Science Grade 7 Unit 4 Review: Plant Systems and Homeostasis

What caused the behavior of the plant in the diagram above?

• Response to gravity

• Negative homeostasis

• Excessive humidity

• Lack of turgor pressure

Tags

NGSS.MS-LS1-5

Which of the following examples best represents the levels of organization from least to most complex?

• xylem cells > plant tissue > stem > shoot system > seed

• seed > shoot system > stem > plant tissue > xylem cells

• plant tissue > xylem cells > seed > shoot system > stem

• stem > plant tissue > shoot system > xylem cells > seed

What internal stimulus would cause the plant to respond as depicted?

• Exposure to too much sunlight

• An abundance of water in the stem

• Exposure to very little sunlight

• A lack of water in the stem

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Which of these is a response to an internal stimulus?

• A pine tree knocked sideways in a landslide grows upward in a bend.

• A cucumber tendril wraps around a wire.

• Guard cells of a tomato plant leaf close when there is little water in the roots.

• A sunflower turns to face the rising sun.

What must happen for a seed to emerge from the soil as a seedling?

• The seed must exert a force to push a shoot up through the soil.

• An animal searching for food must disrupt the soil.

• Another plant must die to make room for the new plant.

• The soil must erode and expose the seed to the sunlight.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Seeds that are planted upside down are still able to grow into mature plants. Which explanation best explains this phenomenon?

• The roots change into branches, and the branches turn into roots.

• The roots grow toward the force of gravity, and the shoots grow away.

• The plant will become a smaller version of a mature plant.

• Roots always grow toward the dark, and shoots grow toward the light.

Tags

NGSS.MS-LS1-5

A student places a plant in a dark room next to a growth lamp, while providing sufficient water and nutrients to ensure the plant's growth and survival. The plant will likely:

• bend towards the lamp.

• increasing its rate of photosynthesis.

• wilt and eventually dying.

• shedding all of its leaves.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6

Four students observed a wilted plant and were asked to identify the internal stimulus that caused the wilting. Their responses are shown below. Which student correctly identified the internal cause of the wilted plant?

• Student 4: Carbon dioxide concentration decreasing in the atmosphere

• Student 3: Carbon dioxide concentration increasing in the atmosphere

• Student 2: Water volume decreasing in the soil

• Student 1: Water volume increasing in the soil

Tags

NGSS.MS-LS2-1

Based on this information, what stimulus is most likely to cause the stomata to close?

• Lack of water inside plant cells

• Too much moisture in the air

• Not enough moisture in the air

• There is not enough sunlight

Reorder the following levels of organization from simpliest to most complex.

• organ system

• tissue

• organ

• cell

Tags

NGSS.MS-LS1-3