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Questions
1. Explain how plants grow and what they need to survive.
2. Explain the process of photosynthesis and how it helps plants to make food.
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1 Reply
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1) Answer:
Plants grow through a process called photosynthesis, which involves converting sunlight, water, and carbon dioxide into glucose (a type of sugar) and oxygen. This process occurs in specialized plant structures called chloroplasts, which contain a pigment called chlorophyll that captures sunlight.
Here’s a simplified explanation of the steps involved in plant growth:
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Sunlight: Plants need sunlight for photosynthesis. Sunlight provides the energy required to convert carbon dioxide and water into glucose.
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Water: Water is crucial for plants as it serves as a medium for transporting nutrients and minerals from the soil to different parts of the plant. It also plays a key role in photosynthesis.
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Carbon Dioxide: Plants take in carbon dioxide from the air through tiny openings called stomata on their leaves. Carbon dioxide is combined with water in the presence of sunlight to produce glucose and oxygen.
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Photosynthesis: Inside the chloroplasts, chlorophyll absorbs sunlight, which initiates a series of chemical reactions. During these reactions, carbon dioxide and water molecules are broken down, and glucose and oxygen are synthesized. Glucose serves as the primary source of energy for the plant and is used for growth and development.
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Nutrients and Minerals: Plants require essential nutrients and minerals for their growth. These nutrients are absorbed from the soil through the plant’s roots and are transported to different parts of the plant through a network of vessels.
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Growth and Development: As plants receive energy from glucose, they utilize it for various processes such as cell division, cell elongation, and the formation of new tissues. This leads to overall plant growth, including the development of leaves, stems, roots, and flowers
2) Answer :
Photosynthesis is the process by which plants, algae, and some bacteria convert sunlight, water, and carbon dioxide into glucose (a type of sugar) and oxygen. It is a fundamental process for plant growth and the primary source of energy for most life on Earth. Here’s a step-by-step explanation of the process of photosynthesis:
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Absorption of Sunlight: Plants have specialized structures called chloroplasts, which contain a pigment called chlorophyll. Chlorophyll absorbs sunlight, particularly in the red and blue regions of the electromagnetic spectrum.
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Light-dependent Reactions: When sunlight is absorbed by chlorophyll, it excites electrons in the chlorophyll molecules. These energized electrons are then passed through a series of electron carriers within the chloroplasts. As they move through this electron transport chain, their energy is harnessed to generate adenosine triphosphate (ATP), a molecule that stores and transports energy within cells.
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Splitting of Water: In the presence of light, water molecules (H2O) are split into hydrogen ions (H+), electrons (e-), and oxygen (O2). This process is known as photolysis or the light-dependent splitting of water. The released oxygen is a byproduct and is released into the atmosphere.
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Formation of ATP and NADPH: During the light-dependent reactions, the excited electrons, generated by the absorption of sunlight, are used to produce ATP. Additionally, the hydrogen ions released from water combine with an electron carrier molecule called NADP+ (nicotinamide adenine dinucleotide phosphate) to form NADPH.
It’s important to note that oxygen is also released during photosynthesis as a byproduct. This oxygen is released into the atmosphere, contributing to the oxygen levels that support aerobic respiration for other organisms.
Overall, photosynthesis is a vital process for plants as it allows them to convert sunlight, water, and carbon dioxide into glucose, which serves as a source of energy and building blocks for the plant’s growth and survival.
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This reply was modified 1 year, 10 months ago by Roshani Bhogan.
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