Exam 7 Practice Test

Which of the following organisms are autotrophs?

(select all that apply)

• 
• 
• 
• 
• 

Answer explanation

Autotrophs are organisms that make their own food - in most cases, this means things that undergo photosynthesis.

From the examples provided, the autotrophs are the tree and the sunflower (the others are heterotrophs!)

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which of the following organisms are heterotrophs?

(select all that apply)

• 
• 
• 
• 
• 

Answer explanation

A heterotroph is an organism that obtains its energy from other organisms.

In the examples shown, the heterotrophs are the grasshopper, frog, and fish (the others are autotrophs!)

An autotroph can also be categorized as a...

• Producer

• Consumer

Answer explanation

Autotrophs make their own energy - they can also be called producers! (Heterotrophs are consumers)

Tags

NGSS.MS-LS2-3

A heterotroph can also be categorized as a...

• Producer

• Consumer

Answer explanation

Heterotrophs get their energy from other organisms. They can also be categorized as consumers! (autotrophs are producers)

What is the primary source of energy for life on earth?

• The sun

• Water

• Carbon

• Air

Answer explanation

The sun is the primary source of energy for life on earth. It provides light energy to the producers to aid in photosynthesis.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Label the energy pyramid provided.

a

b

c

d

Primary Consumers

Producers

Secondary Consumers

Tertiary Consumers

Answer explanation

A - producers

B - primary consumers

C - secondary consumers

D - tertiary consumers

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Match the organisms provided to their place in the energy pyramid shown.

• A

• 
• B

• 
• C

• 
• D

• 

Answer explanation

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Match the provided amounts of energy to their places on the energy pyramid.

a

b

c

d

156 kJ

1.56 kJ

0.156 kJ

15.6 kJ

Answer explanation

Energy will decrease by approximately 90% (retaining 10%) when moving up the pyramid. The top of the pyramid will have the smallest amount of energy, and the bottom will have the largest.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Approximately how much energy is released when moving up from one trophic level to the next?

Example: producers to primary consumers

• 10%

• 90%

• 50%

• 30%

Answer explanation

10% of energy is kept when moving up a trophic level, which means that 90% is released.

Tags

NGSS.MS-LS2-3

When moving up an energy pyramid from one trophic level to the next, the energy that is not passed on is lost in the form of​ (a)  

• heat
• light
• sound
• ATP

Answer explanation

The energy that is released between each level is lost in the form of heat.

(Most of this energy is used to maintain homeostasis, perform metabolic functions, or reproduce)

Tags

NGSS.MS-LS2-3