Study Time MP4

When you chew a piece of food, your salivary glands release saliva to moisten the food allowing you to swallow the consumed food for the next step of digestion. Additionally, saliva has enzymes that begin to breakdown the starches within the food into smaller molecular components called glucose. What kind of change results from the breakdown of starch into glucose by saliva?

• Mechanical

• Physical

• Chemical

• Thermal

A non-native animal is introduced into a diverse, mature ecosystem. Assuming that the non-native animal has no natural enemies, what immediate affect will the non-native species have on the ecosystem?

• The number of native animal species will not be affected at all.

• The new non-native animals will develop new natural enemies.

• The native species will become more like the new animal. The new non-native animal will soon die out.

• The number of native animal species will decrease.

How does secondary succession help restore equilibrium to a region destroyed by a flood?

• It increases the number and types of species.

• It brings back species from extinction.

• It stops other floods from occurring.

• It decreases the rate of evolution.

Which of these types of environments is MOST LIKELY to experience the arrival of pioneer species?

• an old growth forest

• an undisturbed prairie

• an established mountain lake

• a newly formed volcanic island

The role of a pioneer species in primary succession is to change a bare habitat into one that is suitable for other organisms. A species that is responsible for primary succession in an ecosystem is MOST likely able to —

• survive any predator

• migrate during the winter

• live at high altitudes

• carry out photosynthesis

Which of the following sequences MOST likely represents ecological succession on an abandoned corn field?

• grasses - flowering plants - shrubs - native tress

• native tress - shrubs - flowering plants - grasses

• shrubs - grasses - native tress - flowering plants

• flowering plants - native tress - shrubs - grasses

Adaptations help improve an animal’s chances of survival and reproduction. They can be behavioral or structural.

Which choice describes an animal best suited for a cold environment?

• eyes and nostrils on the top half of the head, outer covering of scales

• special feet with flattened, webbed toes for climbing up smooth surfaces

• torpedo body shape for fast swimming

• two layers of fur: inner layer insulates, outer layer sheds moisture and protects from wind

Based on the image, what is the best explanation for the different variety of organisms in the two microhabitats?

• The rotting log and grassy area are in different biomes. 

• Conditions for survival are different in each location. 

• The rotting log has predators while the grassy area does not.

• There is more space in the rotting log than in the grassy area.

Wildebeests are cow-like animals with horns. They migrate in herds across Africa in search of the grasses they feed on. Wildebeests are prey for lions. A drought would MOST LIKELY cause a herd of wildebeests to —

• migrate farther than usual

• become more horse-like

• begin to prey on lions

• produce larger herds

During a landslide, many tons of rock slide down a hill in a very short time. A landslide would MOST LIKELY force animals living in the area to —

• move to a new area

• develop new adaptations

• uncover all the buried plants

• develop different types of diets