Internal and External Stimuli

Roots grow downward in the soil in response to -

• gravity

• sunlight

• water

• wind

Tags

NGSS.MS-LS1-5

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

• clinking rapidly

• increasing the heart rate

• requiring more food

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

• bending towards the lamp

• wilting and eventually dying

• shedding all of its leave

• increasing its rate of photosynthesis

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6

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

• decreased water pressure within the plant cells

• lack of nutrients carried by water in the plant

• decreased rate of photosynthesis in the stem

• increased storage of 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

NGSS.MS-LS2-4

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.MS-LS1-3

Many birds migrate long distances when the seasons change. Which of the following is an environmental stimulus that would signal to the birds the changing seasons?

• changes in the length of daylight

• increase in the population of edible plants

• decreased number of offspring per hatching event

• increase in annual precipitation levels

Which of the following is a response to smelling food?

• rapid blinking

• excessive sweating

• increased hunger

• sensitivity to sound

Pain is a stimulus in animals that leads t o responses which help the animal to-

• find food in the habitat

• recuperate after exercise

• avoid harmful sutations

• fight serious infections