What is the niche of the goose in the marsh?

Chapter 4

1. 
   What is the niche of the goose in the marsh?
   

Answer: The geese feed on the marsh plants. When they feed on these plants, the geese make room for new plants to grow. The geese also release wastes into the soil. This enriches the soil and helps the new plants grow.

2. 
   What does the size of a population depend on? (name at least 2 causes out of 3 present in the book).
   

Answer:
1)
2)
3)

3. 
   Rasm
   
4. 
   Why are Panda populations in danger? Explain as thorough as possible
   

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5. 
   What do ecologists study?
   

Answer:
Bonus:

Describe the interaction of the fish and plants. Tell apart the living and the nonliving of the ecosystem.

Answer:
Both the fish and the plants need water to survive. The plants give off oxygen, which goes into the water. The fish, which need oxygen to live, take the oxygen from the water. As they breathe, the fish give off carbon dioxide. Plants use carbon dioxide to make food. Without the fish, the plants would die. And without the plants, the fish would die.

Chapter 5

1. 
   Why is an atom called “almost all empty space”?
   

Answer:

2. 
   How can you group the elements?
   

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3. 
   Tell compounds, atoms and molecules apart from each other. You may use the diagram below to explain.
   

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4. 
   Unscramble each group of letters to find a science term. rulfoam, cetonler, notrop, tunerro, myblos
   

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5. 
   What is a nucleus? What two kinds of particles does it contain?
   

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Bonus:
The Science book says: “Scientists use indirect evidence to learn about distant or very small objects.”
Elaborate* on the idea. Give examples of what ways scientists might use indirect evidence.


Answer:

Chapter 6

1. 
   Explain how physical and chemical changes are different.
   

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2. 
   Explain how a solution and suspension are different.
   

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3. 
   Fill in the gaps using the words you learned in the chapter.
   

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4. 
   Imagine you are blindfolded and asked to differentiate
   

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5. 
   Tell about three states of matter. Tell them apart from each other (include information on attraction, volume)
   

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Bonus:
How can we understand that something is a mixture, not a compound?
Prove that by mixing water and salt/sugar we have a mixture, not a compound.


Answer:


Chapter 7

1. 
   An atom has 5 electrons and 4 protons. What can you say about its charge? Explain. Answer in full sentences.
   

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2. 
   Define conductors and insulators. Give 3 examples for each.
   

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3. 
   Fill in the gaps using the words you learned in the chapter
   

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4. 
   What did Benjamin Franklin do to prove that lightning is a form of electricity?
   

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5. 
   Why do people use parallel circuits in homes, but not series circuits?
   

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Bonus:
Tell electric discharge and current electricity apart. The definitions only are 0.2 points.


Answer:

Chapter 8

1. 
   Would you believe if I told you that we are using dinosaurs to fuel our generators and cars? Why yes/no?
   

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2. 
   Tell the difference between fusion and fission. Which one is preferable in today’s world? Why?
   

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3. 
   What does this picture tell you? Explain in full sentences.
   

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4. 
   Explain the greenhouse effect. Why do you think it is called so?
   

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5. 
   Write as many energy sources as possible.
   

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Bonus:
Explain how any power plant works. Make drawings if you find it easier to explain this way.


Answer: