Q.177 Zoology ⭐ 360° Option Elimination Active

NEET 2025 Zoology Question 177 Solution

Topic: Microbes in Human Welfare · Official NTA Booklet Code 45

Question

Which of the following microbes is NOT involved in the preparation of household products? A. Aspergillus niger B. Lactobacillus C. Trichoderma polysporum D. Saccharomyces cerevisiae E. Propionibacterium sharmanii Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (2) : A and C only

📚 Microbes in Human Welfare Easy

📋 Given Parameters & Problem Setup

Candidates A. Aspergillus niger, B. Lactobacillus, C. Trichoderma polysporum, D. Saccharomyces cerevisiae, E. Propionibacterium sharmanii

Target Classification Microbes NOT involved in household products

⚡

The 30-Second Exam Hall Shortcut: ⚡ Household vs Industrial Microbes Fingerprint

⏱️ Save ~20 seconds

Household = Lactobacillus (curd, B), Saccharomyces (bread dough, D), Propionibacterium (Swiss cheese, E)! Industrial = Aspergillus niger (citric acid, A) & Trichoderma polysporum (cyclosporin A, C)! A and C only are NOT household!

1 Check NCERT Chapter 10 headings and sections:

2 - Section 10.1: Microbes in Household Products:

3 * Lactobacillus (LAB): Curd preparation (B). [Household]

4 * Saccharomyces cerevisiae: Dough for bread/idli (D). [Household]

5 * Propionibacterium sharmanii: Large holes in Swiss cheese (E). [Household]

6 - Section 10.2: Microbes in Industrial Products:

7 * Aspergillus niger (fungus): Industrial synthesis of Citric acid (A). [Industrial]

8 * Trichoderma polysporum (fungus): Production of Cyclosporin A (immunosuppressant drug) (C). [Industrial/Medical]

9 Microbes NOT involved in household products = A and C only (Option 2)!

10 Select Option (2)!

🛡️

Why You Can 100% Trust This Shortcut: Microbes in Household Food Processing (NCERT Biology · Microbes in Human Welfare: LAB curdling milk & Propionibacterium swiss cheese).

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Microbes in Household Products (NCERT Section 10.1)

Microorganisms utilized daily in home kitchens and traditional dairy/culinary fermentations:

• B. *Lactobacillus* and other Lactic Acid Bacteria (LAB): Convert milk into curd by producing acids that coagulate and partially digest milk proteins, enriching nutritional value with vitamin B₁₂.
• D. *Saccharomyces cerevisiae* (Baker's yeast): Ferments dough used for making bread, releasing $\text{CO}_2$ to give puffed-up appearance.
• E. *Propionibacterium sharmanii*: Bacterium used in the ripening of Swiss cheese; generates large amounts of $\text{CO}_2$ creating characteristic large holes.
• Thus, B, D, and E are classical household microbes.

Step 2

Microbes in Industrial and Pharmaceutical Production (NCERT Section 10.2)

Microorganisms cultured in massive fermentors for commercial chemicals and pharmaceuticals:

• A. *Aspergillus niger*: A filamentous fungus used for the commercial, industrial-scale aerobic fermentation of citric acid.
• C. *Trichoderma polysporum*: An ascomycete fungus used in industrial biotechnology to biosynthesize Cyclosporin A, a vital bioactive peptide used as an immunosuppressive agent in organ-transplant patients.
• Neither *Aspergillus niger* nor *Trichoderma polysporum* is utilized in domestic household food preparation.

Step 3

Conclusion

The microbes NOT involved in the preparation of household products are A and C only, corresponding to Option (2).

\text{Non-Household Microbes} = \{A\text{ (Aspergillus)}, \; C\text{ (Trichoderma)}\}

⭐

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 A

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Lactobacillus (B) is the most famous household microbe (curd).

⚠️

Student Fallacy (Why candidates pick this trap): Thinking Lactobacillus is an industrial-only microbe.

2 B

✓ 100% Correct

Verdict & Scientific Reason:

100% correct. Accurately segregates industrial acid producer (A) and immunosuppressant drug fungus (C) from domestic food microbes.

💡

Why this is airtight: None; pristine knowledge of applied microbiology.

3 C

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Saccharomyces cerevisiae (D) is baker's yeast used in household bread.

⚠️

Student Fallacy (Why candidates pick this trap): Believing baker's yeast is not a household organism.

4 D

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Propionibacterium sharmanii (E) is used for Swiss cheese in household products.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing cheese bacteria with industrial fermentation.

⚠️

NTA Trap Alert: NCERT Section 10.1 vs 10.2 Grouping

NCERT divides microbes by application: 10.1 Household (Curd, Bread, Toddy, Cheese). 10.2 Industrial (Beverages, Antibiotics, Chemicals like Citric acid, and Bioactive molecules like Cyclosporin A).

🛡️ How to avoid the -1 mark: Citric acid (Aspergillus) & Cyclosporin A (Trichoderma) = Industrial, NOT Household.

📖

Core NEET Syllabus Standard

NEET Biology Core Syllabus · Microbes in Human Welfare Standard Benchmark

Core Scientific Principle Tested:

"Lactobacillus, Saccharomyces, and Propionibacterium are used in household products; Aspergillus and Trichoderma are used industrially."

Syllabus Focus: Microbes in Household Products vs Industrial Products

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

Home = Milk, Bread, Cheese (B, D, E); Factory = Acid & Drugs (A & C)!

Ready to attempt under real exam pressure?

Test your speed and accuracy in the authentic 180-minute timed NTA simulator.

Launch NEET 2025 CBT Test →

← Previous (Q.176) All Zoology Questions Grid Next (Q.178) →

Spotted a mistake in this solution? Report an error (support@mycompetitiveexams.com)

⚖️ Legal & Fair Dealing Notice: Sourced from publicly released NEET 2025 question papers and NEET answer keys for private study, research, and non-commercial educational practice under Fair Dealing (Section 52(1)(a) of the Indian Copyright Act, 1957). Not affiliated with or endorsed by NTA or NMC.

NEET 2025 Zoology Question 177 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Household vs Industrial Microbes Fingerprint

Step-by-Step Rigorous Workflow & Mathematical Proof

Microbes in Household Products (NCERT Section 10.1)

Microbes in Industrial and Pharmaceutical Production (NCERT Section 10.2)

Conclusion

360° Option Elimination Engine Key Feature

NTA Trap Alert: NCERT Section 10.1 vs 10.2 Grouping

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Microbes in Human Welfare

Microbial Bioactive Molecules & Thrombolytic Clot Busters

Microbial Production of Organic Acids, Ethanol, and Bioactive Molecules

Microbial Production of Organic Acids

Anaerobic Sludge Digesters: Treatment of Activated Sludge

Solve 4 NEET Questions a Day — One per Subject