Name: _____________________________________________________
Class: ________________
4.2 Forces and Stimuli in Nature Exam
On-Level 2016 - 2017
1. (7.7 C) A carrot that has lost its water and is very flexible is an example of wilting. This happens because
of…
A. low turgor pressure
B. high turgor pressure
C. high hydrotropism
D. low hydrotropism
2. (7.7 C) Why doesn’t it matter which way you plant a seed in the ground?
A. because of geotropism, the root cells grow with gravity and stem cells grow against gravity
B. because of thigmotropism, the root cells grow with gravity and stem cells grow against gravity
C. because of geotropism, the root cells grow against gravity and stem cells grow with gravity
D. because of thigmotropism, the root cells grow against gravity and stem cells grow with gravity
3. (7.7 C) Why does celery left in your refrigerator for a long period of time, usually result in a very rubbery,
bendable celery?
A. the water in the vacuoles slowly leaves, resulting in low turgor pressure
B. the celery gets too cold in the refrigerator
C. the water in the vacuoles slowly leaves, resulting in high turgor pressure
D. none of these is correct
4. (7.7 C) When thinking about a cell having increased turgor pressure, which of the following is the best
comparison?
A. a balloon filling with water
B. a balloon animal being bent and popping
C. a water balloon having water released out of it
D. an un-inflated balloon being stretched by someone’s hands
5. (7.7C) Which of the following is the best evidence of the great amount of energy capable of being released
during the emergence of seedlings?
A. roots growing towards water
B. plants growing towards light
C. a vine wrapping around a larger tree
D. a hardwood tree growing where there was solid concrete
6. (7.13 A) Why are we able to observe a field of sunflower seeds moving with the Sun as its position changes
in the sky?
A. geotropism
B. hydrotropism
C. phototropism
D. thigmotropism
7.(7.13 A) Unfortunately armadillos are often killed by oncoming vehicles because of their previously
successful response to immediately jump in the air when threatened or startled. Which of the following
response is harming armadillos when they encounter cars?
A. their fight response
B. their flight response
C. their internal response
D. their external stimuli
8. (7.13 A) All of these seedlings are growing in one direction off to the side. Which of the following growth
responses is most likely the reason for this?
A. geotropism
B. hydrotropism
C. thigmotropism
D. phototropism
9. (7.13 B) When a dog vomits, this is due to which stimuli…
A. the external stimuli of foreign contaminants in its digestive system
B. the internal stimuli of foreign contaminants inside its digestive system
C. the external stimulus of being threatened by a bigger dog
D. the internal stimulus of being threatened by a bigger dog
10. (7.13 B) What evidence is there that viruses are internal stimuli that have a more difficult time surviving in
higher temperatures?
A. a human response, with many viruses, is an increase in body temperature
B. a person will sweat after running a mile
C. a decrease in body temperature when a virus invades
D. none of these are correct
11. (7.13 B) We know turgor pressure is a force that enables plants to grow and maintain support for their
structure. What happens when the internal stimulus of dehydration happens?
A. plants take on too much water and their vacuoles erupt
B. turgor pressure helps maintain the plant no matter how much water is in the plant
C. the plant wilts because of the lack of turgor pressure
D. the plant wilts because of too much turgor pressure
12. (7.13 B) A dog vomiting is to bacteria as __________________ is to allergens and dust.
A. mucus
B. sneezing
C. vomiting
D. fight or flight
13. (7.13 B) Animals vomit and plants wilt. These are both examples of…
A. a response to internal stimuli
B. a response to external stimuli
C. a response to all stimuli
D. none of these
14. (7.7C) When a corn seed falls to the ground upside down. Which of these shows the MOST likely way
the root and leaves will grow?
15. (7.13B) Jacob stayed home from school on Tuesday because he had chills and a fever. While resting in
bed, he suddenly began to sweat. What most likely caused his body to respond this way?
A. He was in bed with too many covers.
B. He drank too much water and his body had to get rid of it.
C. His body sensed that it was too hot and needed to cool down.
D. His brain sent a message to his body to be nervous about being sick.
16. (7.7C) Jade looks at the flower pot in her classroom and notices that it looks like the picture shown.
Which of the following actions could be taken to help the wilting flower?
A. Jade should consider leaving the plant alone as it is at optimum turgor pressure.
B. Jade should pour water into the pot to decrease the turgor pressure.
C. Jade should put the plant in direct sunlight to decrease the turgor pressure.
D. Jade should pour water into the pot to increase the turgor pressure.
17. (7.7C) A student conducts an experiment where he places a light source below a plant.
Over a three week time period he observes the plant’s growth. Which of the following would he observe at the
end of the three weeks.
A. Roots would grow up out of the pot and then down towards the light.
B. The plant would start to bend over and grow downwards toward the light.
C. The plant stem would grow up and roots would grow down.
D. The plant would wilt and die.
18. (7.7C) As a plant grows toward the sunlight to gain maximum energy through photosynthesis, it is
responding to a A. external stimulus
B. internal stimulus.
C. phototropism.
D. both a and c
19. (7.13A) Tropism is a growth or turning movement of a plant in response to A. a response.
B. a stimulus.
C. a reaction.
D. an effect.
20. (7.13A) How is phototropism beneficial to a plant?
A. It helps the plant to get the most amount of light possible.
B. It helps the plant by providing support..
C. It helps the plant to get nutrients and water that are deep in the soil.
D. It helps the plant to grow a deep roots.
.