Question

Philippe wants to measure how much water his potted tomato plants lose through transpiration each day. To do this, he sets up a series of experiments to capture the water that leaves the plants. Which of these experiment designs would BEST measure the amount of water lost through transpiration? Text to speech
A.Enclosing the plant’s roots in plastic to collect the water transpired by the plant.
B.Enclosing the plant in plastic so that any water lost through transpiration could be collected.
C.Placing the tomato plant inside a dark corner where the rate of transpiration would be slow and easy to measure.
D.Placing the tomato plant outside in the full sun to maximize the rate of transpiration and make measuring transpiration easy.

Krista has been watching a heavy rainfall outside. After the storm, she walks out and notices that there is no water in the gravel driveway, some water in the grassy yard, and a standing puddle in the hard-packed dirt in the corner of the yard. What statement BEST explains Krista’s observations? Text to speech

A.The infiltration rate of the gravel is faster than that of the grassy area, which is faster than the hard-packed dirt.

B.The infiltration rate of the gravel is slower than that of the grassy area, which is slower than the hard-packed dirt.

C.Less precipitation fell on the gravel driveway than on the grassy area, which had less precipitation than the hard-packed dirt area.

D.More precipitation fell on the gravel driveway than on the grassy area, which had more precipitation than the hard-packed dirt area.

Transitions from condensed water to crystallized water and back again occur often in nature. Such transitions are particularly frequent in winter. Below are parts of a model that help illustrate this idea. Which statement makes the best caption to explain the role of energy in this model?

A.Energy is released during both transitions.

B.Energy is absorbed during both transitions.

C.Water loses energy during crystallization and gains energy during melting.

D.Water gains energy during crystallization and loses energy during melting.

Answer 1

1. The correct answer is B.

Blatantly increasing or decreasing the rate of transpiration is not an accurate way to measure the typical amount of water that is lost through transpiration, which eliminates choices C and D. The method proposed in choice B is pretty wrong and will lead to the collection of no water.

For the second question, the correct answer is A. The prompt mentioned that the dirt area contained the most water, which automatically eliminates choices B and D. What makes choice C wrong is that the water reached the materials in equal amounts, but some of them were able to infiltrate the water faster. Hard-packed dirt will, due to its thickness, always take the longest to infiltrate water.

For the third question, we know that energy is required to melt things -- thus eliminating choices B and D. Because the energy is being used, it would have to lose some energy and not gain any back unless you're melting something. The difference between choices A and C is that HEAT is released during crystallization...only! In order for something to melt, heat/energy must be taken in. So, the correct answer is C.