MP3 Benchmark BTW 7th Science

Take your time you got this!!

Over time, the number of white rabbits increases while the number of brown rabbits decreases. What is the most likely reason for this change?

The white rabbits were able to blend in better with the snow, avoiding predators.

Which of the following is NOT used as evidence to support the theory of evolution?

Individual organisms changing their traits during their lifetime.

A population of birds lives on an island where the main food source is hard-shelled nuts. Over many generations, most of the birds develop stronger, larger beaks. What is the best explanation for this change?

Birds with larger beaks survived and passed on their traits more often than birds with smaller beaks.

A heterozygous black rabbit (Bb) is crossed with a white rabbit (bb). What percentage of the offspring are expected to have black fur?

50%

Bald eagles eat a variety of organisms including snakes. How did the increase in the population of bald eagles MOST likely affect snakes living in eagle habitats?

The increase reduced the number of snakes.

A flower growing in a pot is placed at the center of a table. Which of these nearby objects will the flower grow toward?

A sunny window

An ecosystem is a community of organisms interacting with their physical environment. Why are decomposers an important part of ecosystems?

They break down dead organisms to return nutrients to the soil.

What can MOST likely be said about the amount of energy available for third-order consumers?

The amount of available energy decreases for third-order consumers.

Which is NOT a process involved in the water cycle?

fixation

The nitrogen cycle is important to plants because?

plants cannot use nitrogen as it is.

How is burning gasoline in an automobile engine part of the carbon cycle?

Burning gasoline produces carbon dioxide as a gas in the atmosphere.

Photosynthesis and respiration are both parts of which cycle?

carbon cycle

Which statement BEST explains why photosynthesis is the foundation of most food webs?

Sunlight is the source of energy for nearly all ecosystems.

Animals depend on plants for many things, including food. What do plants depend on from animals?

carbon dioxide

Which structure refers to a group of specialized cells that all perform the same function?

tissue

An excerpt from a student’s science notebook is shown. Which labeled part of the notes contains incorrect information?

2

Which is one function that makes a plant cell different from an animal cell?

ability to convert sunlight into energy

How are plant cells different from animal cells?

Only plant cells can perform photosynthesis.

Which organelle stores DNA and acts as a control center for the cell?

Nucleus

A characteristic that all living organisms have in common is they

are made of cells.

What best describes how a farm lands threaten the local ecosystem and species survival?

Fertilizing the crops on farmlands can lead to eutrophication.

What reactants are needed for cellular respiration to occur?

Oxygen and Glucose

Plants store glucose produced by photosynthesis, while animals consume other organisms to obtain energy. Which of the following BEST explains how organisms use energy stored from the products of photosynthesis?

The glucose produced in photosynthesis is broken down in cellular respiration to release energy in the form of ATP.

Directions: Choose 2 answers. Which of the following are examples of passive transport.

Osmosis and Diffusion

In which situation would osmosis likely occur?

across a membrane that has a higher concentration outside of the cell