NCERT Solution of Class 11 Biology MCQ Important Question Answer solution with pdf. Here We Provides Class 1 to 12 all Subjects NCERT Solution with Notes, Question Answer, CBSE and HBSE Important Questions, MCQ and old Question Papers for Students.
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HBSE ( Haryana Board ) Solution of Class 11th Biology MCQ Important questions with answer Solution.
HBSE Class 11 Biology Important MCQ Question Answer 2025
Class 11 Biology Chapter 1 – The Living World Important MCQ Question Answer 2025
1. The taxonomical unit phylum in the classification of animals is equivalent to which hierarchical level in classification of plants?
(A) Class
(B) Order
(C) Division
(D) Family
Ans – (C) Division
Class 11 Biology Chapter 2 – Biological Classification Important MCQ Question Answer 2025
1. Which of the following lack cell wall?
(A) Mycoplasma
(B) Archacbacteria
(C) Dinoflagellate
(D) Chrysophytes
Ans – (A) Mycoplasma
2. The five kingdom classification was proposed by:
(A) R. H. Whittaker
(B) C. Linnaeus
(C) A. Roxberg
(D) Virchow
Ans – (A) R. H. Whittaker
3. Albugo belongs to:
(A) Ascomycetes
(B) Phycomycetes
(C) Basidiomycetes
(D) Deuteromycetes
Ans – (B) Phycomycetes
Class 11 Biology Chapter 3 – Plant Kingdom Important MCQ Question Answer 2025
1. In which class r-Phycoerythrin is the major pigment ?
(A) Chlorophyceae
(B) Phaeophyceae
(C) Rhodophyceae
(D) None of these
Ans – (C) Rhodophyceae
2. In which class the fucoxanthin is the major pigment?
(A) Chlorophyceae
(B) Phaeophyceae
(C) Rhodophyceae
(D) None of these
Ans – (B) Phaeophyceae
3. Protonema is :
(A) Haploid and is found in mosses
(B) Diploid and is found in pteridophytes.
(C) Diploid and is found in liverworts
(D) Haploid and is found in pteridophytes
Ans – (A) Haploid and is found in mosses
Class 11 Biology Chapter 4 – Animal Kingdom Important MCQ Question Answer 2025
1. The animals of which of the following have closed circulatory system.
(A) Annelida
(B) Arthropoda
(C) Mollusca
(D) None of these
Ans – (A) Annelida
2. In which phylum closed circulatory system is present?
(A) Annelida
(B) Arthropoda
(C) Mollusca
(D) Hemichordata
Ans – (A) Annelida
3. Which of the following is pseudocoelomate?
(A) Porifera
(B) Coelenterata
(C) Platyhelminthes
(D) Aschelminthes
Ans – (D) Aschelminthes
4. Birds and mammals share one of the following characteristics as a common features.
(A) Pigmented skin
(B) Pneumatic bones
(C) Viviparity
(D) Warm blooded
Ans – (D) Warm blooded
5. Segmentation in the body is first observed in which of the following?
(A) Platyhelminthes
(B) Aschelminthes
(C) Annelida
(D) Arthropoda
Ans – (C) Annelida
Class 11 Biology Chapter 5 – Morphology of Flowering Plant Important MCQ Question Answer 2025
1. The ovary of which flowers is superior?
(A) China rose
(B) Mustard
(C) Both (A) & (B)
(D) Cucumber
Ans – (C) Both (A) & (B)
2. Which is having parietal placentation ?
(A) Sunflower
(B) Marigold
(C) Primrose
(D) Argemone
Ans – (D) Argemone
3. Which is having free central placentation?
(A) Dianthus
(B) Mustard
(C) Sunflower
(D) Marigold
Ans – (A) Dianthus
4. Which of the following acts as auditory receptor ?
(A) Crista
(B) Macula
(C) Organ of corti
(D) All of these
Ans – (C) Organ of corti
5. In which of the following ovary is inferior ?
(A) Mustard
(B) Brinjal
(C) China-rose
(D) Guava
Ans – (D) Guava
Parietal placentation is present in:
(A) Tomato
(B) Sunflower
(C) Pea
(D) Mustard
Ans – (D) Mustard
Class 11 Biology Chapter 6 – Anatomy of Flowering Plants Important MCQ Question Answer 2025
1. Which element play important role in opening and closing of stomata ?
(A) Nitrogen
(B) Phosphorus
(C) Potassium
(D) Calcium
Ans – (C) Potassium
2. Companion cells are specialized :
(A) Parenchymatous cells
(B) Collenchyma cell
(C) Sclerenchymatous cells
(D) None of these
Ans – (A) Parenchymatous cells
Class 11 Biology Chapter 7 – Structural Organisation in Animals Important MCQ Question Answer 2025
Class 11 Biology Chapter 8 – Cell : The Unit of Life Important MCQ Question Answer 2025
1. Which cell organelle is surrounded by single membrane ? Most Important
(A) Lysosome
(B) Ribosome
(C) Mitochondria
(D) Nucleus
Ans – (A) Lysosome
2. Phloem fibres are made-up of:
(A) Parenchymatous cells
(B) Collenchymatous cells
(C) Sclerenchymatous cells.
(D) None of these
Ans – (C) Sclerenchymatous cells.
3. Which of the following organelles does not surrounded by any membrane ?
(A) Ribosome
(B) Nucleus
(C) Mitochondria
(D) Endoplasmic reticulum
Ans – (A) Ribosome
Class 11 Biology Chapter 9 – Biomolecules Important MCQ Question Answer 2025
1. Inulin is a polymer of: Most Important
(A) Glucose
(B) Fructose
(C) Galactose
(D) None of these
Ans – (B) Fructose
Class 11 Biology Chapter 10 – Cell Cycle and Cell Division Important MCQ Question Answer 2025
1. In which of the following Synaptonemal complex is formed?
(A) Leptotene
(B) Zygotene
(C) Pachytene
(D) Diakinesis
Ans – (B) Zygotene
2. The stage when chiasmata are seen is :
(A) Zygotene
(B) Pachytene
(C) Diplotene
(D) Diakinesis
Ans – (C) Diplotene
Class 11 Biology Chapter 11 – Photosynthesis in Higher Plants Important MCQ Question Answer 2025
1. In citric acid cycle, which of the following step is not catalysed by dehydrogenase enzyme ?
(A) Oxaloacetic acid to citric acid
(B) Citric acid to a-ketoglutaric acid
(C) Succinic acid to fumaric acid
(D) Malic acid to oxaloacetic acid
Ans – (D) Malic acid to oxaloacetic acid
2. Assertion (A): C4 photosynthetic pathway is more efficient than the C3 pathway.
Reason (R): In C4 plants photorespiration does not occur.
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).
(B) Both Assertion (A) and Reason (R) are true but Reason (R) is not correct explanation of Assertion (A).
(C) Assertion (A) is true but Reason (R) is false.
(D) Both Assertion (A) and Reason (R) are false.
Ans – (A) Both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).
3. PEP is primary CO2 acceptor in:
(A) C2 plants
(B) C3 plants
(C) C4 plants
(D) Both (B) & (C)
Ans – (B) C3 plants
Class 11 Biology Chapter 12 – Respiration in Plants Important MCQ Question Answer 2025
Class 11 Biology Chapter 13 – Plant Growth and Development Important MCQ Question Answer 2025
1. Which element is needed for synthesis of Auxin ?
(A) Manganese
(B) Zinc
(C) Copper
(D) Boron
Ans – (B) Zinc
2. ABA acts as antagonistic to:
(A) Ethylene
(B) Cytokinin
(C) Gibberellic acid
(D) IAA
Ans – (C) Gibberellic acid
3. Ethylene is used for:
(A) Slowing down ripening of Apples
(B) Slowing down ripening of Tomato
(C) Hastening of ripening in Fruits
(D) Both (B) & (C)
Ans – (D) Both (B) & (C)
4. Which of the following auxin has been isolated from plants ?
(A) Naphthalene acetic acid (NAA)
(B) 2, 4-dichlorophenoxy acetic acid (2, 4-D)
(C) Indole acetic acid (IAA)
(D) None of these
Ans – (C) Indole acetic acid (IAA)
Class 11 Biology Chapter 14 – Breathing and Exchange of Gases Important MCQ Question Answer 2025
1. Which of the following is made-up of single layer of cells ?
(A) Squamous epithelium
(B) Cuboidal epithelium
(C) Columnar epithelium
(D) All of these
Ans – (A) Squamous epithelium
2. Oxygen dissociation curve is:
(A) Parabolic
(B) Hyperbolic
(C) Sigmoid
(D) Straight
Ans – (C) Sigmoid
3. One molecule of haemoglobin can carry a maximum of how many molecules of oxygen ?
(A) 2
(B) 4
(C) 6
(D) 8
Ans – (B) 4
Class 11 Biology Chapter 15 – Body Fluids and Circulation Important MCQ Question Answer 2025
1. Which of the following have oxygenated blood?
(A) Vena cava
(B) Pulmonary vein
(C) Right auricle
(D) Right ventricle
Ans – (B) Pulmonary vein
2. Which is responsible for immune responses of the body?
(A) Basophil
(B) Eosinophil
(C) Lymphocytes
(D) Thrombocytes
Ans – (B) Eosinophil
Class 11 Biology Chapter 16 – Excretory Products and their Elimination Important MCQ Question Answer 2025
1. If the external solutions more dilute than the cytoplasm, it is :
(A) Hypotonic
(B) Hypertonic
(C) Isotonic
(D) None of these
Ans – (A) Hypotonic
2. In which of the following solution cell swell?
(A) Hypertonic
(B) Hypotonic
(C) Both (A) & (B)
(D) Isotonic
Ans – (B) Hypotonic
3. Which is uricotelic?
(A) Earthworm
(B) Cockroach
(C) Frog
(D) Human being
Ans – (B) Cockroach
4. Glomerulus along with Bowman’s capsule is called:
(A) Proximal convoluted tubule
(B) Distal convoluted tubule
(C) Henle’s loop
(D) None of these
Ans – (D) None of these
5. Glomerulus along with Bowman’s capsule is called:
(A) Proximal convoluted tubule
(B) Distal convoluted tubule
(C) Henle’s loop
(D) malpighian body or renal corpuscle
Ans – malpighian body or renal corpuscle
6. Renin is released by:
(A) Small Intestine
(B) Large Intestine
(C) Stomach
(D) None of these
Ans – (C) Stomach
Class 11 Biology Chapter 17 – Locomotion and Movement Important MCQ Question Answer 2025
1. Which joint is present between atlas and axis vertebra :
(A) Hinge
(B) Pivot
(C) Gliding
(D) Saddle
Ans – (B) Pivot
2. Gout is caused due to the accumulation of:
(A) Oxalic acid
(B) Uric acid crystals
(C) Lactic acid
(D) Calcium carbonate
Ans – (B) Uric acid crystals
3. Assertion (A): In muscle contraction, length of both A-bands and I-band decreased.
Reason (R): Both myosin of A-band and actin of I-band are contractile proteins and decrease in size during muscle contraction.
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).
(B) Both Assertion (A) and Reason (R) are true but Reason (R) is not correct explanation of Assertion (A).
(C) Assertion (A) is true but Reason (R) is false.
(D) Both Assertion (A) and Reason (R) are false.
Ans – (D) Both Assertion (A) and Reason (R) are false.
Class 11 Biology Chapter 18 – Neural Control and Coordination Important MCQ Question Answer 2025
1. Node of Ranvier is found in:
(A) Non-myelinated nerve fibres
(B) Myelinated nerve fibre
(C) Both (A) and (B)
(D) None of these
Ans – (B) Myelinated nerve fibre
2. Assertion (A): Mitochondria and chloroplast are semi-autonomous organelles.
Reason (R): They are formed by division of pre-existing organelles and contain DNA but lack protein synthesizing machinery.
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).
(B) Both Assertion (A) and Reason (R) are true but Reason (R) is not correct explanation of Assertion (A).
(C) Assertion (A) is true but Reason (R) is false.
(D) Both Assertion (A) and Reason (R) are false.
Ans – (D) Both Assertion (A) and Reason (R) are false.
Class 11 Biology Chapter 19 – Chemical Coordination and Integration Important MCQ Question Answer 2025
1. Which of the following is a glucocorticoid ?
(A) Cortisol
(B) Epinephrine
(C) Nor-epinephrine
(D) Aldosterone
Ans – (A) Cortisol
2. Assertion (A): Vasopressin released by posterior pituitary is also called Anti- diuretic Hormone (ADH).
Reason (R): ADH increases the permeability of (PCT) Proximal Convoluted Tubule and collecting tubules to increase reabsorption of water and decrease the urine output.
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).
(B) Both Assertion (A) and Reason (R) are true but Reason (R) is not correct explanation of Assertion (A).
(C) Assertion (A) is true but Reason (R) is false.
(D) Both Assertion (A) and Reason (R) are false.
Ans – (A) Both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).