6th_Unit 2 Review Quiz

Which of the following best explains why the tilt of Earth on its axis creates the seasons?

Because the axis of Earth is tilted -

• the amount of time it takes for the light to reach Earth changes a little throughout the year.

• the angle of sunlight varies on different parts of Earth at different times.

• the surface area of Earth is not constant at all parts of its orbit.

• the north pole of Earth will always be pointed away from the Sun, making it colder

Answer explanation

The tilt of Earth causes sunlight to hit different parts at varying angles throughout the year, leading to seasonal changes. This variation in angle affects the intensity and duration of sunlight received, creating the seasons.

Tags

NGSS.MS-ESS1-1

The Southern Hemisphere experiences the coldest seasonal weather during what portion of the Earth’s orbit?

• When the orbital speed of the Earth is the fastest.

• During the time when the Earth passes Jupiter.

• When the South Pole tilts away from the Sun.

• During the time when both hemispheres have a full moon.

Answer explanation

The Southern Hemisphere experiences its coldest weather when the South Pole tilts away from the Sun, leading to less direct sunlight and colder temperatures during that part of Earth's orbit.

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NGSS.MS-ESS1-1

NGSS.MS-ESS2-6

Which of the following statements is not true concerning all living things?

• They are made of cells.

• They reproduce.

• They use energy for growth and maintenance.

• They have cell walls as an outer boundary.

Answer explanation

The statement 'They have cell walls as an outer boundary' is not true for all living things. While plants and fungi have cell walls, animals do not, making this statement incorrect.

In the 1800s two scientists, Theodor Schwann and Matthias Schleiden, studied different types of organisms. After many years of studying a great variety of organisms, they drew similar but independent conclusions about their observations. What statement was developed most directly from these conclusions and is part of the modern cell theory?

• The functions of living things occur in cells.

• Cells exist only in multicellular organisms.

• Living things are composed of cells.

• Cells contain hereditary information.

Answer explanation

Theodor Schwann and Matthias Schleiden concluded that all living things are made up of cells, which directly supports the statement 'Living things are composed of cells.' This is a fundamental part of modern cell theory.

Tags

NGSS.MS-LS1-1

Emma is conducting an experiment and records the number of cells grown in three separate petri dishes over a period of 20 days. A table is provided. The data shown in the table best illustrates which part of the cell theory?

• All living things are made up of cells.

• Cells are the basic unit of living things.

• Organisms can be single celled or many celled.

• All cells come from preexisting cells.

Answer explanation

The data collected by Emma shows cell growth over time, indicating that new cells arise from existing ones, supporting the idea that all cells come from preexisting cells, a key aspect of cell theory.

Tags

NGSS.MS-LS1-1

Several types of organisms are described in the following table. Which organism is a prokaryotic organism?

• Organism 1

• Organism 2

• Organism 3

• Organism 4

Answer explanation

Organism 1 is a prokaryotic organism because it lacks a nucleus and membrane-bound organelles, which are characteristic features of prokaryotes. The other organisms likely possess these features, indicating they are eukaryotic.

Tags

NGSS.MS-LS1-1

Which of the following is an accurate description of the characteristics of prokaryotic cells?

• Contains DNA, ribosomes, and cytoplasm

• Has a membrane bound nucleus and ribosomes

• Has complex cells with membrane bound organelles

• Contains DNA, nucleus, and ribosomes

Answer explanation

Prokaryotic cells are characterized by the absence of a membrane-bound nucleus and organelles. They contain DNA, ribosomes, and cytoplasm, making the first choice the accurate description.

An organism that is only one cell big is called a(n)−

• unicellular organism

• multicellular organism

• cellular organisms

• tricellular organism

Answer explanation

An organism that is only one cell big is called a unicellular organism. This term specifically refers to organisms that consist of a single cell, distinguishing them from multicellular organisms, which are made up of multiple cells.

Tags

NGSS.MS-LS1-1

Students were asked to determine if the two slides are cells taken from plants or cells taken from animals. Which of the students’ explanations is most accurate?

• Student 1: Slides 1 and 2 are both animal cells because they both have a nucleus.

• Student 2: Slides 1 and 2 are both plant cells because they both have cell membranes.

• Student 3: Slide 1 is an animal cell because it does not have a cell wall. Slide 2 is a plant cell because it does have a cell wall.

• Student 4: Slide 1 is a plant cell because it contains a nucleus, Slide 2 is an animal cell because it does not have a nucleus.

Answer explanation

Student 3 accurately identifies Slide 1 as an animal cell due to the absence of a cell wall and Slide 2 as a plant cell because it has a cell wall, which is a key distinguishing feature between plant and animal cells.

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Autotrophs and heterotrophs differ in which of the following ways?

• Autotrophs do not require a source of energy.

• Heterotrophs need to consume other organisms for energy.

• Autotrophs obtain their energy directly from the soil.

• Heterotrophs produce their own food energy.

Answer explanation

Heterotrophs need to consume other organisms for energy, while autotrophs produce their own food using sunlight or inorganic substances. This distinction is key in understanding their roles in ecosystems.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3