Photosynthesis Basics

Why can't heterotrophic consumers make their own glucose?

• They can produce glucose through photosynthesis.

• They lack the necessary enzymes to synthesize glucose.

• They must consume plants or organisms that ate plants to obtain glucose for energy.

• They are unable to absorb glucose from their environment.

What happens to starch when energy is needed by the plant?

• Starch is stored for later use.

• Starch is broken down to form glucose for routine growth, repair, and production of flowers, fruits, or seeds.

• Starch is converted into proteins for growth.

• Starch is transformed into fats for energy storage.

What happens during the light-independent reaction (Calvin cycle)?

• CO₂ from the air enters through the stomata, and using hydrogen from NADPH and energy from ATP, the plant builds glucose (C₆H₁₂O₆).

• Oxygen is released as a byproduct while glucose is broken down into carbon dioxide and water.

• Light energy is absorbed by chlorophyll and converted into chemical energy in the form of glucose.

• NADPH and ATP are produced, which are then used in the light-dependent reactions.

What role does NADPH play in photosynthesis?

• NADPH carries hydrogen ions to the second phase of photosynthesis.

• NADPH is a byproduct of the light-dependent reactions.

• NADPH is used to absorb sunlight during photosynthesis.

• NADPH helps in the formation of glucose from carbon dioxide.

What is the primary pigment involved in photosynthesis?

• Chlorophyll

• Carotene

• Xanthophyll

• Melanin

How does carbon dioxide enter plant leaves?

• Through small openings called stomata.

• Through the roots of the plant.

• Through the flowers of the plant.

• Through the bark of the tree.

What happens to H₂O in the chloroplast of a plant cell?

• H₂O is converted into glucose and oxygen.

• H₂O is split into H+ (hydrogen ion) and O₂, with O₂ released through the leaf’s stomata as a byproduct.

• H₂O is stored in the vacuole for later use.

• H₂O is transformed into carbon dioxide during photosynthesis.

How do plants store excess glucose?

• As cellulose in cell walls

• As starch in leaves, roots, stems, seeds, and fruits

• As sugar in the air

• As protein in the soil

Why are plants called autotrophs?

• They rely on other organisms for food.

• They make their own food as glucose, serving as producers in the ecosystem.

• They can only survive in water.

• They are unable to perform photosynthesis.

What is the role of ATP in photosynthesis?

• ATP is used to absorb sunlight.

• ATP provides the energy needed for the light-independent reaction (Calvin cycle or dark reaction).

• ATP is a byproduct of the light-dependent reactions.

• ATP helps in the formation of glucose during photosynthesis.