2
Biology 172L Exam 2 with accurate detailed answers || || || || || || ||
Around 80% of animal species alive on Earth today are _______.
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Arthropods
Five shared characteristics of arthropods are:
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1. Jointed legs
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2. Exoskeleton
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3. Segmented body
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4. Bilateral symmetry
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5. Open circulatory system
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Rather than retaining circulatory fluid in a continuous system of tubes (as humans do),
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arthropods pump fluid, referred to as _______. || || || || || ||
Hemolymph
In order to grow larger in size, all arthropods must shed their exoskeletons and reform a
|| || || || || || || || || || || || || || || ||
new, larger exoskeleton. This process is called _______ or _______.
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Molting, Ecdysis ||
Some arthropods undergo ________, which is a change in body form that takes place
|| || || || || || || || || || || || || ||
during transition from immature life stages to an adult stage.
|| || || || || || || || ||
Metamorphosis
All insects in the _______ group undergo metamorphosis.
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Hexapoda
There two common types of metamorphosis, _______ and
|| || || || || || ||
_______.
Complete, Incomplete ||
Holometabolous insects undergo _______ metamorphosis. || || || ||
Complete
Hemimetabolous insects undergo _______ metamorphosis. || || || ||
, 2
Incomplete
The end where the head is:
|| || || || ||
Anterior
The rear end: || ||
Posterior
The top surface, the back:
|| || || ||
Dorsal
The bottom surface, underside:
|| || ||
Ventral
Surfaces on the side: || || ||
Lateral
The anterior end tends to be concentrated with a variety of sense organs and nervous tissue,
|| || || || || || || || || || || || || || ||
a phenomenon known as _______.
|| || || || ||
Cephalization
This embryonic tissue develops into the skin and nervous tissue:
|| || || || || || || || ||
Ectoderm
This gives rise to most muscles and organs:
|| || || || || || ||
Mesoderm
This makes up much of the gut:
|| || || || || ||
Endoderm
The _______ is a fluid or air-filled internal cavity which separates the gut from the body
|| || || || || || || || || || || || || || || ||
wall. This body cavity suspends the body organs and can act as a shock absorber.
|| || || || || || || || || || || || || ||
Coelom
It is considered a _______ if it is lined entirely with mesodermal tissue and a _______ if the
|| || || || || || || || || || || || || || || || || ||
lining is of mixed dermal origin.
|| || || || ||
True coelom, Pseudocoelom
|| ||
An animal without a coelom is called an _______.
|| || || || || || || ||
Biology 172L Exam 2 with accurate detailed answers || || || || || || ||
Around 80% of animal species alive on Earth today are _______.
|| || || || || || || || || ||
Arthropods
Five shared characteristics of arthropods are:
|| || || || ||
1. Jointed legs
|| ||
2. Exoskeleton
||
3. Segmented body
|| ||
4. Bilateral symmetry
|| ||
5. Open circulatory system
|| || ||
Rather than retaining circulatory fluid in a continuous system of tubes (as humans do),
|| || || || || || || || || || || || || ||
arthropods pump fluid, referred to as _______. || || || || || ||
Hemolymph
In order to grow larger in size, all arthropods must shed their exoskeletons and reform a
|| || || || || || || || || || || || || || || ||
new, larger exoskeleton. This process is called _______ or _______.
|| || || || || || || || ||
Molting, Ecdysis ||
Some arthropods undergo ________, which is a change in body form that takes place
|| || || || || || || || || || || || || ||
during transition from immature life stages to an adult stage.
|| || || || || || || || ||
Metamorphosis
All insects in the _______ group undergo metamorphosis.
|| || || || || || ||
Hexapoda
There two common types of metamorphosis, _______ and
|| || || || || || ||
_______.
Complete, Incomplete ||
Holometabolous insects undergo _______ metamorphosis. || || || ||
Complete
Hemimetabolous insects undergo _______ metamorphosis. || || || ||
, 2
Incomplete
The end where the head is:
|| || || || ||
Anterior
The rear end: || ||
Posterior
The top surface, the back:
|| || || ||
Dorsal
The bottom surface, underside:
|| || ||
Ventral
Surfaces on the side: || || ||
Lateral
The anterior end tends to be concentrated with a variety of sense organs and nervous tissue,
|| || || || || || || || || || || || || || ||
a phenomenon known as _______.
|| || || || ||
Cephalization
This embryonic tissue develops into the skin and nervous tissue:
|| || || || || || || || ||
Ectoderm
This gives rise to most muscles and organs:
|| || || || || || ||
Mesoderm
This makes up much of the gut:
|| || || || || ||
Endoderm
The _______ is a fluid or air-filled internal cavity which separates the gut from the body
|| || || || || || || || || || || || || || || ||
wall. This body cavity suspends the body organs and can act as a shock absorber.
|| || || || || || || || || || || || || ||
Coelom
It is considered a _______ if it is lined entirely with mesodermal tissue and a _______ if the
|| || || || || || || || || || || || || || || || || ||
lining is of mixed dermal origin.
|| || || || ||
True coelom, Pseudocoelom
|| ||
An animal without a coelom is called an _______.
|| || || || || || || ||
