| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.50 |
| Score | 0% | 70% |
Changes to an object's speed or direction of motion are caused by which of the following?
a force |
|
power |
|
kinetic energy |
|
work |
Force is applied to change an object's speed or direction of motion.
The pitch of the siren of an approaching ambulance changes as it approaches you. This is an example of which of the following?
reflection |
|
sound radiation |
|
refraction |
|
Doppler effect |
The Doppler effect occurs when the source or listener (or both) of sound waves is moving. If they're moving closer together, the listener perceives the sound with a higher pitch and, when they're moving apart, the listener perceives the sound with a lower pitch.
Herbivores are __________ that subsist on producers like plants and fungus.
primary consumers |
|
tertiary consumers |
|
scavengers |
|
secondary consumers |
Primary consumers (herbivores) subsist on producers like plants and fungus. Examples are grasshoppers, cows, and plankton.
Within DNA, a variety of a particular gene is called a(n):
allele |
|
homozygous |
|
heterozygous |
|
chromosome |
The gene is the base unit of inheritance and is contained within DNA. A gene may come in several varieties (alleles) and there are a pair of alleles for every gene. If the alleles are alike, a person is homozygous for that gene. If the alleles are different, heterozygous.
Heredity is the passing on of physical or mental characteristics genetically from one __________ to another.
generation |
|
family |
|
species |
|
cell |
Heredity is the passing on of physical or mental characteristics genetically from one generation to another. Heredity is made possible via large strings of chromosomes which carry information encoded in genes.