SSCE VCE Biology Biochemical Pathways and Energy Transformations: The following diagrams show

Gra

Question

The following diagrams show

Graph one  The rate of photosynthesis in a green plant at different wavelengths of light
Graph two  The estimated absorption of the different wavelengths of light by the different plant pigments.

### a. Explain why the graph showing the rate of photosynthesis has approximately the same shape as the absorption graphs of the plant pigments.

The graph of the rate of photosynthesis is closely related to the absorption spectra of pigments because photosynthesis primarily occurs in the presence of light that is absorbed by these pigments. Chlorophyll a and b absorb light most effectively in the blue and red regions of the spectrum. These are the wavelengths where the rate of photosynthesis is highest, signifying that more light energy is utilized for the conversion to chemical energy. At the wavelengths where absorption is low, such as in the green wavelengths, the rate of photosynthesis also drops, supporting the correlation between light absorption and photosynthetic activity.

### b. The following diagram shows a simplified representation of the first stage of photosynthesis.
#### i. Name one input item that X could represent.

One input item that X could represent is sunlight.

#### ii. One output item that Y could represent.

One output item that Y could represent is ATP (adenosine triphosphate).

### c. What is the energy yield per molecule of glucose as a result of aerobic respiration?

The energy yield per molecule of glucose during aerobic respiration is approximately 36 to 38 ATP molecules.

### d. The breakdown of glucose in aerobic respiration can also be represented occurring in three particular stages as indicated below:
1. Glycolysis
2. Krebs cycle
3. Electron transport

#### i. Within a cell, where does the electron transport stage of aerobic respiration occur?

The electron transport stage of aerobic respiration occurs in the inner mitochondrial membrane.

#### ii. Describe what happens during the electron transport stage. In your answer include the name of product Z.

During the electron transport stage, electrons are transferred through a series of proteins embedded in the inner mitochondrial membrane. This transfer of electrons releases energy, which is used to pump protons (H+) across the membrane, creating a proton gradient. As protons flow back into the matrix through ATP synthase, ATP is produced. The final electron acceptor is oxygen, which combines with the electrons and protons to form water. The product Z is water.

The following diagrams show Graph one The rate of photosynthesis in a green plant at different wavelengths of light Graph two The estimated absorption of the different wavelengths of light by the different plant pigments - VCE - SSCE Biology - Question 3 - 2008 - Paper 1

Explain why the graph showing the rate of photosynthesis has approximately the same shape as the absorption graphs of the plant pigments.

Name one input item that X could represent.

One output item that Y could represent.

What is the energy yield per molecule of glucose as a result of aerobic respiration?

Within a cell, where does the electron transport stage of aerobic respiration occur?

Describe what happens during the electron transport stage. In your answer include the name of product Z.

Join the SSCE students using SimpleStudy...