Question

Decide whether each of the following statements regarding photosynthesis and respiration is true or false. Energy is required for respiration. Sugar and oxygen O2 are consumed in photosynthesis. Carbon dioxide CO2 and water H2O are consumed in respiration.

Answer 1

Energy is required for respiration, making the first statement true. The second statement is false; photosynthesis consumes carbon dioxide and water, not sugar and oxygen. The third statement is also false; respiration consumes oxygen and glucose, producing carbon dioxide and water.

Step-by-step explanation:

Deciding whether statements regarding photosynthesis and respiration are true or false requires an understanding of the basic principles of both processes. Energy is indeed required for cellular respiration; this is a true statement as cells use this process to produce ATP, the energy currency of the cell, from sugar and oxygen. Moving on to the second statement, it is false that sugar and oxygen O2 are consumed in photosynthesis; it is actually carbon dioxide and water that are consumed. The final statement that carbon dioxide CO2 and water H2O are consumed in respiration is also false; in aerobic respiration, oxygen and glucose are consumed, while CO2 and H2O are produced as waste products.

Answer 2

1. Energy is required for respiration.

Answer: True.

Explanation: Cell respiration is a three-step process in aerobic organisms (Those that need oxygen): Glycolisis, Krebs cycle and oxidative phosphorilation. In glycolisis, glucose and other sugars are oxidize to pyruvic acid and energy (ATP) is needed in two of the reactions (to activate glucose and to activate fructose 6-phosphate).

2. Sugar and oxygen O2 are consumed in photosynthesis.

Answer: False.

Explanation: Photosynthesis is a process carry out by cianobacteria, algae and plants to produce sugar and oxygen from sunlight. This process has two phases:

a) Luminic phase. In this phase the energy from the sunlight is transported throught photosystems as electrons, oxygen and energy sustrates like NADPH are produced.

b) Calvin cycle. In this phase, sugars are synthetize from CO2 fixation and enzimatic activity in several steps, using NADPH produced in previous phase, as energy.

3. Carbon dioxide CO2 and water H2O are consumed in respiration.

Answer: False.

Explanation: In cell respiration, glucose and other sugars are completely oxidize to produce energy as ATP and as a residue, CO2. In this process, oxygen is consumed producing oxygen-reactive species that are neutralized by enzimes to form water (H2O).