Biology Photosynthesis and Cellular Respiration

Which organelle is primarily responsible for photosynthesis in plant cells?

• Mitochondria

• Chloroplast

• Nucleus

• Ribosome

Answer explanation

The chloroplast is the organelle in plant cells that conducts photosynthesis, converting light energy into chemical energy. Mitochondria are involved in respiration, the nucleus contains genetic material, and ribosomes synthesize proteins.

Tags

NGSS.HS-LS2-5

NGSS.HS-LS1-5

What is the main gas taken in by plants during photosynthesis?

• Oxygen

• Carbon dioxide

• Nitrogen

• Hydrogen

Answer explanation

During photosynthesis, plants take in carbon dioxide from the atmosphere. This gas is essential for the process, as it is converted into glucose and oxygen, making carbon dioxide the main gas utilized by plants.

Tags

NGSS.MS-LS1-6

Which molecule is the primary energy carrier produced during cellular respiration?

• Glucose

• ATP

• NADPH

• Starch

Answer explanation

ATP (adenosine triphosphate) is the primary energy carrier produced during cellular respiration, providing energy for various cellular processes. Glucose is a fuel source, while NADPH and starch serve different roles.

Tags

NGSS.HS-LS1-7

What is the chemical formula for glucose?

Answer explanation

The chemical formula for glucose is C₆H₁₂O₆, which indicates it contains 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms. The other options represent different compounds: CO₂ is carbon dioxide, H₂O is water, and O₂ is oxygen.

Tags

NGSS.MS-PS1-1

Which process occurs in the mitochondria of eukaryotic cells?

• Photosynthesis

• Cellular respiration

• Protein synthesis

• DNA replication

Answer explanation

Cellular respiration occurs in the mitochondria of eukaryotic cells, where glucose is broken down to produce ATP, the energy currency of the cell. This process is essential for cellular energy production.

Tags

NGSS.HS-LS1-7

Which of the following best describes the relationship between photosynthesis and cellular respiration?

• They are unrelated processes.

• Photosynthesis stores energy, cellular respiration releases it.

• Both processes release energy.

• Both processes store energy.

Answer explanation

Photosynthesis converts light energy into chemical energy, storing it in glucose. Cellular respiration breaks down glucose to release that stored energy for cellular activities, highlighting their interdependent roles.

Tags

NGSS.HS-LS2-5

Answer explanation

In the photosynthesis equation, the products are on the right side of the arrow. Here, glucose (C6H12O6) and oxygen (O2) are produced. Therefore, O2 is the correct answer as it is a product of photosynthesis.

Tags

NGSS.HS-LS2-5

NGSS.HS-LS1-5

If a plant is placed in the dark, which process will decrease first?

• Cellular respiration

• Photosynthesis

• Protein synthesis

• Mitosis

Answer explanation

In the dark, photosynthesis cannot occur because it requires light. Therefore, the rate of photosynthesis will decrease first, while cellular respiration, which does not depend on light, will continue.

Tags

NGSS.HS-LS1-5

Which of the following best explains why animals depend on plants for survival?

• Plants provide shelter.

• Plants produce oxygen and food through photosynthesis.

• Plants absorb sunlight.

• Plants use cellular respiration.

Answer explanation

Animals depend on plants because they produce oxygen and food through photosynthesis, which are essential for animal survival. This process is vital for maintaining life on Earth.

Tags

NGSS.HS-LS2-5

NGSS.HS-LS1-5

A student sets up an experiment to measure the rate of photosynthesis in a water plant by counting oxygen bubbles produced under different light intensities. What is the independent variable in this experiment?

• Number of oxygen bubbles

• Light intensity

• Type of plant

• Amount of water

Answer explanation

The independent variable is the factor that is changed in an experiment. In this case, light intensity is manipulated to observe its effect on the rate of photosynthesis, indicated by the number of oxygen bubbles produced.

Tags

NGSS.HS-LS1-5