7th Unit 03 Plant Systems

The roots of the plant in the diagram above are exhibiting which behavior?

• Autotropism

• Hydrotropism

• Geotropism

• Phototropism

A germinating seed is shown above.

In a germinating seed, the downward growth of roots and upward growth of leaves and stems are the plant's responses to —

• sunlight

• gravity

• osmosis

• water

Tags

NGSS.MS-LS1-5

Which part of the plant above demonstrates the greatest amount of turgor pressure?

• Part A

• Part B

• Part C

• Part D

Tags

NGSS.MS-LS2-1

The picture above shows a seed germinating and growing into a young plant. Many forces are at work in the process of forming a seedling. The roots of the seedling grow downward into the soil, and the stem of the seedling grows upward above the soil.

What stimulus is the seedling responding to that causes the roots and stem to grow in opposite directions?

• Water

• Light

• Gravity

• Temperature

Tags

NGSS.MS-LS1-5

In order for an embryo plant to emerge from a seed and grow into a seedling, the seed coat must split open.

Which diagram illustrates the force exerted by turgor pressure to split open the seed coat?

• Gravity pulls down on the seed coat

• Gravity pushes up on the seed coat

• Water from the soil pushes in through the seed coat

• Water within the seed pushed out against the seed coat

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

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

• An animal searching for food must disrupt the soil.

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

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

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

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

The pictures above show a gerbera daisy that has experienced a change called wilting. Which of the statements below best describes what has happened from Picture A to Picture B?

• Water entering the plant increased the turgor pressure in the cells of the flower.

• Water entering and leaving the cells of the flower at equal rates kept turgor pressure equal.

• Lack of water in the soil decreased the turgor pressure in the cells of the flower.

• Lack of sunlight on a cloudy day caused the flower to lose turgor pressure.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

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

Living organisms are made up of cells. Cells are organized at different levels to form very complex living organisms like your body. Each level has a specific role or job to perform.

Which of the following lists these levels in the correct order of organization from the simplest to the most complex?

• Cells, tissues, organs, organ systems, organisms

• Organisms, organ systems, organs, tissues, cells

• Tissues, cells, organs, organisms, organ systems

• Organs, organ systems, organisms, cells, tissues

Tags

NGSS.MS-LS1-3