7.13AB External and Internal Stimuli

Which of the following is an example of a plant responding to the external stimulus of gravity?

• A seedling growing towards a sunny window.

• Plant roots growing down into the soil.

• Flowers producing nectar to attract bees.

• A potted plant wilting when it dries out.

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112.19.b.13.A

112.19.b.13.B

The flowers of the snow buttercup face one direction in the morning, move throughout the day, and face the other way by evening. Most likely this is a response to which stimulus?

• Sun passing through the sky.

• Daily rainfall patterns.

• Daily rise and fall in temperature.

• Physical contact with passing animals.

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112.19.b.13.A

112.19.b.13.B

What external stimulus is most likely to result in a more rapid heartbeat in an animal?

• Decreased temperature

• Strong southerly winds

• Presence of a predator

• Lack of water

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112.19.b.13.A

112.19.b.13.B

Which of the following is a change that the body will undergo to prepare for fight or flight in response to a stressful stimulus?

• Less blood to the brain

• Sweating increases

• Heart rate decreasaes

• Muscles relax

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112.19.b.13.A

112.19.b.13.B

Which of the following is a response of the body when infected with a virus?

• Decreased heart rate

• Craving salty foods

• Blood diverted to muscles

• Increased body temperature

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112.19.b.13.A

112.19.b.13.B

When an animal is thirsty, it responds by -

• eating food.

• drinking water.

• blinking rapidly.

• sweating excessively.

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112.19.b.13.A

112.19.b.13.B

Select the correct response to the external stimulus. A crocodile quietly stalks its prey, a wildebeest, drinking at a water hole. The wildebeest suddenly sees the crocodile approaching. The wildebeest's body responds by-

• shedding thick fur.

• blinking rapidly.

• increasing the heart rate.

• requiring more food.

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112.19.b.13.A

112.19.b.13.B

A student places a plant in a dark room next to a growth lamp, while providing sufficient water and nutrients to ensure the plant's growth and survival. The plant will likely respond by-

• bending towards the lamp.

• wilting and eventually dying.

• shedding all of its leaves.

• increasing its rate of photosynthesis.

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112.19.b.13.A

112.19.b.13.B

When a plant wilts due to lack of water, it is responding to which of the following internal stimuli?

• Decreased water pressure within the plants cells.

• Lack of nutrients carried by water in the plant.

• Decreased rate of photosynthesis in the stem.

• Increased storage of glucose in the leaves.

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112.19.b.13.A

112.19.b.13.B

Stunted growth, or limited growth of an animal can be a response to-

• overexposure to sunlight.

• lack of nutrients in diet.

• eating a plant-based diet.

• living in a hot climate.

Tags

112.19.b.13.A

112.19.b.13.B