🔥 NEET 2015 Biology PYQs: Questions Every NEET Aspirant Must Master

7 days ago

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Learn the Question. Understand the Concept. Master NEET Biology.

Are you preparing for NEET and looking for the most valuable Biology Previous Year Questions?

NEET Biology is not just about memorising answers. A single PYQ can help you understand an entire NCERT concept, chapter and question pattern.

The NEET 2015 Biology paper contains several concept-based questions that can help aspirants revise important areas such as Genetics, Molecular Biology, Cell Biology, Human Physiology and Plant Morphology.

In this blog, Pentagon Institute breaks down selected NEET 2015 Biology PYQs in a simple

and student-friendly way.

For every question, you will learn:

📌 The Question

✅ The Correct Answer

📚 The Chapter

🔍 Detailed Solution

💡 The Core Concept

🌱 An Easy Example

🎯 A Quick NEET Revision Tip

Let's start learning!

🧬 1. Mendel's Pea Plant Experiment – Do You Remember All 7 Characters?

📌 The Question

In his classic experiments on pea plants, Mendel did not use which of the following characters?

Seed shape
Seed colour
Flower position
Pod length

✅ Correct Answer: Pod Length

📚 Chapter

Principles of Inheritance and Variation

🔍 The Solution

Gregor Johann Mendel performed his famous inheritance experiments using the garden pea, Pisum sativum.

He selected seven pairs of contrasting characters.

These were:

Character	Dominant Trait	Recessive Trait
Stem height	Tall	Dwarf
Flower colour	Violet	White
Flower position	Axial	Terminal
Pod shape	Inflated	Constricted
Pod colour	Green	Yellow
Seed shape	Round	Wrinkled
Seed colour	Yellow	Green

Pod length was not one of Mendel's seven contrasting characters.

Therefore:

🎯 Correct Answer → Pod Length

💡 Easy Way to Understand

Mendel selected characters that were:

Clearly visible
Easily distinguishable
Available in contrasting forms
Suitable for controlled breeding

🌱 Example

If NEET asks:

Which character was studied by Mendel?

✔ Seed shape✔ Flower position✔ Seed colour

❌ Pod length

🎯 NEET Quick Tip

Don't only learn Mendel's laws.

Memorise all 7 contrasting characters.

Direct NCERT-based questions are frequently asked from this topic.

🧪 2. DNA vs RNA – Can Chargaff's Rule Apply to RNA?

📌 The Question

Which of the following is generally not applicable to RNA?

Nitrogenous bases
5' phosphate and 3' hydroxyl ends
Chargaff's rule
Nucleotide structure

✅ Correct Answer: Chargaff's Rule

📚 Chapter

Molecular Basis of Inheritance

🔍 The Solution

Chargaff's rule is mainly applicable to double-stranded DNA.

According to this rule:

A = T

G = C

Therefore:

A + G = T + C

RNA generally exists as a single-stranded molecule.

RNA contains:

Adenine (A)
Uracil (U)
Guanine (G)
Cytosine (C)

Since RNA is generally single stranded, we cannot assume:

A = U

G = C

Therefore:

🎯 Correct Answer → Chargaff's Rule

💡 Quick Concept

🧬 DNA

A ↔ T

G ↔ C

🧬 RNA

A ↔ U

G ↔ C

🌱 Example

Suppose double-stranded DNA contains:

Adenine = 30%

Then:

Thymine = 30%

Remaining percentage = 40%

Therefore:

Guanine = 20%

Cytosine = 20%

This calculation is possible because of Chargaff's rule.

🎯 NEET Quick Tip

Remember:

DNA → Thymine

RNA → Uracil

🔬 3. Prokaryotic Cell – What Is Missing?

📌 The Question

Which structure is absent in a prokaryotic cell?

Plasma membrane
Ribosomes
Nuclear envelope
Genetic material

✅ Correct Answer: Nuclear Envelope

📚 Chapter

Cell: The Unit of Life

🔍 The Solution

Prokaryotic organisms such as bacteria do not have a true membrane-bound nucleus.

Their genetic material is present in a region called the:

Nucleoid

Therefore, prokaryotic cells contain:

✔ Plasma membrane✔ Cytoplasm✔ Ribosomes✔ Genetic material

But they lack:

❌ Nuclear envelope❌ Mitochondria❌ Golgi apparatus❌ Endoplasmic reticulum

💡 The Main Concept

Prokaryotic Cell

No membrane-bound nucleus

Eukaryotic Cell

True membrane-bound nucleus

🌱 Example

Bacteria are prokaryotic.

Therefore:

Ribosomes → Present

Nuclear membrane → Absent

This is a common NEET trap.

🎯 NEET Quick Tip

Remember:

Prokaryotes have ribosomes.

But:

They do not have membrane-bound organelles.

🌸 4. Axile Placentation – Can You Identify the Correct Example?

📌 The Question

Axile placentation is found in:

✅ Correct Answer: Lemon

📚 Chapter

Morphology of Flowering Plants

🔍 The Solution

Placentation refers to the arrangement of ovules inside the ovary.

In axile placentation, ovules are attached to the central axis.

The ovary is divided into chambers.

Important examples include:

🍅 Tomato🍋 Lemon🍊 Orange

Therefore:

🎯 Correct Answer → Lemon

💡 Other Placentation Examples

Marginal Placentation

🌱 Pea

Axile Placentation

🍅 Tomato🍋 Lemon🍊 Orange

Parietal Placentation

🌿 Mustard🌿 Argemone

Free Central Placentation

🌸 Dianthus

Basal Placentation

🌻 Sunflower

🎯 NEET Quick Tip

Create a short revision table:

Placentation → Example

This is one of the easiest ways to score marks from Morphology.

👁️ 5. Fovea – Where Is Your Sharpest Vision?

📌 The Question

The fovea is the region of the retina where:

✅ Correct Answer

Cone cells are present in high density, while rods are absent.

📚 Chapter

Neural Control and Coordination

🔍 The Solution

The retina contains specialised photoreceptors:

👁️ Rods

Responsible mainly for:

Dim-light vision
Night vision
Black-and-white vision

🌈 Cones

Responsible mainly for:

Colour vision
Sharp vision
Bright-light vision

The fovea contains a high density of cone cells.

Therefore, it is responsible for the sharpest vision.

🌱 Easy Example

When you read small letters clearly in bright light, your sharp vision depends on the cone-rich region of the retina.

⚡ Quick Comparison

Structure	Main Function
Fovea	Sharpest vision
Blind spot	No photoreceptors
Rods	Dim-light vision
Cones	Colour and sharp vision

🎯 NEET Quick Tip

Remember this:

Fovea = Fine Vision

Blind Spot = No Vision

🌱 6. Root Pressure – How Does Water Enter the Root?

📌 Concept-Based Question

Root pressure is mainly related to which process?

✅ Correct Concept: Active absorption of mineral ions followed by osmotic water movement

📚 Chapter

Transport in Plants

🔍 Step-by-Step Solution

Step 1: Mineral ions enter the root

Root cells actively absorb mineral ions.

⬇️

Step 2: Solute concentration increases

The concentration of solutes inside root cells increases.

⬇️

Step 3: Water potential decreases

Water moves towards the region with lower water potential.

⬇️

Step 4: Water enters through osmosis

Water enters the root cells.

⬇️

Step 5: Pressure develops

This positive pressure is called:

🌱 ROOT PRESSURE

🌱 Example

Root pressure can contribute to water movement when transpiration is low and is associated with phenomena such as guttation under suitable conditions.

🎯 NEET Quick Tip

Revise root pressure together with:

Osmosis
Water potential
Active transport
Transpiration
Cohesion
Adhesion

These concepts are often connected in NEET questions.

🧠 What Should You Learn from NEET 2015 Biology PYQs?

Every Previous Year Question should teach you more than one answer.

For example:

Question: Fovea

Don't just remember:

Answer → Cone cells

Also remember:

✔ Chapter → Neural Control and Coordination✔ Concept → Photoreceptors✔ Related topic → Rods and cones✔ Example → Sharp vision

This is how one question can help you revise an entire concept.

🚀 The Smart PYQ Method for NEET Biology

Use this method while solving every PYQ:

1️⃣ Identify the Chapter

Ask:

Where does this question come from?

2️⃣ Identify the Core Concept

Ask:

What exactly is NEET testing?

3️⃣ Understand the Solution

Don't memorise blindly.

Understand the biological process.

4️⃣ Connect It With an Example

Examples make Biology easier to remember.

5️⃣ Revise the Related NCERT Topic

Go back and read the connected concept.

🏆 The Pentagon Institute NEET Learning Formula

📖 Read NCERT

⬇️

💡 Understand the Concept

⬇️

✍️ Practice MCQs

⬇️

🔥 Solve Previous Year Questions

⬇️

❌ Analyse Mistakes

⬇️

🔁 Revise Again

⬇️

🎯 Build Strong NEET Biology Concepts

Final Takeaway

The most successful NEET students don't just remember questions.

They understand:

📚 Where the question comes from

💡 What concept is being tested

🔍 Why the answer is correct

🌱 Where else the concept can be applied

NEET 2015 Biology PYQs are valuable because they allow students to practise this exact process.

So, don't study PYQs as a list of questions and answers.

Study them as:

🔥 Question → Chapter → Concept → Solution → Example → Revision

With regular NCERT revision, concept clarity and consistent PYQ practice, NEET Biology can become one of the strongest scoring subjects.

❓Frequently Asked Questions

Are NEET 2015 Biology PYQs still useful?

Yes. They are useful for understanding concepts, NCERT-based questions and the style in which Biology topics can be tested.

Should I memorise NEET PYQ answers?

No. Always understand the concept behind the answer.

Which chapters should I revise after solving PYQs?

Revise the complete related chapter, especially the exact NCERT concept connected with the question.

Are examples important in NEET Biology?

Yes. Examples are particularly important in chapters such as Plant Kingdom, Biological Classification and Morphology of Flowering Plants.

🚀 Study Smart. Understand Deeply. Perform Better.