Life Science Assessment - Science Tutorials

Which statement best explains why only about 10% of the energy in Level 1 is available to organisms in Level 2?

• The energy in Level 1 is stored energy.

• The organisms in Level 1 consume most of the energy.

• Energy is lost as it moves through the energy pyramid.

• The organisms in Level 1 convert much of their energy to other forms.

Answer explanation

The correct choice explains that organisms in Level 1 convert much of their energy to other forms, such as heat and movement, which results in only about 10% of the energy being available to organisms in Level 2.

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NGSS.MS-LS2-3

NGSS.MS-LS1-6

The carbon cycle is a crucial process in our ecosystem. It involves the movement of carbon atoms between the atmosphere, living organisms, and the Earth. In photosynthesis, plants use carbon dioxide (CO₂) and sunlight to produce oxygen (O₂) and glucose. This glucose is then used by plants and other organisms in cellular respiration to produce energy. How does the carbon cycle illustrate the Law of Conservation of Mass?

• It shows that energy can be created and destroyed.

• It demonstrates that the amount of carbon remains constant through different stages.

• It depicts that oxygen is a product only of photosynthesis.

• It proves that carbon atoms can be converted into other elements.

Answer explanation

The carbon cycle illustrates the Law of Conservation of Mass by demonstrating that the amount of carbon remains constant through different stages, as carbon is recycled in various forms without being created or destroyed.

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NGSS.MS-LS2-3

NGSS.MS-LS1-6

What do scientists call the parts of a cell?

• Pieces

• Sections

• Organelles

• None of the above

Answer explanation

Scientists refer to the parts of a cell as organelles. These specialized structures perform various functions essential for the cell's life, making 'organelles' the correct term, unlike 'pieces' or 'sections'.

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NGSS.MS-LS1-2

Which of these is a unicellular organism?

• Fish

• Worm

• Amoeba

• Ant

Answer explanation

The correct answer is Amoeba, as it is a unicellular organism. Fish, worms, and ants are multicellular organisms, consisting of many cells.

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NGSS.MS-LS1-1

The DNA of a cell is found in the __________.

• mitochondria

• lysosome

• nucleus

• vacuole

Answer explanation

The DNA of a cell is primarily located in the nucleus, which houses the genetic material. Other organelles like mitochondria and lysosomes do not contain the cell's DNA.

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NGSS.MS-LS1-1

NGSS.MS-LS1-2

Eukaryotes (cells with a true nucleus) have several different types of ____________________  that Prokaryotes don't have.

• membrane bound organelles

• organs

• membranes

• friends

Answer explanation

Eukaryotes possess membrane-bound organelles, such as the nucleus, mitochondria, and endoplasmic reticulum, which are absent in prokaryotes. This distinction is crucial for cellular function and complexity.

Plant cells do not contain this organelle:

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NGSS.MS-LS1-1

NGSS.MS-LS1-2

Which two organelles found in plant cells that are not found in animal cells:

• Cell Membrane

• Cell Wall

• Nucleus

• Chloroplasts

• Mitochondria

Answer explanation

Chloroplasts and cell walls are unique to plant cells. Chloroplasts enable photosynthesis, while the cell wall provides structure and protection, distinguishing them from animal cells, which lack these organelles.

An ecological population can be defined as

• A living thing such as a plant or animal.

• A system comprising all the biotic and abiotic factors in an area and all the interactions among them

• All of the populations of different species in a particular area. All the populations in an ecosystem.

• A group of interacting organisms of the same species. A group of interbreeding organisms (species) living in the same area

Answer explanation

An ecological population specifically refers to a group of interacting organisms of the same species that live in the same area, which is why this choice is correct. Other options describe broader ecological concepts.

An ecosystem can be defined as

• A living thing such as a plant or animal.

• A system comprising all the biotic and abiotic factors in an area and all the interactions among them

• All of the populations of different species in a particular area. All the populations in an ecosystem.

• A group of interacting organisms of the same species. A group of interbreeding organisms (species) living in the same area

Answer explanation

An ecosystem includes all living (biotic) and non-living (abiotic) components in an area, along with their interactions. This definition captures the complexity of ecosystems better than the other options.