Plant Stimulus

a response to a change in the enviroment is called?

• transduction

• stimuli

• receptor

• detector

When given only a small source of light, plants will grow toward the light source in a response called phototropism. Which of the following statements is true regarding phototropism?

• It is caused by an electrical signal.

• Phototropism is enhanced by removing the stomata.

• A growth increase on one side of the stem is caused by the plant hormone auxin

• A growth decrease occurs on the side of the stem facing the light caused by the plant hormone auxin.

What happens when our body temperature drops?

• Shivering,

• Salivating,

• Sweating

• Panting

When an animal has low levels of water in the body. The body sends an internal signal —

• to wait

• of hunger

• to sweat

• of thirst

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 is demonstrating a negative response to gravity and which is showing a positive response to gravit

• I is negative and III is positive

• IV is negative and II is positive

• II is negative and III is positive

• III is negative and IV is positive

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. Why did this occur (Tuirgid Pressure)

• 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

plant roots growing downward in the soil is a positive tropism. What causes the roots to grow downward?

• Gravity exerts a downward force on the roots

• light exerts a downward force on the root

• Minerals in the soil apply a downward pushing force on the roots

• Air in the soil applies a downward pushing force on the roots

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

Name the levels of organization from smallest to largest

• tissue- cell- organ-organ system-organism

• cell-tissue-organ-organ system-organism

• organism-organ system-organ-tissue-cell

Which of these can be found in a plant cell but not in an animal cell?

• chromosome

• nucleus

• chloroplast

• Cell membrane