| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.25 |
| Score | 0% | 65% |
In the food chain, omnivores may be which of the following?
secondary consumers or scavengers |
|
secondary or tertiary consumers |
|
primary or secondary consumers |
|
primary or tertiary consumers |
Secondary or tertiary consumers may be omnivores.
Which of the following is not true about simple magnets?
opposite poles repel each other |
|
all of these are untrue |
|
opposite poles attract each other |
|
same poles repel each other |
Simple magnets have two poles, north and south, and opposite poles attract each other (N attracts S, S attracts N). Likewise, the same pole of two magnets repel (N repels N, S repels S). The Earth has a magnetic field and North and South Poles which enables the use of a magnetic compass to determine direction.
Plant cells are surrounded by:
neither a cell membrane nor a cell wall |
|
a cell membrane and a cell wall |
|
only a cell wall |
|
only a cell membrane |
Animal cells are surrounded by a semipermeable membrane which allows for the transfer of water and oxygen to and from the cell. In plant cells, the cell membrane is surrounded by a somewhat rigid cell wall which provides the cell structure and support.
The Earth's rocks fall into three categories based on how they're formed. Which of the following is formed by the gradual depositing of small rocks?
metamorphic |
|
igneous |
|
sedimentary |
|
granite |
The Earth's rocks fall into three categories based on how they're formed. Igneous rock (granite, basalt, obsidian) is formed from the hardening of molten rock (lava), sedimentary rock (shale, sandstone, coal) is formed by the gradual despositing and cementing of rock and other debris, and metamorphic rock (marble, slate, quartzite) which is formed when existing rock is altered though pressure, temperature, or chemical processes.
What is a major difference between the somatic and autonomic nervous systems?
one controls thinking, the other controls feeling |
|
one controls voluntary activity, one controls involuntary activity |
|
one is inherited, the other is learned |
|
each belongs to a different nervous system |
Both are part of the peripheral nervous system. The somatic nervous system sends sensory information to the central nervous system and controls voluntary actions while the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.