The Question is from neet-botany plant-physiology introduction, and it was created by the author K SURESH KUMAR

Question

What is required for the transport of substances through a membrane from a region of lower 
concentration to higher concentration?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Active Transport
	**Related Topics**: Passive transport, concentration gradient, cell membrane
	**Prerequisites**: Understanding of diffusion and basic cell structure
## SOLUTION PATHWAY
**Given Information**:
	Transport of substances from lower to higher concentration.
	This is against the concentration gradient.
**Method & Steps**:
	1. Identify the type of transport: Transport against a concentration gradient requires energy input, characterizing active transport.
		Reasoning: Passive transport moves from high to low concentration without energy input.
	2. Consider the options: Active transport requires energy input.
		Working: Facilitated diffusion is a type of passive transport.
	3. Select the correct option: Based on the analysis, input of energy is required for active transport.
		Result: Option A is the correct answer.
 ## OPTION ANALYSIS
[A] ✓: Active transport requires energy to move molecules against their concentration gradient.
[B] :x: Output of energy is associated with passive transport, not movement against a gradient.
[C] :x: Facilitated diffusion is a passive process that does not require energy input and moves substances down a concentration gradient.
[D] :x: Transport against a concentration gradient always requires energy.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing active and passive transport: Remember active transport requires energy and moves against the gradient, while passive transport doesn't.
		2. Misunderstanding facilitated diffusion: Facilitated diffusion is passive and requires a channel protein, but doesn't require direct energy input.
	**Quick Tips**:
		1. Think 'active' = 'against gradient' = 'energy needed'.
		2. Remember the key difference: Passive moves 'downhill', active moves 'uphill'.

K SURESH KUMAR · Answer

The correct Option is "Input of energy"

K SURESH KUMAR · Answer

Output of energy

K SURESH KUMAR · Answer

Facilitated diffusion

K SURESH KUMAR · Answer

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