Problem 2 - Biology: Concepts and Applications

Question

Photosynthetic autotrophs use _____ from the air as a carbon source and _____ as their energy source.

Step-by-Step Solution

Answer

Photosynthetic autotrophs use carbon dioxide and sunlight.

Step 1: Identify Carbon Source

Photosynthetic autotrophs, such as plants, use carbon dioxide (CO2) from the air as a carbon source during the process of photosynthesis.

Step 2: Identify Energy Source

These autotrophs utilize sunlight as their energy source to drive the chemical reactions of photosynthesis, where light energy is converted into chemical energy.

Step 3: Formulate the Complete Answer

Having identified the carbon and energy sources, we can conclude that photosynthetic autotrophs use carbon dioxide from the air as a carbon source and sunlight as their energy source.

Key Concepts

Photosynthetic Autotrophs

Photosynthetic autotrophs are fascinating organisms that have the unique ability to make their own food. They include plants, algae, and some types of bacteria. These autotrophs utilize the process of photosynthesis, which allows them to convert light energy, usually from the sun, into chemical energy in the form of glucose.
This characteristic makes them fundamental to life on Earth, as they form the base of most ecosystems by providing energy-rich organic compounds.
To perform photosynthesis, these organisms rely on chlorophyll, a green pigment found in the chloroplasts of plant cells. This pigment absorbs sunlight, making the whole process of creating energy possible.

• Able to produce their own food
• Include plants, algae, and some bacteria
• Essential for ecosystem energy flow

Carbon Dioxide

Carbon dioxide (CO2) is a vital component in the process of photosynthesis. Photosynthetic autotrophs take in carbon dioxide from the air, using it as a building block to form glucose. This process not only helps in sustaining the autotrophs themselves but also plays a crucial role in the global carbon cycle.
During photosynthesis, carbon dioxide is absorbed through small openings in leaves called stomata.
These openings allow gases to enter and exit, facilitating the exchange of carbon dioxide and oxygen, which is a byproduct of photosynthesis.

• Essential for glucose production
• Absorbed through stomata in leaves
• Integral to the carbon cycle

Sunlight Energy

Sunlight is the primary energy source that drives the process of photosynthesis in autotrophs. The light-dependent reactions use sunlight to split water molecules into oxygen, protons, and electrons.
This reaction occurs in the chloroplasts and is essential for the conversion of light energy into chemical energy.
The absorbed sunlight excites electrons in the chlorophyll, leading to a chain of reactions that ultimately results in the formation of ATP and NADPH, energy-rich molecules needed for the second stage of photosynthesis, also known as the Calvin cycle.

• Main energy source for photosynthesis
• Initiates light-dependent reactions
• Produces ATP and NADPH