External and Internal Stimuli

Roots grow downward in the soil in response to -

• Gravity

• Sunlight

• Water

• Wind

When an animal is thirsty, it responds by -

• eating food

• drinking water

• blinking rapidly

• sweating excessively

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 heart rate

• requiring more food

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

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6

NGSS.MS-LS2-1

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 f glucose in the leaves

Tags

NGSS.MS-LS1-2

Stunted 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

NGSS.MS-LS1-5

NGSS.MS-LS2-1

When an animal is infected with a virus, the body responds by creating conditions that are not favorable for the virus. It does this by -

• creating a sensation of hunger

• raising the core body temperature

• increasing sensitivity to sound

• inhibiting the sense of balance

Tags

NGSS.HS-LS1-3