7.7B Forces in Organisms Lesson

7.7B Forces in Organisms Lesson

WE WILL illustrate forces that affect motion in organisms such as the emergence of seedlings, turgor pressure, geotropism, and circulation of blood by reviewing key understandings in the Quizziz presentation.

I WILL illustrate forces that affect motion in organisms such as the emergence of seedlings, turgor pressure, geotropism, and circulation of blood by answering multiple choice questions with 100% accuracy

The emergence of Seedlings (Germination)

Under the right conditions, seeds will absorb water and swell. When the seed absorbs enough water it will exert enough turgor pressure to rip open the seed coat. This will allow the seedling to emerge.

Multiple Choice

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

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

Multiple Choice

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.

• 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.

Geotropism (Response to Gravity)

• Plants respond to the force of gravity

• The roots of the plant will always grow towards gravity

• The stem of the plant will always grow away from gravity.

Multiple Choice

A germinating seed is shown.

Refer to the image. In a germinating seed, the downward growth of roots and upward growth of leaves and

stems are the plant's responses to —

• Sunlight

• Osmosis

• Gravity

• Water

Multiple Choice

Look at the stages of growth.

Which stages represent the effects of positive and negative geotropism?

• B and C

• A and B

• C and D

• B and A

Multiple Choice

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.

Multiple Choice

The picture 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

Multiple Choice

When plants began to wilt they are experiencing a loss of water concentration inside their vacuoles. Therefore, there

is a greater amount of force being exerted by the cell walls on the plant. This effect is due to low____________.

• Oxygen Level

• Gravity

• Turgor Pressure

• Photosynthesis

Multiple Choice

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.

Multiple Choice

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

• Response to Gravity

• Negative Homeostasis

• Lack of Turgor Pressure

• Excessive Humidity

Multiple Choice

Which statement best describes the illustration?

• Plant A has less turgor pressure than Plant B

• Plant B has less turgor pressure than Plant A

• Rigidity of Plant A is less than Plant B due to turgor pressure

• Rigidity of Plant B is greater than Plant A due to turgor pressure

Multiple Choice

Look at the given images. Which image is an example of turgor pressure and why?

• Both images illustrate turgor pressure because they are both flowering plants.

• Neither image illustrates turgor pressure because the effects of turgor pressure are microscopic.

• Plant A illustrates turgor pressure because the plant is standing tall.

• Plant B illustrates turgor pressure because the plant is wilted.

Multiple Choice

Given the images below, which best illustrates the positive effects of turgor pressure?

Circulatory System (Heart pumps the blood)

• The heart contracts (beats) and squeezes out blood.

• This pushes the blood along the arteries moving away from the heart.

• Blood returns to the heart through the veins

Multiple Choice

A normal heartbeat involves several steps that occur in a sequence.

What statements describe how force affects the motion of blood during a heartbeat?

• Statements 1 and 3

• Statements 2 and 3

• Statements 1, 2, and 3

• Statements 2, 3, and 4

Multiple Choice

Which of the following demonstrates an organ providing a force?

• The eye transmits information to the brain.

• The heart contracts and expands to move blood.

• The kidney filters waste from blood.

• The skin protects other organs from damage.