Q.172 Zoology ⭐ 360° Option Elimination Active

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NEET 2024 Zoology Question 172 Solution

Topic: Biotechnology: Principles and Processes · Official NTA Booklet Code T1

Question

Which of the following statements is incorrect?

(1)Bio-reactors are used to produce small scale bacterial cultures.
(2)Bio-reactors have an agitator system, an oxygen delivery system and foam control system.
(3)A bio-reactor provides optimal growth conditions for achieving the desired product.
(4)Most commonly used bio-reactors are of stirring type.

✓

Verified Against NTA Final Answer Key

Option (1) : Bio-reactors are used to produce small scale bacterial cultures.

📚 Biotechnology: Principles and Processes Easy

📋 Given Parameters & Problem Setup

Equipment Bioreactors / Fermenters

Question Identify the INCORRECT statement

⚡

The 30-Second Exam Hall Shortcut: ⚡ Bioreactor Scale Rule

⏱️ Save ~20 seconds

Bioreactors are designed for LARGE SCALE industrial production (100 to 1000 litres), NOT small scale laboratory cultures! Statement (1) is blatantly incorrect!

1 Recall bioreactor specifications in NCERT:

2 - Small scale cultures are grown in laboratory flasks.

3 - To produce in large quantities, development of bioreactors, where large volumes (100-1000 litres) of culture can be processed, was required.

4 Statement (1) claims "used to produce small scale bacterial cultures", which is FALSE!

5 Select Option (1) / A.

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Biotechnology: Principles and Processes (Bioreactors)

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Review Bioreactor Purpose and Scale

Small volume cultures cannot yield appreciable quantities of products. To produce in large quantities, the development of bioreactors, where large volumes ( $100-1000$ litres) of culture can be processed, was required. Thus, bioreactors are specifically built for large-scale production, not small-scale cultures.

Step 2

Examine Bioreactor Systems and Controls

A bioreactor provides optimal conditions for achieving the desired product by providing optimum growth conditions (temperature, pH, substrate, salts, vitamins, oxygen). A stirred-tank reactor is usually cylindrical or with a curved base to facilitate the mixing of the reactor contents. The stirrer facilitates even mixing and oxygen availability throughout the bioreactor. Bioreactors have an agitator system, an oxygen delivery system, a foam control system, a temperature control system, pH control system and sampling ports.

Step 3

Identify the Incorrect Statement

Statement (1) incorrectly states that bioreactors are used for small scale cultures.

⭐

360° Option Elimination Engine Key Feature

Diagnose every choice: Know exactly why the right option works and why distractors fail.

4-Option Deep Scan

1 (1)

✓ 100% Correct

Verdict & Scientific Reason:

Incorrect statement: Bioreactors are industrial vessels designed specifically for large-scale culture (100–1000 litres).

💡

Why this is airtight: None.

2 (2)

✗ Incorrect

Verdict & Scientific Reason:

Correct statement: These are standard engineering components of all industrial bioreactors.

⚠️

Student Fallacy (Why candidates pick this trap): Correct statement: These are standard engineering components of all industrial bioreactors.

3 (3)

✗ Incorrect

Verdict & Scientific Reason:

Correct statement: Bioreactors optimize temperature, pH, substrate, vitamins, and oxygen.

⚠️

Student Fallacy (Why candidates pick this trap): Correct statement: Bioreactors optimize temperature, pH, substrate, vitamins, and oxygen.

4 (4)

✗ Incorrect

Verdict & Scientific Reason:

Correct statement: Stirred-tank bioreactors are the most widely used industrial bioreactors.

⚠️

Student Fallacy (Why candidates pick this trap): Correct statement: Stirred-tank bioreactors are the most widely used industrial bioreactors.

⚠️

NTA Trap Alert: Small Scale vs Lab Flask

Confusing laboratory shaker flasks with industrial bioreactors.

🛡️ How to avoid the -1 mark: Remember: Flasks = small-scale laboratory testing; Bioreactors = large-scale industrial mass production.

📖

Core NEET Syllabus Standard

Biology Core Zoology · Biotechnology: Principles and Processes Standard Benchmark

Core Scientific Principle Tested:

"To produce in large quantities, the development of bioreactors, where large volumes (100-1000 litres) of culture can be processed, was required. A bioreactor provides the optimal conditions for achieving the desired product by providing optimum growth conditions."

Syllabus Focus: Bioreactors: Design, Scale, and Optimal Culturing Parameters

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2024 Zoology Question 172 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Bioreactor Scale Rule

Step-by-Step Rigorous Workflow & Mathematical Proof

Review Bioreactor Purpose and Scale

Examine Bioreactor Systems and Controls

Identify the Incorrect Statement

360° Option Elimination Engine Key Feature

NTA Trap Alert: Small Scale vs Lab Flask

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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