Most of the dry weight of a plant is made up of ca

Most of the dry weight of a plant is made up of carbon, oxygen, and hydrogen. The next most abundant element in a plant is likely to be ________.

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Biology Unit VIIII Assessment: Answer the questions


Question 1


Most of the dry weight of a plant is made up of carbon, oxygen, and hydrogen. The next most abundant element in a plant is likely to be ________.














5 points  

Question 2


Before deciduous trees go through abscission, they ________.




move nutrients stored in their roots up into their leaves



secrete pigments that cause their leaves to change color



open their stomata to eliminate excess water



stop making chlorophyll

5 points  

Question 3


Cutting and burning forests in the tropics releases around ______ of the carbon dioxide added to the atmosphere each year.




only one percent or less



50% or more



more than 1% but less than 10%




5 points  

Question 4


The increase in greenhouse gases in the atmosphere is most similar to which of the following phenomena?




Putting an extra blanket or two over yourself when you go to bed



Aiming a fan to blow warm air from one part of the room to another



Opening the vent in a greenhouse for increased ventilation on a hot day



Creating a fire by rubbing one stick against another

5 points  

Question 5


Why does a houseplant growing on a windowsill tend to grow towards the window?




This growth allows the plant to obtain moisture from the air outside.



This growth gives leaves maximum exposure for photosynthesis.



This growth allows the plant to obtain heat from the sun.



This growth gives leaves maximum exposure for respiration.

5 points  

Question 6


The use of chemical pesticides may be reduced by ________.




a one-time, very strong treatment of pesticides



a reduction in the use of irrigation



the long-term utilization of integrated pest management



mulching and tilling the soil

5 points  

Question 7


Which of the following food items is actually a unique set of modified leaves?







Sweet potato



Oat grain



White potato

5 points  

Question 8


Which type of plant would be expected to suffer the most and the earliest during a drought?














5 points  

Question 9


The United States represents less than five percent of the world`s population. However, it is responsible for ______ of the world`s carbon dioxide emissions resulting from burning fossil fuels.







Less than one percent






Over 50%

5 points  

Question 10


Which of the following is considered a Monocot?






















Plant Transpiration

Unit VIII Assessment




If you have not already, you or someone you know will try to grow a variety of plants either inside your house or outside in a garden. What type of soil do you need? How often should you water the plants? Should you plant them in full sun? Why do some plants need less water and some more? These are questions that many people have about plants. In this activity, you will have a chance to manipulate different variables to see how much water some plants use and how much some lose through transpiration.




  1. Conduct virtual experiments to determine factors that affect transpiration.
  2. Compare and contrast sustainable and unsustainable farming practices.



Computer with internet access




  1. Go to:
  2. Read the Purpose and Objectives.
  3. Read and follow the information under Procedures and complete the lab for all 4 plants and all 3 variables.
  4. Reset the lab and complete the lab for the next set of 4 plants and 3 variables.
  5. Record your information in the Results Table provided on this sheet.
  6. During and after the lab, answer the questions below.
  1. Type all answers directly on the data sheet.
  2. Select Save As, and use your last name and student ID as a file name. 
  3. Upload the data sheet as a .doc, .docx, or .rtf file when finished.


Questions 1 – 10 are short answer questions and should be answered in 2 to 3 words or 1 to 2 complete sentences. Each question is worth 2 points for a total of 20 points.


  1. What are the three different variables that you tested?



  1. State your question.



  1. State your hypothesis.







  1. Describe the process of transpiration.



5.   What environmental factors that you tested increased the rate of transpiration? Was the rate of transpiration increased for all plants tested?


  1. Did any of the environmental factors (heat, light, or wind) increase the transpiration rate more than the others? Why?


  1. Which species of plants that you tested had the highest transpiration rates? Why do you think different species of plants transpire at different rates?


  1. What is your conclusion?



  1. Did your results support your hypothesis?



10.  State another question about transpiration that you would like to have answered that you did not answer in this lab.


Gardening TechniquesName of StudentInstitutional Affiliation NitrogenStop making chlorophyll25%Putting an extra blanket or two over yourself when you go to bedThis growth gives leaves maximum exposure for photosynthesisThe long term utilization of integrated pest managementOnionDandelionCorn10%Plant Transpiration Amount of water transpired after 1 hour (ml)PlantNormalFanHeaterLampDevils Ivy2.9ml4.6ml4.1ml3.0mlRubber Plant4.9ml8.4ml6.8ml4.3mlArrowhead3.6ml7.5ml6.6ml4.0mlWeeping fig3.3ml6.1ml4.9ml2.5mlGeranium1.2ml4.7ml5.8ml2.4mlDieffenbachia4.1ml7.7ml6.0ml3.9mlZebra Plant4.2ml7.6ml6.1ml3.2mlEnglish Ivy1.8ml5.1ml3.2ml2.1mlQuestion 1WindHeatLightQuestion 2What are the factors that affec...
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