What is the main job of a flower?
creating spores
protecting the plant
photosynthesis
helping a plant reproduce
3
What are two major parts of the central nervous system?
connective tissue and neurons
neurons and cytoplasm
brain and spinal cord
brain and nucleus
4
How do organisms transfer energy in a food chain?
by digesting food
by making food
by storing food
by eating and being eaten
5
What is the largest classification group that scientists use?
class
genus
kingdom
species
6
What are two main functions of the skeletal system?
eating and digesting
thinking and speaking
breathing and coughing
support and protection
7
How do plants get food?
They make their own food.
They get food from flowers.
They take energy from decomposing plants an animals.
they get energy from other plants.
8
Which is a true statement about an ecosystem?
It contains only living things.
Plants and animals interact in it.
It contains only one population of animals.
Its populations remain the same.
9
Which one of the following is the control center for a cell?
nucleus
cytoplasm
chloroplast
virus
10
What is the smallest unit of a living thing?
a cell
a virus
an organ
a tissue
11
Which kingdom lives on land and needs to get its food from other living or nonliving things?
plant
animal
fungi
protist
12
Why would a scientist classify a bird as a vertebrate?
It can live on the land.
It can breathe air.
It has a backbone.
It has a mouth.
13
Look carefully at the illustration below. What does this illustration show?
the circulatory system
the respiratory system
the muscular system
the nervous system
14
Which of these would make an ecosystem unbalanced?
having both plants and animals
having shelter for every animal
having too many of one kind of animal or plant
having different kinds of plants
15
How can parasites change an ecosystem?
They can kill off a kind of plant.
They can create new plants.
They can help the host animal survive.
They can change the water supply.
16
Which of the following would an animal learn from experience?
how to catch food
how to hibernate
how to migrate
how to get energy from stored body fat
17
Look carefully at the illustration below. What does this drawing show?
a taproot
a fibrous root
a woody stem
a stamen

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