Blog Log in Get Started Free

Botany MCQs for NEET — Practice Questions with Answers

Practice free Botany 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

● ● ● ● ●

An action spectrum of photosynthesis was first described by:

Jan Ingenhousz

Julius von Sachs

T.W. Engelmann

Cornelius van Niel

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

Explanation

Read page 208, XI NCERT

● ● ● ● ●

Dark reactions of photosynthesis are actually not totally independent of light as:

The initial reactions occur in the presence of light.

The reaction will be inhibited by the presence of light.

They can occur during the day as well.

They utilize the products of the light reaction.

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

Explanation

Read page 209, XI NCERT

● ● ● ● ●

All the following regarding the role of xanthophylls and carotenoids in photosynthesis are correct except:

They act as accessory pigments

Their peak absorption is in blue and red regions of VIBGYOR

They enable a wider range of wavelength of incoming light to be utilized for photosynthesis

They protect chlorophyll a form of photo-oxidation.

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

Explanation

Read page 211, XI NCERT

● ● ● ● ●

The chloroplast stroma lamella membrane:

Lack PS II as well as NADP reductase enzyme.

Lack PS II but have NADP reductase enzyme.

Lack NADP reductase enzyme but have PS II.

Have PS II as well as NADP reductase enzyme.

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

Explanation

Read page 213, XI NCERT

● ● ● ● ●

Which stage of the Calvin Cycle utilizes ATP?

Carboxylation

Reduction

Regeneration

Both 2 and 3

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

Explanation

Read page 217, XI NCERT

● ● ● ● ●

Which of the following are special features of the C₄ plants?

I. They have a special type of leaf anatomy.

II. They tolerate higher temperatures and show a response to high light intensities.

III. They lack photorespiration and have greater productivity of biomass.

Only I and II

Only I and III

Only II and III

I, II and III

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

Explanation

Read page 218, XI NCERT

● ● ● ● ●

Consider the situation where photosynthesis is going on at a steady pace in a typical experiment with a light on, and carbon dioxide is being combined with ribulose-bisphosphate (RuBP) to produce 3-phosphoglycerate (3PG). Then suddenly the source of carbon dioxide is eliminated. What changes in the concentrations of 3PG and RuBP would occur?

3PG levels rise, RuBP levels fall.

3PG levels fall, RuBP levels rise.

3PG levels rise, RuBP levels rise.

3PG levels fall, RuBP levels fall.

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

Explanation

Elimination of a source of CO₂ would block the action of RUBISCO, which required CO₂ as a subtrate. There would be no further production of 3-phosphoglycerate (3PG).

The remaining reactions of the Clavin Cycle are not block by the absence of CO₂. Intermediates in the cyclic pathway would be converted to ribulose-1,5-bisphosphate (RuBP) and the level of RuBP would rise.

● ● ● ● ●

Crops such as tomatoes and bell pepper, allowed to grow in a carbon dioxide rich environment, show higher yields because:

They show an increased rate of photosynthesis at higher carbon dioxide concentrations

They can respond to high carbon dioxide conditions even in low light conditions.

They show C₄ pathway for cabon fixation at high carbon dioxide is the limiting factor in such plants.

Only carbon dioxide is the limiting factor in such plants

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

Explanation

Read page 223, XI NCERT

● ● ● ● ●

At about what percentage of the full sunlight does light saturation occurs in photosynthesis?

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

Explanation

Read page 222, XI NCERT

● ● ● ● ●

Suppose the interoir of the thylakoids of isolated chloroplasts and then transferred in the dark to a pH 8 solution. What would be likely to happen?

The isolated chloroplasts will make ATP

The Clavin cycle will be activated.

The cyclic photophosphorylation will occur

Isolated chloroplasts will generate oxygen gas

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

Explanation

The proton gradient will lead to chemiosmosis and phosphorylation of ADP into ATP.

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every Botany 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.