Middle School Life Science Flashcards: Matter Enters Through Photosynthesis

What this deck covers

This deck focuses on Matter Enters Through Photosynthesis, giving you a quick way to review the definitions, rules, and examples that matter most for Middle School Life Science.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: What raw material provides the hydrogen atoms that enter organisms during photosynthesis?

Answer: Water ($H_2O$). Water molecules are split to provide hydrogen for sugar synthesis.

Flashcard 2: What is the main sugar molecule that stores matter made by photosynthesis?

Answer: Glucose ($C_6H_{12}O_6$). This 6-carbon sugar is the primary product storing chemical energy.

Flashcard 3: What is the balanced chemical equation for photosynthesis?

Answer: $6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$. Shows how inorganic molecules combine to form organic matter.

Flashcard 4: Which plant cell organelle is the main site where photosynthesis moves matter into sugars?

Answer: Chloroplast. Contains the machinery to convert light energy into chemical bonds.

Flashcard 5: What pigment absorbs light energy used to drive photosynthesis in plants?

Answer: Chlorophyll. This green pigment captures light energy to power the reactions.

Flashcard 6: Which gas is taken in through stomata and becomes part of sugar during photosynthesis?

Answer: Carbon dioxide ($CO_2$). Stomata are pores that allow this gas to enter leaf cells.

Flashcard 7: Which gas is released as a product when water is split during photosynthesis?

Answer: Oxygen ($O_2$). Released when water molecules are split for their hydrogen atoms.

Flashcard 8: Identify the form of matter that plants make and store when they convert $CO_2$ into food.

Answer: Organic molecules (sugars such as glucose). Inorganic carbon is converted into organic carbon compounds.

Flashcard 9: What structure controls gas exchange so $CO_2$ can enter a leaf for photosynthesis?

Answer: Stomata. These pores open and close to regulate gas exchange in leaves.

Flashcard 10: What plant tissue transports water to leaves so its atoms can enter sugars in photosynthesis?

Answer: Xylem. Transports water from roots upward through the plant stem.

Flashcard 11: What plant tissue transports sugars made in leaves to the rest of the plant?

Answer: Phloem. Moves sugars from source (leaves) to sink (roots, fruits).

Flashcard 12: What raw material provides the carbon atoms that enter organisms during photosynthesis?

Answer: Carbon dioxide ($CO_2$). Carbon atoms from $CO_2$ become the backbone of organic molecules.

Flashcard 13: Which statement best describes matter movement in photosynthesis: matter is created or rearranged?

Answer: Matter is rearranged into new molecules. Follows conservation of matter - atoms are reorganized, not created.

Flashcard 14: Choose the correct source of a plant’s increased mass: soil minerals, sunlight, or $CO_2$.

Answer: $CO_2$ (carbon atoms become part of plant biomass). Most plant mass comes from air, not soil or light energy.

Flashcard 15: Identify the reactants in photosynthesis: $CO_2$, $H_2O$, glucose, or $O_2$.

Answer: $CO_2$ and $H_2O$. These are the starting materials that enter the reaction.

Flashcard 16: Identify the products in photosynthesis: $CO_2$, $H_2O$, glucose, or $O_2$.

Answer: Glucose ($C_6H_{12}O_6$) and $O_2$. These are the substances formed by the photosynthesis reaction.

Flashcard 17: If a plant is given extra $CO_2$, which product molecule contains the added carbon atoms?

Answer: Glucose ($C_6H_{12}O_6$). Carbon from $CO_2$ is incorporated into the sugar's structure.

Flashcard 18: Which trophic level first gains new organic matter from photosynthesis: producers or consumers?

Answer: Producers (autotrophs). Only producers can convert inorganic matter into organic matter.

Flashcard 19: What are the products in the photosynthesis equation that contain the new organic matter?

Answer: Glucose (sugar) and $O_2$. These organic products store chemical energy and form plant biomass.

Flashcard 20: Which substance supplies most of the carbon atoms that end up in plant sugars and biomass?

Answer: $CO_2$ from the air. Plants absorb carbon dioxide through stomata to build organic molecules.

Flashcard 21: Which pigment captures light energy that powers photosynthesis?

Answer: Chlorophyll. This green pigment absorbs light energy to drive chemical reactions.

Flashcard 22: Which plant structure is the main entry point for $CO_2$ to move into a leaf?

Answer: Stomata. These pores in leaves open and close to regulate gas exchange.

Flashcard 23: What is the main form of stored plant matter made from many glucose units?

Answer: Starch. Plants link glucose molecules together for long-term energy storage.

Flashcard 24: What happens to the oxygen atoms in $CO_2$ and $H_2O$ during photosynthesis?

Answer: Many end up in $O_2$ released and in sugar and water molecules. Oxygen atoms are redistributed among products through chemical bonds.

Flashcard 25: Which option best describes what happens to $CO_2$ during photosynthesis: released, absorbed, or destroyed?

Answer: Absorbed and used to build sugars. Plants take in $CO_2$ and incorporate its carbon into glucose molecules.

Flashcard 26: What is the definition of photosynthesis in terms of moving matter into organisms?

Answer: It converts $CO_2$ and $H_2O$ into sugars (biomass) using light energy. Light provides energy to transform inorganic molecules into organic compounds.

Flashcard 27: What are the reactants in the word equation for photosynthesis?

Answer: $CO_2$ and $H_2O$ (with light as the energy input). These inorganic molecules provide carbon and hydrogen atoms for sugar synthesis.

Flashcard 28: What are the products in the word equation for photosynthesis?

Answer: Glucose (sugar) and $O_2$. Sugar stores chemical energy; oxygen is released as a byproduct.

Flashcard 29: Which atom type is the main element moved from air into plant biomass during photosynthesis?

Answer: Carbon atoms from $CO_2$. Carbon forms the backbone of all organic molecules in living things.

Flashcard 30: Identify the correct claim: Photosynthesis creates matter or rearranges existing atoms into new molecules?

Answer: It rearranges existing atoms into new molecules. Conservation of matter means atoms cannot be created from nothing.