Unit 5 Part 2 - Stimulus and Response

The picture above shows a seed germinating and a seedling growing in the ground.  Many forces are at work on the seedling.  The stem of the seedling grows upward away from the ground and the roots of the seedling grow down into the soil.

After germination, what force is the seedling responding to that causes both the stem and roots to grow in these directions?

• gravity

• light

• pressure

• water

Tags

NGSS.MS-LS1-5

An increase in turgor pressure causes a seed coat to split so the seedling can emerge.

Which diagram shows the force exerted by turgor pressure on the seed coat?

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Which of the following is the plant’s response to an internal stimulus that helps the plant maintain internal balance?

• sunflower turns to face sun

• cucumber vine wraps around a wire

• pine tree knocked sideways grows upward in a bend

• a tomato plant leaf wilts when its lacking water

Tags

NGSS.MS-LS1-5

A lizard moves to the sunlight in the morning. In the evening, they sit under plants and rocks. How does this behavior help them maintain homeostasis?

• attracting mates

• confusing predators

• preventing dehydration

• regulating body temp

Someone is hungry and has hunger pains. Is this internal or external?

• internal

• external

What stimulus causes a plant to grow towards the window?

• internal stimulus of turgor pressure

• external stimulus of light

• external stimulus of gravity

• internal stimulus of temperature

A student observes two microscopic organisms, a euglena and an amoeba. She noticed that the euglena swam up to the light but the amoeba did not. What was the students observation?

• amoebas can only move side to side not up and down

• amoebas do not respond to the stimulus of light by moving

• amoebas move too slowly to observe through a microscope

• Amoebas only respond by moving when stimulated by hunger

What type of response does a deer have when it encounters a coyote?

• The deer will have a flight response to the coyote in order to find a new food source. 

• The deer will have a fight response to the coyote in order to protect themselves from the predator

• The deer will have a flight response to the coyote in order to protect themselves from the predator.

• The deer will have a fight response to the coyote in order to protect their food source from the coyote.

Tags

NGSS.MS-LS2-2

Which way do the roots grow in geotropism/gravitropism?

Which way do the leaves/stem grow?

• down (positive), up (negative

• up (positive), down (negative)

• down (negative), up (positive)

Which question is this experiment most likely designed to answer?

• Does air pressure affect root growth

• Does gravity affect the direction of plant growth?

• Does turgor pressure affect the rigidity of plant cells?

• Does radiant light affect the direction of root growth?

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1