Checkpoint #2 review

Researchers are investigating processes that happen during digestion.

Which answer choice describes only a physical change during digestion?

• Hydrochloric acid in the stomach breaks down proteins

• Chewing in the mouth breaks food into small pieces

• Enzymes in saliva start the digestion of starches before food is swallowed

• Bacteria in the intestines convert dietary fiber into fats

Tags

112.27.b.6.C

Many processes occur in the digestive system.

Which process is best classified as a physical change?

• Saliva converting the starch molecules in crackers into simple sugars

• Digestive enzymes breaking down proteins into smaller fragments

• Bacteria converting lactose into simple sugars in the intestines

• Teeth grinding an almond into smaller pieces in the mouth

Tags

112.27.b.6.C

Digestion is the process of breaking down food and can be an example of a chemical change or physical change. The chewing and mashing of food is an example of a __________________________.

• Physical Change

• Chemical Change

• No Change

• Hungry Hungry Hippo

breaking down food with enzymes

• chemical digestion

• esophagus

• peristalsis

Which plant would be wilted or limp?

• A

• B

Which plant would be stiff and rigid?

• A

• B

A tropism in which a plant bends towards the sun throughout the day.

• Geotropism

• phototropism

• thigmotropism

• Hydrotropism

The tropism in which a plant responds to the stimulus of gravity.

• Geotropism

• phototropism

• thigmotropism

• hydrotropism

What plant cell process is being shown in this video after the water is added to the soil?

• The plant cell vacuoles are filling with water and increasing turgor pressure.

• The plant cell vacuoles are losing water and decreasing turgor pressure.

• The plant cell vacuoles are loosing water and starting to collapse from gravitational pressure.

• The plant cell vacuoles are responding to light and forcing the plant to grow upwards.

Which type of plant tropism response is shown in the video? Hint: Even though the plant is laying on its side, it starts growing up (away from the Earth's gravitational force).

• Phototropism

• Geotropism

• Thigmotropism

• Hydrotropism