LS.8.2.3: Nutrition

Which best explains why organisms need food?

• Food is the source of energy required for growth and repair of tissues

• Food provides the raw materials for producers to produce more food

• Food is the water needed to hydrate the surface of cells

• Food provides the oxygen necessary for plant and animal survival

Answer explanation

Organisms need food as it provides the energy necessary for growth and tissue repair. This is essential for maintaining health and supporting life processes.

Tags

NGSS.MS-LS1-7

How are plant cells and human cells the same?

• They can produce their own oxygen

• They make their own food from sunlight

• They can receive nutrients through the cell wall

• They use mitochondria to release energy from sugars

Answer explanation

Both plant and human cells use mitochondria to release energy from sugars, which is essential for cellular respiration. This process is common to both cell types, highlighting a key similarity in their energy metabolism.

Which best describes how organisms obtain energy from food?

• Food reacts with oxygen to release energy

• Food reacts with sunlight to release energy

• Food reacts with water to release energy

• Food reacts with carbon dioxide to release energy

Answer explanation

Organisms obtain energy from food through a process called cellular respiration, where food reacts with oxygen to release energy. This is essential for growth, repair, and maintaining bodily functions.

Tags

NGSS.MS-LS1-7

Which statement correctly describes the process occurring in the model?

• Food is being broken down by chemical reactions to create different molecules needed in the body.

• Food is being transformed by chemical reactions into heat to create different energy needed in the body.

• Food is being replaced by cellular building blocks to create different molecules needed in the body

• Food is being processed into different molecules by heat to create different energy needed in the body.

Answer explanation

The correct choice states that food is broken down by chemical reactions, which aligns with the process of digestion where complex molecules are converted into simpler ones needed by the body.

Tags

NGSS.MS-LS1-7

Which TWO statements are true about atoms in the process of cellular respiration?

• The atoms from photosynthesis products are rearranged, so some energy is lost.

• The types of atoms change during the chemical reaction, producing more energy.

• The atoms in the products are rearranged from the reactants.

• The number and type of atoms stay the same after the chemical reactions.

• The number of atoms increases as energy is produced after the chemical reaction.

Answer explanation

In cellular respiration, the atoms in the products are indeed rearranged from the reactants, and the number and type of atoms remain constant, adhering to the law of conservation of mass.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which claim can be supported using the equation for cellular respiration?

• The products have less matter than the reactants.

• Matter is created as an organism processes food.

• The reactants have more energy than the products.

• Matter is conserved as it moves through an organism.

Answer explanation

The equation for cellular respiration shows that the total mass of reactants equals the total mass of products, demonstrating that matter is conserved as it moves through an organism.

Where does the matter that the boy uses for growth come from?

• Some of the matter comes from the oxygen he breathes, and his body creates the rest.

• Some of the matter comes from the food he eats, and his body creates the rest.

• All of the matter comes from the food he eats.

• All of the matter comes from the oxygen he breathes.

Answer explanation

The correct answer is that all of the matter comes from the food he eats. Food provides the necessary nutrients and energy for growth, while oxygen is primarily used for respiration, not as a direct source of matter.

Tags

NGSS.MS-LS1-7

How do plants obtain the nutrients necessary for their growth?

• By absorbing them from the soil through their roots

• By producing them through photosynthesis

• By consuming other organisms

• By converting sunlight into nutrients

Answer explanation

Plants obtain nutrients primarily by absorbing them from the soil through their roots. While they produce energy through photosynthesis, they do not create nutrients; they need to take them up from their environment.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

What is the main purpose of cellular respiration in cells?

• To produce glucose

• To release energy from food molecules

• To absorb sunlight

• To create new cells

Answer explanation

The main purpose of cellular respiration is to release energy from food molecules, which cells use to perform various functions. The other options do not accurately describe this essential process.

Which process do plants use to convert sunlight into chemical energy?

• Cellular respiration

• Photosynthesis

• Fermentation

• Digestion

Answer explanation

Plants use photosynthesis to convert sunlight into chemical energy, specifically glucose, by utilizing carbon dioxide and water. This process is essential for their growth and energy needs.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3