Plant Systems Level of Organization

Leaves are composed of vascular tissue that brings water in so that ground tissue can conduct photosynthesis. Based on this information, what level of organization describes leaves?

• Tissue

• Organ

• Organ system

• Organism

Trees that grow in a forest tend to grow very tall, with few branches. The same species of tree grown in an open area tends to grow shorter and wider, with many branches. The stimulus responsible for these different growth patterns is the amount of -

• wind striking the tree

• light reaching the tree

• nutrients in the soil

• water in the ground

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Seeds are the offspring of mature plants. If a seed germinates and survives, it will grow to become a mature plant. Based on this information, what level of organization describes seeds?

• Tissue

• Organ

• Organ system

• Organism

Plants are complex organisms that are composed of multiple layers of organization. Which of the following best represents the organization of the root system from most complex to least complex?

• root system → root → phloem → cell

• root system → cell → phloem → root

• root system → phloem → root → cell

• root system → root → cell → phloem

Tags

NGSS.MS-LS1-3

The diagram illustrates a seed germinating. Many forces, including responses to moisture, light, temperature, and gravity are at work in this process.

Which of the following correctly describes two of the seedling's responses to stimuli?

• I is negative to light, and III is positive to gravity.

• IV is negative to temperature, and II is negative to gravity.

• II is negative to light, and III is positive to gravity..

• II is positive to gravity, and IV is positive to moisture.

Tags

NGSS.MS-LS1-5

A bean plant grown on Earth and a bean plant grown aboard the International Space Station are MOST likely to differ in the —

• color of their leaves

• shape of their root systems

• nutrients they need to survive

• way they respond to direct light

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Frank was out of town for a few days and when he returned, he noticed that his plant was very wilted. He watered the plant and put it in the sun. A few hours later, he noticed that it the leaves on the plant had perked up and looked fine again. The image shows the plants before and after the water and exposure to sunlight.

Why did this occur?

• The plants needed the water to help the leaves undergo photosynthesis.

• The plants needed to be put in the sun so the sunlight could attract the plant.

• The plants needed to be outside so it could be affected by the gravity of the Earth.

• The plants needed the water so the cells could expand and keep the plant upright.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6

The diagram illustrates a seed germinating. Many forces, including responses to moisture, temperature, and gravity, are at work in this process.

Which part of the seedling demonstrates a negative response to gravity?

• I

• II

• III

• IV

If the top portion of plants grow "up," explain why a small tree on a hillside does not grow straight out from the hillside.

• The tree is growing toward water.

• The tree is resting on the hillside.

• The tree is leaning toward the top of the hill so rain won't wash it off.

• The tree's roots and trunk are growing in response to gravity.

Tags

NGSS.MS-LS1-5

Students observed a plant left by a window over several days. The plant was watered daily. After three days, the plant began to grow towards the window as shown in the picture.

Which of the following best explains the student’s observations?

• Heat from the Sun caused the plant to grow towards the window.

• The plant is leaning towards the window to get fresh air.

• The plant is responding to the stimulus of sunlight.

• The plant is responding to water in the air and growing towards it.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1