Life Science Plants Exploration 3

What is the process called when plants grow toward a light source?

• Phototropism

• Gravitropism

• Hydrotropism

• Thigmotropism

How do plants primarily regulate water in their bodies?

• By opening and closing their stomata

• By growing towards water sources

• By shedding leaves

• By changing leaf color

What environmental factor might influence the percentage of stomata on a plant?

• Humidity levels

• Soil type

• Wind speed

• Animal presence

What is the stomatal index equation used for?

• Calculating the percentage of stomata on a leaf surface

• Measuring the growth rate of a plant

• Determining the water content in a plant

• Assessing the light absorption of a leaf

What might happen to a plant if its roots grew away from the pull of Earth's gravity?

• The plant may not be able to absorb enough water and nutrients

• The plant will grow faster

• The plant will produce more flowers

• The plant will become more resistant to diseases

Why is it important for plants to regulate the level of water in their bodies?

• To prevent dehydration and maintain cellular functions

• To increase photosynthesis rate

• To attract pollinators

• To enhance seed dispersal

How might the onyanga's leaves and root system help it survive in the desert?

• By capturing moisture from fog and storing water

• By growing deep roots to access underground water

• By having a thick bark to reduce water loss

• By producing large flowers to attract insects

Why do you think it is important for plants to be able to

regulate the level of water in their bodies?

• Plants only need water for photosynthesis, so regulating water levels is not particularly important.

  
  

• so that they will not wilt if the conditions are dry or burst or drown if the conditions are too wet.

• because plants can survive in any condition without managing their internal water content.

• it allows plants to control their temperature but does not impact their overall health.

  
  

How do you think the cells that make up the dermal tissues of the

tulip stem might change when the plant’s environment doesn’t have

enough water?

• The dermal cells will absorb more water from the environment.
• The dermal cells will become softer and more flexible.
• The dermal cells will increase in number to enhance water uptake. The plant will grow dry and brittle and start to droop.

• If there isn’t enough water drawn up through the plant by the xylem in the stem, the other cells/tissues in the stem cannot fill with water and won’t be rigid. The tulip will droop/wilt because it does not have enough water in its tissues.

A change in the direction of plant growth in response to gravity is called

• phototropism
• gravitropism
• hydrotropism
• thigmotropism