Most of a plant’s biomass comes mainly from the sun’s energy.
a. true
b. false
The Correct Answer and Explanation is :
Answer: a. true
The statement that most of a plant’s biomass comes from the sun’s energy is true. Plants are autotrophic organisms, meaning they can produce their own food through the process of photosynthesis. During photosynthesis, plants convert light energy from the sun into chemical energy in the form of glucose, which serves as a primary energy source for the plant.
The process begins when chlorophyll, the green pigment in plant leaves, absorbs sunlight. This light energy is then used to convert carbon dioxide from the air and water from the soil into glucose and oxygen. The overall equation for photosynthesis can be summarized as:
[
6 \text{CO}2 + 6 \text{H}_2\text{O} + \text{light energy} \rightarrow \text{C}_6\text{H}{12}\text{O}_6 + 6 \text{O}_2
]
Here, ( \text{C}6\text{H}{12}\text{O}_6 ) represents glucose, which is a simple sugar and the fundamental building block for plant biomass.
Most of the biomass that forms in plants—such as stems, leaves, roots, and flowers—stems from the glucose produced during photosynthesis. This glucose can be converted into various structural components, such as cellulose (a key component of plant cell walls) and lignin (which adds strength and rigidity). These compounds contribute significantly to the overall biomass of the plant.
Furthermore, plants utilize the energy stored in glucose for growth and reproduction, leading to an increase in biomass over time. As such, the process of photosynthesis not only supports the life of the individual plant but also forms the foundation of food webs and ecosystems, providing energy and resources for herbivores and, subsequently, carnivores.
In summary, the sun’s energy is crucial for the formation of plant biomass, making the statement true.