Write the Word Equation for Photosynthesis. (3 ?marks)
CO2+112O+ ?Light Energy ? ?Glow ose toxygen.
Write the Word Equation for Cellular Respiration. (3 ?marks)
?Glucose + ?Orygen ?CO2+H2O+ ?Energy
Explain how these two processes (question 9 ?and 10) ?rely on each other. (2)
The Correct Answer and Explanation is :
Word Equation for Photosynthesis:
Carbon dioxide + Water + Light energy → Glucose + Oxygen
Word Equation for Cellular Respiration:
Glucose + Oxygen → Carbon dioxide + Water + Energy
Explanation of How Photosynthesis and Cellular Respiration Rely on Each Other:
Photosynthesis and cellular respiration are interconnected processes that sustain life by facilitating energy transfer through ecosystems. These two processes form a crucial biological cycle that ultimately supports all living organisms by providing energy.
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy stored in glucose (a type of sugar). During photosynthesis, carbon dioxide (CO₂) from the atmosphere and water (H₂O) from the environment are absorbed by the plant. Using the energy from sunlight, plants combine these molecules to form glucose (C₆H₁₂O₆) and release oxygen (O₂) as a byproduct. This glucose serves as a primary source of chemical energy for the plant itself and, indirectly, for other organisms that consume plants.
On the other hand, cellular respiration occurs in the cells of organisms (including plants, animals, and fungi) to release the stored energy in glucose. During cellular respiration, glucose is broken down into carbon dioxide (CO₂) and water (H₂O) in the presence of oxygen (O₂), producing energy in the form of adenosine triphosphate (ATP). ATP is the energy currency used by cells for various metabolic activities. In animals, this energy is essential for movement, growth, and bodily functions. Plants also perform cellular respiration to meet their energy needs, even though they also generate glucose via photosynthesis.
The two processes rely on each other because the products of one are the reactants for the other. The oxygen released during photosynthesis is used in cellular respiration, while the carbon dioxide produced in cellular respiration is used in photosynthesis. This cycle forms a continuous loop of energy and matter exchange, maintaining the balance of gases in the atmosphere and providing energy to sustain life. Thus, photosynthesis and cellular respiration are essential complementary processes for the energy flow in ecosystems.