Mass and Structures of Plants

What process do plant cells use to grow and convert carbon dioxide and water into sugar and oxygen gas?

• Exothermic

• Cellular Respiration

• Photosynthesis

• Hypothermia

Answer explanation

the prefix "photo" means light.

Photosynthesis needs light.

A camera needs light to make a photograph.

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

Match the following

• Roots

• 
• Bark

• 
• Stems

• 
• Leaves

• 
• Seeds

• 

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Reorder the following from left to right: the beginning of a tree's pruning wound, the middle, and the end after it repairs itself.

• 
• 
• 

Plants really need:

• H₂O and CO₂

• iron oxide and rust

• rocks

• love

Answer explanation

Water and carbon dioxide are essential molecules for the growth of plants because they are the main reactants for photosynthesis.

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NGSS.MS-LS1-6

NGSS.MS-LS2-1

H₂O and CO₂ are molecules, which means that they:

• have the exact same properties

• cannot be involved in a chemical reaction

• are elements on the periodic table of elements

• can be broken down and that they are made of atoms

Answer explanation

Remember that molecules can be broken during a chemical reaction and that atoms can be rearranged to form new molecules!

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NGSS.MS-PS1-1

Plant structures like roots and leaves have mass, which means that at the most basic level they are made of small particles called _____

Answer explanation

If you said molecules, remember that they aren't the most basic form of matter.

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NGSS.MS-PS1-1

From left to right, choose the order of events that is most likely to be how plants gain mass:

• Substances like H₂O and CO₂ are taken in by the plant for photosynthesis

• H₂O and CO₂ are broken down during chemical reactions inside of plant cells

• Hydrogen, Oxygen, and Carbon atoms are rearranged to form new molecules

• Molecules that can be used to construct plant structures are used to increase the plant's size or grow new structures

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What are some of the molecules that are used by plants to construct new cells and thus new or larger plant structures?

• hydrogen, oxygen, carbon

• carbohydrates, proteins, fats

• iron oxide, sodium acetate, hexamethylenediamine

• acetic acid, sodium bicarbonate

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NGSS.MS-LS1-5

NGSS.MS-LS1-6

NGSS.MS-LS1-7

What are some of the main elements that plants use to grow and repair themselves?

• silver, mercury, iron

• helium, argon, radon

• hydrogen, carbon, oxygen

• hydrogen, uranium, bismuth

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NGSS.MS-LS1-6

Plant mass generally (increases OR decreases?) over time when they grow.

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NGSS.MS-LS1-6

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