Tropisms and Homeostasis Review

What makes a tropism positive or negative?

• Positive = movement towards stimulus, Negative = movement away from stimulus

• Negative = movement towards stimulus, Positive = movement away from stimulus

• Who cares? It doesn't matter whether it is positive or negative

• Positive = when a plant is happy, Negative = when a plant is sad

Turgor pressure causes which of the following?

• Roots to grow down due to gravity

• A plant to grow towards the light

• A wilted plant to stand upright

• Leaves to fall off of a tree

Which of the following is the best example of phototropism?

• The roots of a plant grow towards water.

• A plant in a dark room grows towards the light from a window.

• A venus flytrap closes when an insect lands inside.

• A wilted stem begins to stand upright.

What is geotropism?

• Plants maintain a stable internal condition.

• Plants change the direction they face in response to the sun.

• Vines grow up a wall in response to touch.

• Roots grow downwards in response to gravity.

Sunflowers in a field change the direction that they face throughout the day. Which external stimulus are they responding to?

• Light from the sun

• Gravity

• Turgor Pressure

• Water

Which of the following describes geotropism?

• Seeds push up through the soil

• Roots grow down, stems grow up

• Plants turn towards light

• Plants begin to wilt

Which of the following represents phototropism?

• a plant growing towards the window in a dark room

• roots growing in multiple directions

• stems of plants respond to touch

• a seed pushes up through the soil

What force causes roots to grow downwards?

• Gravity

• Light

• Water Pressure

• Wind

When a plant wilts, which of the answer choices is the best description of that process?

• water entering the plant increases the turgor pressure

• water enter and leave the plant at the same rate keeps turgor pressure equal

• lack of water in the soil decreases the turgor pressure

• lack of sunlight decreases the turgor pressure

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

What causes this behavior in the plant?

• lack of turgor pressure

• response to gravity

• excessive humidity

• negative homeostasis

Tags

NGSS.MS-LS1-5