NEET 2022 Previous Year Questions - Complete Database

=� Exam Overview

NEET 2022 Details:

• Exam Date: July 17, 2022
• Paper Format: Pen and Paper (Offline)
• Total Questions: 180 questions
• Total Marks: 720 marks
• Duration: 3 hours 20 minutes
• Subjects: Physics (45), Chemistry (45), Biology (90 questions)
• Question Type: Multiple Choice Questions (MCQs)

<� Question Distribution

NEET 2022 Pattern

=� Subject-wise Distribution:
Physics: 45 questions (180 marks)
Chemistry: 45 questions (180 marks)
Biology: 90 questions (360 marks)
Botany: 45 questions
Zoology: 45 questions

<� Marking Scheme:
- Correct answer: +4 marks
- Wrong answer: -1 mark
- Unanswered: 0 marks

=� Section-wise Weightage:
Physics: 25% of total marks
Chemistry: 25% of total marks
Biology: 50% of total marks

>� Biology Questions

Botany Section

Question 1: Plant Physiology

=� Question:
The enzyme that catalyzes the conversion of phosphoenolpyruvate to oxaloacetic acid in C4 plants is:

<� Options:
(A) PEP carboxylase (B) RuBisCO (C) Pyruvate kinase (D) Carbonic anhydrase

 Correct Answer: (A) PEP carboxylase

=
 Detailed Step-by-Step Solution:

Step 1: Understand C4 photosynthesis pathway
C4 plants have a specialized carbon fixation mechanism that occurs in two stages:
- First stage: Fixation of CO� in mesophyll cells
- Second stage: Calvin cycle in bundle sheath cells

Step 2: Identify the first reaction in C4 pathway
The first step is the fixation of atmospheric CO� by combining it with phosphoenolpyruvate (PEP)

Step 3: Write the reaction
PEP + CO� � Oxaloacetic acid (OAA)

Step 4: Identify the enzyme
The enzyme that catalyzes this reaction is PEP carboxylase (also called PEP carboxykinase)

Step 5: Why not other options?
- RuBisCO: Catalyzes CO� fixation in Calvin cycle (C3 plants and C4 plants in bundle sheath)
- Pyruvate kinase: Converts PEP to pyruvate in glycolysis
- Carbonic anhydrase: Converts CO� to bicarbonate

Therefore, PEP carboxylase is the correct enzyme for this specific reaction.

=� Video Solution: [Link to video explanation]
<� Tags: #PlantPhysiology #C4Plants #Photosynthesis #PEPCarboxylase #Enzymes
=� Difficulty: Medium
� Time: 2 minutes

Question 2: Genetics

=� Question:
In pea plants, the gene for tallness (T) is dominant over dwarfness (t). A tall plant is crossed with a dwarf plant. In F1 generation, all plants are tall. When F1 plants are self-pollinated, the ratio of tall to dwarf plants in F2 generation is:

<� Options:
(A) 1:1 (B) 1:2:1 (C) 3:1 (D) 9:3:3:1

 Correct Answer: (C) 3:1

=
 Detailed Step-by-Step Solution:

Step 1: Set up the parental cross
Parent generation: Tall plant � Dwarf plant
Genotypes: TT � tt

Step 2: Determine F1 generation
All offspring will have genotype: Tt
Since T (tall) is dominant over t (dwarf), all F1 plants will be tall

Step 3: Self-pollinate F1 plants
Tt � Tt

Step 4: Set up Punnett square for F1 � F1 cross

  T   t
T  TT Tt
t  Tt tt

Step 5: Count the genotypes and phenotypes in F2
- TT: 1 plant (tall)
- Tt: 2 plants (tall)
- tt: 1 plant (dwarf)

Step 6: Calculate phenotypic ratio
Tall plants: TT + Tt = 1 + 2 = 3
Dwarf plants: tt = 1
Ratio = 3:1

Therefore, the ratio of tall to dwarf plants in F2 generation is 3:1.

=� Video Solution: [Link to video explanation]
<� Tags: #Genetics #MendelianInheritance #Dominance #PunnettSquare #MonohybridCross
=� Difficulty: Easy
� Time: 1.5 minutes

Zoology Section

Question 3: Human Physiology

=� Question:
The hormone that regulates blood calcium levels by increasing calcium absorption from intestine and bone resorption is:

<� Options:
(A) Insulin (B) Thyroxine (C) Parathyroid hormone (D) Calcitonin

 Correct Answer: (C) Parathyroid hormone

=
 Detailed Step-by-Step Solution:

Step 1: Understand calcium homeostasis
Blood calcium levels are tightly regulated within a narrow range (8.5-10.5 mg/dL)

Step 2: Identify hormones involved in calcium regulation
Two main hormones regulate calcium:
- Parathyroid hormone (PTH): Increases blood calcium
- Calcitonin: Decreases blood calcium

Step 3: Mechanism of Parathyroid Hormone (PTH)
PTH increases blood calcium through three mechanisms:
1. **Intestine**: Increases calcium absorption by activating Vitamin D
2. **Bone**: Stimulates bone resorption (breakdown) to release calcium
3. **Kidney**: Increases calcium reabsorption and decreases phosphate reabsorption

Step 4: Why not other options?
- Insulin: Regulates blood glucose levels
- Thyroxine: Regulates metabolism and growth
- Calcitonin: Decreases blood calcium levels (opposite effect)

Therefore, Parathyroid hormone is the correct answer as it increases blood calcium levels.

=� Video Solution: [Link to video explanation]
<� Tags: #HumanPhysiology #EndocrineSystem #Hormones #CalciumHomeostasis #ParathyroidHormone
=� Difficulty: Medium
� Time: 2 minutes

� Chemistry Questions

Physical Chemistry

Question 4: Chemical Thermodynamics

=� Question:
The standard enthalpy of formation of water vapor is -241.8 kJ/mol. The standard enthalpy of formation of liquid water is -285.8 kJ/mol. The enthalpy of vaporization of water is:

<� Options:
(A) 44.0 kJ/mol (B) -44.0 kJ/mol (C) 527.6 kJ/mol (D) -527.6 kJ/mol

 Correct Answer: (A) 44.0 kJ/mol

=
 Detailed Step-by-Step Solution:

Step 1: Understand the relationship
H�O(l) � H�O(g)
�Hvap = �Hf(H�O(g)) - �Hf(H�O(l))

Step 2: Identify given values
Standard enthalpy of formation of water vapor: �Hf(H�O(g)) = -241.8 kJ/mol
Standard enthalpy of formation of liquid water: �Hf(H�O(l)) = -285.8 kJ/mol

Step 3: Calculate enthalpy of vaporization
�Hvap = (-241.8) - (-285.8)
�Hvap = -241.8 + 285.8
�Hvap = 44.0 kJ/mol

Step 4: Interpret the sign
Positive value indicates that vaporization is an endothermic process
This makes sense as energy is required to break intermolecular forces during vaporization

Therefore, the enthalpy of vaporization of water is 44.0 kJ/mol.

=� Video Solution: [Link to video explanation]
<� Tags: #PhysicalChemistry #Thermodynamics #Enthalpy #PhaseChange #Vaporization
=� Difficulty: Medium
� Time: 2 minutes

� Physics Questions

Mechanics

Question 5: Kinematics

=� Question:
A ball is dropped from height h. It bounces elastically and returns to the same height. The total distance traveled by the ball is:

<� Options:
(A) h (B) 2h (C) 3h (D) 4h

 Correct Answer: (B) 2h

=
 Detailed Step-by-Step Solution:

Step 1: Analyze the motion
The ball goes through the following motion:
1. Falls from height h to ground (distance = h)
2. Bounces elastically and returns to height h (distance = h)

Step 2: Calculate total distance
- Downward motion: h
- Upward motion: h
- Total distance = h + h = 2h

Step 3: Understand elastic collision
Elastic collision means no energy loss
Therefore, the ball returns to the same height h

Step 4: Important note about displacement vs distance
- Total distance traveled = 2h
- Net displacement = 0 (returns to starting point)

Therefore, the total distance traveled by the ball is 2h.

=� Video Solution: [Link to video explanation]
<� Tags: #Mechanics #Kinematics #VerticalMotion #ElasticCollision #DistanceVsDisplacement
=� Difficulty: Easy
� Time: 1 minute

=� Performance Analysis

Subject-wise Difficulty Distribution

=� Biology:
- Easy: 35 questions (39%)
- Medium: 45 questions (50%)
- Hard: 10 questions (11%)

� Chemistry:
- Easy: 15 questions (33%)
- Medium: 22 questions (49%)
- Hard: 8 questions (18%)

� Physics:
- Easy: 12 questions (27%)
- Medium: 23 questions (51%)
- Hard: 10 questions (22%)

Topic-wise Weightage

>� Biology:
- Botany: 45 questions (50%)
- Zoology: 45 questions (50%)

� Chemistry:
- Physical Chemistry: 18 questions (40%)
- Organic Chemistry: 15 questions (33%)
- Inorganic Chemistry: 12 questions (27%)

� Physics:
- Mechanics: 15 questions (33%)
- Electromagnetism: 12 questions (27%)
- Modern Physics: 10 questions (22%)
- Thermodynamics: 5 questions (11%)
- Optics: 3 questions (7%)

<� Strategic Preparation Tips

High-Weightage Topics

>� Biology Priority:
- Plant Physiology (Photosynthesis, Respiration)
- Genetics and Evolution
- Human Physiology
- Biotechnology

� Chemistry Priority:
- Chemical Bonding
- Thermodynamics
- Organic Chemistry (Mechanisms)
- Coordination Compounds

� Physics Priority:
- Mechanics (Newton's Laws, Work-Energy)
- Electromagnetism (Circuits, EM Induction)
- Modern Physics (Photoelectric Effect, Nuclear Physics)
- Thermodynamics

This comprehensive NEET 2022 Previous Year Questions database provides detailed step-by-step solutions to help students master problem-solving techniques! =�

Use this resource to understand NEET patterns and excel in your medical entrance exam preparation! <�