Movement and accumulation of ions across a membrane against their concentration gradient can be explained by

1. Active Transport

2. Osmosis

3. Facilitated Diffusion

4. Passive Transport

Doubtly Asked 30 Oct 2026 NEET UG 2023 neet Save WhatsApp Report

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Answer: 1. Active Transport

Key idea: Movement of ions against their concentration gradient needs energy (ATP) and carrier proteins, and this is active transport.

Osmosis, facilitated diffusion and other passive transport go down the gradient and need no energy.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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