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

● ● ● ● ●

Which component of the bacterial cell envelope is responsible for the classification of bacteria into Gram-positive and Gram-negative?

A. Plasma membrane B. Glycocalyx C. Cell wall D. Mesosome

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

Explanation

The NCERT states: 'Bacteria can be classified into two groups on the basis of the differences in the cell envelopes and the manner in which they respond to the staining procedure developed by Gram viz., those that take up the gram stain are Gram positive and the others that do not are called Gram negative bacteria.' The cell wall's composition significantly impacts Gram staining.

● ● ● ● ●

If a bacterium possesses a thick and tough glycocalyx, it is specifically referred to as a:

A. Slime layer B. Capsule C. Cell wall D. Mesosome

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

Explanation

According to the provided text: 'Glycocalyx differs in composition and thickness among different bacteria. It could be a loose sheath called the slime layer in some, while in others it may be thick and tough, called the capsule.'.

● ● ● ● ●

Although each layer of the prokaryotic cell envelope performs distinct functions, they collectively act as:

A. metabolic powerhouse B. single protective unit C. selective permeability barrier only D. structural support system exclusively

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

Explanation

The text explicitly states: 'Although each layer of the envelope performs distinct function, they act together as a single protective unit.'

● ● ● ● ●

Which of the following statements about mycoplasma is correct?

A. It has a well-defined cell wall surrounding the cell membrane. B. It is a prokaryote that lacks a cell wall. C. It is a eukaryotic organism with a complex cell envelope. D. It possesses a thick glycocalyx for protection.

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

Explanation

The NCERT text states: 'prokaryotes have a cell wall surrounding the cell membrane except in mycoplasma.' This indicates that mycoplasma is a prokaryote without a cell wall.

● ● ● ● ●

The Gram staining procedure differentiates bacteria based on differences in their:

A. Cytoplasmic composition B. Genetic material organization C. Cell envelope structure D. Presence or absence of plasmids

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

Explanation

The text mentions: 'Bacteria can be classified into two groups on the basis of the differences in the cell envelopes and the manner in which they respond to the staining procedure developed by Gram...'. Therefore, the cell envelope structure is key.

● ● ● ● ●

A bacterium is observed to take up the Gram stain. This characteristic indicates that the bacterium is:

A. Gram-negative B. Gram-positive C. Acid-fast D. Gram-variable

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

Explanation

The NCERT defines: 'those that take up the gram stain are Gram positive'.

● ● ● ● ●

Which of the following is NOT a characteristic of the prokaryotic cell envelope?

A. It is a tightly bound three-layered structure. B. Each layer performs a distinct function. C. It includes a rigid cell wall in all prokaryotes. D. Its differences lead to Gram-staining classification.

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

Explanation

The text states 'prokaryotes have a cell wall surrounding the cell membrane except in mycoplasma.' This means not all prokaryotes have a cell wall, making the statement 'rigid cell wall in all prokaryotes' incorrect.

● ● ● ● ●

Mesosomes, a specialized differentiated form of cell membrane, are characteristic of prokaryotes and are essentially:

A. Outfoldings of the cell wall B. Infoldings of the plasma membrane C. External appendages for locomotion D. Reserve food material granules

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

Explanation

The NCERT text describes mesosomes as 'A specialised differentiated form of cell membrane called mesosome is the characteristic of prokaryotes. They are essentially infoldings of cell membrane'.

● ● ● ● ●

What is the nature of the glycocalyx if it forms a loose sheath around the bacterial cell?

A. Capsule B. Slime layer C. Cell wall D. Plasma membrane

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

Explanation

The text states: 'It could be a loose sheath called the slime layer in some, while in others it may be thick and tough, called the capsule'.

● ● ● ● ●

Which of the following describes the initial process of urine formation in the nephron?

A. Reabsorption of water and electrolytes B. Filtration of blood by the glomerulus C. Secretion of H+ and K+ into the filtrate D. Concentration of urine in the collecting duct

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

Explanation

The text states, 'Urine formation involves three main processes, i.e., filtration, reabsorption and secretion. Filtration is a non-selective process performed by the glomerulus using the glomerular capillary blood pressure.'

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.