7th Grade TEKS 7.6, 7.7, 7.12, 7.13, 7.14

Researchers are investigating the processes that happen during digestion. Which answer choice describes only a physical change during digestion?

• Hydrochloric acid in the stomach breaks down proteins

• The enzymes in the saliva start the digestion of starches before food into small pieces

• chewing in the mouth breaks food into small pieces

• bacteria in the intestines convert dietary fiber into fats

In a germinating seed, the downward growth of roots and upward growth of leaves and stems are the plants responses to ............

• sunlight

• gravity

• osmosis

• water

Tags

NGSS.MS-LS1-5

A particular peach tree produces peaches that are more resistant to disease than other peaches. What method would reproduce these exact peaches?

• use bees to pollinate the flowers

• reproduce by cross-pollination of different peach trees

• increase the diversity in the peach tree

• ensure the peach tree reproduce asexually

Tags

NGSS.MS-LS3-2

If a nerve cell stopped functioning, the cell would.....

• start producing oxygen

• begin dividing into more cells

• stop sending signals to the brain

• become a different type of cell

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-3

Which statement best explains what happens to a leaf when it has lost much needed water?

• its turgor pressure decreases

• its atmospheric pressure decreases

• its rate of transpiration increases

• its rate of photosynthesis increases

Tags

NGSS.MS-LS2-1

Forces affect motion in living and nonliving things. In a human, swallowed food moves down the esophagus into the stomach, even if the human is upside down doing a handstand. Which force moves food through the esophagus into the stomach?

• frictional force in the esophagus moves food through the esophagus

• gravitational force pulls food through the esophagus

• magnetic force in the stomach pulls food through the esophagus into the stomach

• push force from contractions of the esophagus moves food through the esophagus

During exercise, the cardiovascular system works together with the respiratory system to........

• maintain blood pressure

• remove carbon dioxide

• produce red blood cells

• filter out waste products

Which stimulus causes a responding plant to demonstrate phototropism?

• intensity of light

• direction of light

• length of day

• time of day

Which of these is the BEST demonstration of heredity?

• the transfer of learning from one generation to the next

• the transfer of visible features from one generation to the next

• the passage of dominant genes from one generation to the next

• the passage of genetic information from one generation to the next

Both the stomach and the small intestine are involved in the digestion of food. The churning of food by stomach muscles and peptidase enzymes in the small intestine both break food molecules into smaller molecules.

Which statement best describes changes to food during digestion?

• The muscle contractions result in chemical changes, while the action of the peptidase results in physical changes.

• The muscle contractions and the action of the peptidase both result only in physical changes.

• The muscle contractions result in physical changes, while the action of the peptidase results in chemical changes.

• The muscle contractions and the action of the peptidase both result only in chemical changes.