Q.123 Botany ⭐ 360° Option Elimination Active

NEET 2025 Botany Question 123 Solution

Topic: Human Reproduction · Official NTA Booklet Code 45

Question

Find the correct statements: A. In human pregnancy, the major organ systems are formed at the end of 12 weeks. B. In human pregnancy the major organ systems are formed at the end of 8 weeks. C. In human pregnancy heart is formed after one month of gestation. D. In human pregnancy, limbs and digits develop by the end of second month. E. In human pregnancy the appearance of hair is usually observed in the fifth month. Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (4) : A, C, D and E Only

📚 Human Reproduction Medium

📋 Given Parameters & Problem Setup

Statement A Major organ systems formed at the end of 12 weeks.

Statement B Major organ systems formed at the end of 8 weeks.

Statement C Heart is formed after one month of gestation.

Statement D Limbs and digits develop by the end of second month.

Statement E Appearance of hair is usually observed in the fifth month.

⚡

The 30-Second Exam Hall Shortcut: ⚡ Gestational Milestones Fingerprint

⏱️ Save ~30 seconds

1 month = Heart (C); 2 months = Limbs & Digits (D); 12 weeks (3 months) = Major organ systems & external genitalia (A true, B false); 5th month = First movement & Hair on head (E)! Statements A, C, D, and E are CORRECT!

1 Check each gestational milestone against NCERT timeline:

2 - C: After 1 month -> Embryo heart is formed. [CORRECT]

3 - D: End of 2nd month -> Foetus develops limbs and digits. [CORRECT]

4 - A: End of 12 weeks (first trimester) -> Most major organ systems formed (limbs, external genitalia). [CORRECT]

5 - B: Major organ systems at 8 weeks? False, that is at 12 weeks! [INCORRECT]

6 - E: Fifth month -> First fetal movement and appearance of hair on the head. [CORRECT]

7 Statements A, C, D, and E Only are correct (Option 4)!

8 Select Option (4)!

🛡️

Why You Can 100% Trust This Shortcut: Human Fertilization & Polyspermy Prevention (NCERT Biology · Human Reproduction: Cortical reaction and zona pellucida hardening).

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Review of NCERT Embryonic Gestational Milestones

Human gestation lasts 9 months (3 trimesters / ~38 weeks). NCERT documents the following precise developmental milestones:

• After 1 month of pregnancy: The embryo's heart is formed. The first sign of growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. Hence, Statement C is correct.
• By the end of the second month of pregnancy (8 weeks): The foetus develops limbs and digits. Hence, Statement D is correct.
• By the end of 12 weeks (first trimester): Most of the major organ systems are formed, for example, the limbs and external genital organs are well-developed. Hence, Statement A is correct, and Statement B (which claims 8 weeks) is incorrect.
• During the fifth month: The first movements of the foetus and appearance of hair on the head are usually observed. Hence, Statement E is correct.
• By the end of 24 weeks (second trimester): The body is covered with fine hair, eye-lids separate, and eyelashes are formed.
• By the end of 9 months: The foetus is fully developed and is ready for delivery.

Step 2

Synthesis of Truth Values

Evaluating all five candidate statements:

• A: Correct (12 weeks = major organ systems).
• B: Incorrect (contradicts 12 weeks milestone).
• C: Correct (1 month = heart formed).
• D: Correct (end of 2nd month = limbs and digits).
• E: Correct (5th month = hair on head observed).

Step 3

Conclusion

Statements A, C, D, and E Only are correct. This corresponds unambiguously to Option (4).

\text{Correct Statements} = \{A, C, D, E\} \implies \text{Option (4)}

⭐

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. Omit statements C and D, both of which are true canonical facts.

⚠️

Student Fallacy (Why candidates pick this trap): Overlooking early first-trimester embryonic milestones.

2 B

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Includes false statement B (major organs form at 12 weeks, not 8 weeks) and omits A, D, and E.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing 8 weeks (limbs/digits) with 12 weeks (major organ systems).

3 C

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Incorrectly incorporates statement B instead of statement A.

⚠️

Student Fallacy (Why candidates pick this trap): Failing to eliminate the false 8-week claim.

4 D

✓ 100% Correct

Verdict & Scientific Reason:

100% correct. Perfectly identifies all four valid embryological milestones and excludes false statement B.

💡

Why this is airtight: None; master-level familiarity with gestation chronology.

⚠️

NTA Trap Alert: 8 Weeks vs 12 Weeks Milestone Confusion

At 8 weeks (end of 2nd month), limbs and digits develop. At 12 weeks (end of 1st trimester), major organ systems and external genitalia are formed! Statements A and B are mutually contradictory; only A is correct!

🛡️ How to avoid the -1 mark: Remember: 8 weeks = Digits; 12 weeks = Organ systems!

📖

Core NEET Syllabus Standard

NEET Biology Core Syllabus · Human Reproduction Standard Benchmark

Core Scientific Principle Tested:

"Heart forms at 1 month, limbs/digits by 2 months, major organ systems by 12 weeks, and head hair during 5th month."

Syllabus Focus: Pregnancy and Embryonic Development · Timeline of Foetal Development

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

1-Heart, 2-Digits, 12w-Organs, 5m-Hair: A, C, D, E are spot on!

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NEET 2025 Botany Question 123 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Gestational Milestones Fingerprint

Step-by-Step Rigorous Workflow & Mathematical Proof

Review of NCERT Embryonic Gestational Milestones

Synthesis of Truth Values

Conclusion

360° Option Elimination Engine Key Feature

NTA Trap Alert: 8 Weeks vs 12 Weeks Milestone Confusion

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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