Blog Log in Get Started Free

Zoology MCQs for NEET — Practice Questions with Answers

Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

Chapter Language Difficulty Show only questions I answered incorrectly Register free to filter questions

● ● ● ● ●

The statement 'O$_2$ gets bound to haemoglobin in the lung surface and gets dissociated at the tissues' implies:

A. Haemoglobin has a constant affinity for oxygen. B. The affinity of haemoglobin for oxygen changes based on the physiological environment. C. Oxygen is permanently bound to haemoglobin after reaching the lungs. D. Dissociation only occurs at extremely low $pO_2$ levels.

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

This statement directly reflects the dynamic nature of oxygen-haemoglobin binding, where affinity changes based on local conditions ($pO_2$, $pCO_2$, H+ concentration, temperature). This is the core concept explained by the oxygen dissociation curve and its shifts.

● ● ● ● ●

If the oxygen dissociation curve shifts to the left, it indicates:

A. Decreased affinity of haemoglobin for oxygen B. Increased affinity of haemoglobin for oxygen C. No change in haemoglobin's affinity for oxygen D. Increased oxygen release to tissues

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

A leftward shift of the oxygen dissociation curve signifies that for a given $pO_2$, haemoglobin is more saturated with oxygen, meaning it has a higher affinity for oxygen and holds onto it more tightly.

● ● ● ● ●

Which of the following characteristics is NOT found in organisms belonging to Class Chondrichthyes?

A. Cartilaginous endoskeleton B. Ventral mouth C. Presence of operculum D. Persistent notochord throughout life

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

According to the NCERT text, 'Gill slits are separate and without operculum (gill cover)' in Class Chondrichthyes. Therefore, the presence of an operculum is not a characteristic of this class.

● ● ● ● ●

The tough skin of Chondrichthyes is characterized by the presence of:

A. Cycloid scales B. Ctenoid scales C. Placoid scales D. Ganoid scales

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The NCERT states, 'The skin is tough, containing minute placoid scales' for Class Chondrichthyes. Teeth are also modified placoid scales.

● ● ● ● ●

Why do Chondrichthyes need to swim constantly?

A. To maintain temperature regulation B. To obtain sufficient oxygen through gill slits C. To avoid sinking due to the absence of an air bladder D. To facilitate reproduction and larval dispersal

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The NCERT text explicitly states, 'Due to the absence of air bladder, they have to swim constantly to avoid sinking.' This highlights a key adaptation of cartilaginous fish.

● ● ● ● ●

In Chondrichthyes, the notochord is:

A. Replaced by a bony vertebral column in adults B. Absent in the embryonic period C. Present only in the larval tail D. Persistent throughout life

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The NCERT mentions, 'Notochord is persistent throughout life' in Class Chondrichthyes, differentiating them from most other vertebrates where it's largely replaced.

● ● ● ● ●

Which of the following represents an example of a cartilaginous fish?

A. Branchiostoma B. Petromyzon C. Scoliodon D. Ascidia

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Figure 4.19 illustrates 'Example of Cartilaginous fishes: (a) Scoliodon (b) Pristis'. Petromyzon is a cyclostome, Branchiostoma is a cephalochordate, and Ascidia is a urochordate.

● ● ● ● ●

Chondrichthyes belong to which superclass?

A. Agnatha B. Tetrapoda C. Pisces D. Urochordata

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The NCERT states, 'Gnathostomata has two super classes, Pisces and Tetrapoda. Classes Chondrichthyes and Osteichthyes bear fins for locomotion and are grouped under Pisces.' This places Chondrichthyes under the superclass Pisces.

● ● ● ● ●

Teeth in Chondrichthyes are modified from:

A. Gill arches B. Vertebrae C. Placoid scales D. Cartilaginous rings

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The NCERT mentions, 'Teeth are modified placoid scales which are backwardly directed' in Class Chondrichthyes.

● ● ● ● ●

Which statement correctly describes the mouth position in Chondrichthyes?

A. Terminal B. Dorsal C. Lateral D. Ventral

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The NCERT text states, 'Mouth is located ventrally' for Class Chondrichthyes.

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every Zoology question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.