Respiration in Plants - Biology Handpicked Short Notes [PDF] 📚

Ruhi Singh
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Respiration in Plants

Respiration is a vital process in plants, similar to humans. It involves the breakdown of organic molecules (like glucose) in the presence of oxygen to release energy. This energy is used for various cellular activities, such as growth, repair, and photosynthesis.


Respiration in Plants - Biology Handpicked Short Notes


Types of Respiration in Plants

1. Aerobic Respiration:

  • Occurs in the presence of oxygen.
  • Involves the complete breakdown of glucose into carbon dioxide and water.
  • Releases a significant amount of energy.
  • The process takes place in the mitochondria of plant cells.
  • Equation: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy

2. Anaerobic Respiration:

  • Occurs in the absence of oxygen.
  • Involves the incomplete breakdown of glucose.
  • Releases a smaller amount of energy compared to aerobic respiration.
  • The process takes place in the cytoplasm of plant cells.
  • Products vary depending on the organism and conditions. Common products include ethanol, lactic acid, and carbon dioxide.

Factors Affecting Respiration

  • Temperature: Higher temperatures generally increase the rate of respiration.
  • Oxygen availability: More oxygen leads to a higher rate of aerobic respiration.
  • Carbon dioxide concentration: High levels of carbon dioxide can inhibit respiration.
  • Water content: Adequate water is essential for respiration.
  • Hormones: Plant hormones can influence respiration rates.

Significance of Respiration in Plants

  • Energy production: Provides energy for various cellular activities.
  • Growth and development: Supplies energy for growth and development.
  • Maintenance: Helps maintain plant health and vitality.
  • Photosynthesis: Respiration provides ATP, which is used to drive the light-independent reactions of photosynthesis.

In summary, respiration is a crucial process in plants, enabling them to obtain energy for their survival and growth. Understanding respiration helps us appreciate the complex metabolic activities that occur within plant cells.

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Respiration in Plants - Biology Handpicked Short Notes
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Respiration in Plants - Biology Handpicked Short Notes
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Respiration in Plants - Biology Handpicked Short Notes

Respiration in Plants - Biology Handpicked Short Notes

Respiration in Plants - Biology Handpicked Short Notes

Respiration in Plants - Biology Handpicked Short Notes

Respiration in Plants - Biology Handpicked Short Notes

Respiration in Plants - Biology Handpicked Short Notes

Respiration in Plants - Biology Handpicked Short Notes

Respiration in Plants - Biology Handpicked Short Notes

Respiration in Plants - Biology Handpicked Short Notes

Respiration in Plants - Biology Handpicked Short Notes

Respiration in Plants - Biology Handpicked Short Notes

FAQs on Respiration in Plants

1. What is the difference between respiration and photosynthesis?

While both involve the exchange of gases, they are opposite processes:

  • Photosynthesis: Plants convert light energy, carbon dioxide, and water into glucose and oxygen.
  • Respiration: Plants break down glucose and oxygen to release energy, carbon dioxide, and water.

2. Why do plants need to respire even though they produce their own food through photosynthesis?

Photosynthesis provides the energy needed for growth and other life processes. However, plants also need to respire to break down the food they produce and release energy for immediate use.

3. Do plants respire only at night?

No, plants respire both day and night. However, during the day, the rate of photosynthesis may be higher than the rate of respiration, leading to a net release of oxygen.

4. Can plants respire without oxygen?

Yes, but this is called anaerobic respiration, which produces less energy than aerobic respiration. Anaerobic respiration can occur in conditions with low oxygen availability, such as waterlogged soils.

5. How does temperature affect plant respiration?

Higher temperatures generally increase the rate of respiration. However, extremely high temperatures can damage plant cells and reduce respiration.

6. Do plants respire through their leaves?

Yes, leaves are a major site of respiration. The stomata, tiny pores on the underside of leaves, allow for the exchange of gases during respiration.

7. How can we measure plant respiration?

One common method is to measure the rate of carbon dioxide production or oxygen consumption. This can be done using specialized equipment, such as a respirometer.

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