Science Grade 7 Unit 6 Test 2017-2018

1 In the diagram above, where is light energy converted to chemical energy? Sun Grass Grasshopper Hawk GO ON

2 What happens to the solar energy absorbed by plants during photosynthesis? It is recycled by the plant and returned to the atmosphere. It is converted into oxygen and glucose. It is stored as heat within the plant for cellular functions. J. It is transformed into chemical energy.

Decaying causes the food to become cold. 3 Fruit and vegetable scraps can be put into compost bins. Water is also needed for composting to be effective. With frequent turning, the compost will turn into soil after about three months. Refer to the information and diagram above. What is occurring in the compost bin? Decaying causes the food to become cold. The amount of matter is doubled. Decomposers break down the organic matter. All the microbes in the food die. GO ON

4 A student researching a northern forest ecosystem learns the following information about feeding relationships in the ecosystem. Which food web best represents the flow of energy in these feeding relationships? F G H J GO ON

5. Analyze the food web above 5 Analyze the food web above. Which animal receives the most energy originally produced by the plants in the food web? Rabbit Frog Owl Snake GO ON

6 Different organisms have specific roles in cycling matter within an ecosystem. Which type of organism has the role of recycling nutrients within the system? Producer Decomposer Predator J Consumer

A As you go higher in the pyramid, the amount of energy increases. Which of the following statements best describes the flow of energy in the pyramid above? A As you go higher in the pyramid, the amount of energy increases. B There is less energy in a producer level than a consumer level. C There is no energy above the level of producers in the system. D Each group receives only a small amount of the energy from the level below it. GO ON

Phytoplankton consists mainly of single-celled algae Phytoplankton consists mainly of single-celled algae. They live in aquatic ecosystems and conduct photosynthesis. Which is the role of phytoplankton in an ecosystem? consumer decomposer parasite J producer GO ON

9 Animals are consumers, meaning they need to eat food for energy because they cannot make their own. Which energy transformation is taking place when an animal eats food so it can keep warm? A Mechanical to thermal B Mechanical to radiant C Chemical to thermal D Radiant to chemical

When energy is passing through a food web, some of the energy is lost as heat. How much of the energy is passed from one level to the next? F 1% G 10% H 50% J 90%

Thermal energy transformed into chemical energy A group of students are investigating the transformation of energy during digestion. The initial temperature of hydrogen peroxide in a beaker is measured and recorded. Small pieces of liver are placed into a beaker of hydrogen peroxide and the temperature is measured and recorded every 30 seconds over a two minute time period. The final temperature was higher than the initial temperature. What energy transformation is under investigation in the scenario above? Thermal energy transformed into chemical energy Chemical energy transformed into thermal energy Chemical energy transformed into mechanical energy Mechanical energy transformed into thermal energy GO ON

organ, tissue, organism, organ system organ system, organ, tissue, 12 Which of the following represents the correct order for the levels of organization of plants and animals? cell, J. cell, organ, tissue, organism, organ system organ system, organ, tissue, organism organ system tissue, organism, tissue, organ, organ system, GO ON

13. There are many processes and systems at work in the human stomach 13 There are many processes and systems at work in the human stomach. The stomach is a part of which larger system? A respiratory B circulatory C digestive D nervous

14 Why is it necessary to have in this equation? Sunlight uses carbon dioxide and water to form sugar. The arrow represents the specific direction of sunlight. H The process cannot occur without energy from the Sun. J The arrow tells the equation to yield.

15 Which of the following organisms can undergo photosynthesis? I. Animals II. Plants III. Fungi I and II I and III C II and III D II only Page 12 BE SURE YOU HAVE RECORDED ALL OF YOUR ANSWERS ON YOUR ANSWER DOCUMENT STOP