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Comparison of Different Transport Processes
- Simple diffusion does not require the assistance of proteins for passage through the membrane.
- Both facilitated diffusion and active transport are mediated through membrane proteins.
- Active transport requires ATP energy.
- It is also uphill transport.
- Facilitated transport does not require ATP energy.
- It usually occurs along the concentration gradient.
- The protein transporters of both facilitated diffusion and active transport are highly selective.
- They are liable to get saturated and respond to inhibitors as well as hormonal regulation.
PLANT - WATER RELATIONS
- Water is a major component of all living cells, a medium in which all substances are dissolved and undergo various types of reactions.
- Water is itself a reactant as well as a product.
- It is a medium for transport.
- Water is essential for cell growth and cell turgidity.
- Most herbaceous plants contain 85-90 % water while Water Melon has 92 % water.
- In trees and shrubs the woody parts have relatively lower amount of water while the softer parts have quite a large amount of it.
- A seed which appears dry has 10–15 % water.
- Without this water, it will stop respiring and die.
- The amount of water absorbed by a plant is very high.
- For example, a Maize or Corn plant absorbs about 3 litres of water per day while a Mustard plant would absorb water equal to its weight in just five hours.
- The amount of water absorbed by larger sized plants is very large, 36-45 litres in Apple and more than 1 tonne per day in Elm tree.
- Because of this huge requirement of water, it is often a limiting factor for plant growth and productivity both in agriculture and natural ecosystems.
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