NCERT Solution of Class 11 Biology 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 Important questions with answer Solution.
HBSE Class 11 Biology Important Question Answer for 2024
Class 11 Biology Chapter 1 – The Living World Important Questions 2024
Q1. From which Latin word ‘systematic is derived?
Ans – systema
Q2. Write down the taxonomic categories of housefly.
Ans – Taxonomic category of housefly –
- Biological name – Musca domestica
- Genus – Musca
- Family – Muscidae
- Order – Diptera
- Class – Insecta
- Division – Arthropoda
Q3. Explain classification of Wheat.
Class 11 Biology Chapter 2 – Biological Classification Important Questions 2024
Q1. What is lichen ?
Ans – Lichens are symbiotic associations i.e. mutually useful associations, between algae and fungi.
Q2. What are heterocysts ?
Ans – Some organisms can fix atmospheric nitrogen in specialised cells called heterocysts, e.g., Nostoc and Anabaena.
Q3. Name the organism responsible for red tide in sea.
Ans – Gonyaulax
Q4. Which scientist proposed five kingdom classification ?
Ans – R.H. Whittaker (1969)
Q5. What is diatomaceous earth? Write its importance.
Q6. How are viroids different from viruses?
Q7. What are the benefits of Diatoms?
Q8. Which are the various classes of Pteridophytes ?
Q9. Explain Plasmogamy and Karyogamy.
Ans –
- Fusion of protoplasms between two motile or non-motile gametes called plasmogamy.
- Fusion of two nuclei called karyogamy.
Class 11 Biology Chapter 3 – Plant Kingdom Important Questions 2024
Q1. What is the name of red pigment found in members of Rhodophyceae ?
Ans – r-phycoerythrin
Q2. Write the name of any two unicellular algae which are used as food supplements even by space travellers.
Ans – Chlorella, Spirulina
Q3. Name two algae from which Agar is obtained.
Ans – Gelidium and Gracilaria
Q4. Describe important characteristics of mosses.
Q5. What is Heterospory? Briefly comment on its significance.
Class 11 Biology Chapter 4 – Animal Kingdom Important Questions 2024
Q1. Write down the name of an oviparous mammal.
Ans – Bufo (Toad), Rana (Frog), Hyla (Tree frog)
Q2. What is coelom?
Ans – The body cavity, which is lined by mesoderm is called coelom.
Q3. Write down the scientific name of a limbless amphibian.
Ans – Ichthyophis
Q4. Write down the salient features of Non- chordates.
Q5. What steps are involved in respiration in human beings?
Q6. What are the characteristics of phylum Echinodermata ?
Q7. Write down the characters of phylum porifera.
Q8. Write down the important characters of class Chondrichthyes.
Q9. What is the role of Radula in Molluscs?
Q10. Give three differences between Chordates and Non-chordates.
Class 11 Biology Chapter 5 – Morphology of Flowering Plant Important Questions 2024
Q1. Write down the floral formula of Solanaceae family.
Q2. What is phyllotaxy? Most Important
Ans – Phyllotaxy is the pattern of arrangement of leaves on the stem or branch. This is usually
of three types – alternate, opposite and whorled.
Q3. What is zygomorphic flower?
OR
What is an actinomorphic flower?
Ans – the flower may be actinomorphic (radial symmetry) or zygomorphic (bilateral symmetry). When a flower can be divided into two equal radial halves in any radial plane passing through the centre, it is said to be actinomorphic, e.g., mustard, datura, chilli
Q4. What is perigynous flower?
Ans – If gynoecium is situated in the centre and other parts of the flower are located on the rim of the thalamus almost at the same level, it is called perigynous. The ovary here is said to be half
inferior, e.g., plum, rose, peach.
Q5. What are hypogynous flowers?
Ans – In the hypogynous flower the gynoecium occupies the highest position while the other parts are situated below it. The ovary in such flowers is said to be superior, e.g., mustard, china rose and brinjal.
Q6. What is Venation?
Ans – The arrangement of veins and the veinlets in the lamina of leaf is termed as venation.
Q7. What is aestivation?
Ans – The mode of arrangement of sepals or petals in floral bud with respect to the other members of the same whorl is known as aestivation.
Q8. What do you mean by Cohesion and Adhesion ?
Q9. How is a pinnately compound leaf different from a palmately compound leaf?
Ans – In a pinnately compound leaf a number of leaflets are present on a common axis, the rachis, which represents the midrib of the leaf as in neem. In palmately compound leaves, the leaflets are attached at a common point, i.e., at the tip of petiole, as in silk cotton.
Q10. Describe modifications of stem with suitable examples.
Q11. Explain Phyllotaxy and its types.
Class 11 Biology Chapter 6 – Anatomy of Flowering Plants Important Questions 2024
Q1. What is Pith?
Q2. What are bulliform cells ?
Ans – In grasses, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells.
Q3. What are trichomes ? Write their functions.
Ans – The cells of epidermis bear a number of hairs. The root hairs are unicellular elongations of the epidermal cells and help absorb water and minerals from the soil. On the stem the epidermal hairs are called trichomes.
Functions –
- The trichomes in the shoot system are usually multicellular.
- They may be branched or unbranched and soft or stiff.
- They may even be secretory.
- The trichomes help in preventing water loss due to transpiration.
Q4. What is transpiration? Which external factors affect transpiration.
Q5. Draw a well labelled diagram of T. S. dicot root (Primary). Most Important
Ans –
Class 11 Biology Chapter 7 – Structural Organisation in Animals Important Questions 2024
Q1. Describe the process of digestion of food in stomach.
Class 11 Biology Chapter 8 – Cell : The Unit of Life Important Questions 2024
Q1. What is a polysome ?
Ans – Several ribosomes may attach to a single mRNA and form a chain called polyribosomes or polysome. The ribosomes of a polysome translate the mRNA into proteins.
Q2. What are telocentric chromosomes ?
Ans – Those chromosomes which has a terminal centromere is called telocentric chromosomes.
Q3. What is the unit of sedimentation coefficient?
Ans – ‘S’ (Svedberg’s Unit)
Q4. What are the functions of Golgi apparatus ?
Ans –
- The golgi apparatus principally performs the function of packaging materials, to be delivered either to the intra-cellular targets or secreted outside the cell.
- A number of proteins synthesised by ribosomes on the endoplasmic reticulum are modified
in the cisternae of the golgi apparatus before they are released from its trans face. - Golgi apparatus is the important site of formation of glycoproteins and glycolipids.
Q5. What are Leucoplasts ? Write about its various types.
Q6. What are various types of Ieucoplasts ? Write their functions.
Q7. Classify various types of chromosome on the basis of position of centromere.
Q8. Why the Golgi apparatus remains in close association with the Endoplasmic reticulum ? Explain.
Q9. What are the characteristics of Eukaryotic cells ?
Q10. What is Tonoplast?
Q11. Explain Prokaryotic and Eukaryotic cell.
Q12. Differentiate between Plant Cell and Animal Cell.
Q13. Explain Fluid-Mosaic Model of plasma membrane.
Class 11 Biology Chapter 9 – Biomolecules Important Questions 2024
Q1. Which is the most abundant protein in the whole of the biosphere ?
Ans – Ribulose bisphosphate Carboxylase-Oxygenase (RuBisCO)
Q2. Which is the most abundant protein in animal world?
Ans – Collagen
Q3. The individual monosaccharides are linked by which bond in a polysaccharide ?
Q4. What are the building blocks of nucleic acid ?
Ans – Nucleotide
Q5. What is apoenzyme?
Ans – The protein portion of the enzymes is called the apoenzyme
Q6. What are Competitive inhibitors ?
Ans – The inhibitor competes with the substrate for the substrate binding site of the enzyme are called competitive inhibitors.
Q7. Which is the cofactor for enzyme carboxypeptidase?
Ans – Zinc
Q8. What are Primary and Secondary metabolites ? Most Important
Ans – In animal tissues, one notices the presence of all such categories of compounds. These are called primary metabolites. However, when one analyses plant, fungal and microbial cells, one would see thousands of compounds other than these called primary metabolites. e.g. alkaloids, flavonoids, rubber, essential oils, antibiotics, coloured pigments, scents, gums, spices. These are called secondary metabolites.
Q9. Describe the various steps of catalytic cycle of an Enzyme action.
Q10. Describe the structure of proteins at various levels.
Q11. The primary structure of protein has……. ends.
Class 11 Biology Chapter 10 – Cell Cycle and Cell Division Important Questions 2024
Q1. What is a synapse?
Ans – A synapse is a small gap at the end of a neuron that allows a signal to pass from one neuron to the next.
Q2. At which stage of cell cycle chromosomes are moved to spindle equator?
Ans – Metaphase (2nd Stage)
Q3. In which stage of cell cycle centromere splits & chromatid separates?
Ans – Prophase (1st Stage)
Q4. What does happen in Interphase?
Ans – The interphase, though called the resting phase, is the time during which the cell is preparing for division by undergoing both cell growth and DNA replication in an orderly manner.
Q5. Why is mitosis called equational division ? Most Important
Ans – Mitosis is called equational division because each of the two daughter cells formed, get the same number of chromosomes as the parent.
Q6. Write down the key features of metaphase of mitosis.
Q7. What is the significance of Meiosis?
Q8. In which phase of cell cycle synapsis take place?
Class 11 Biology Chapter 11 – Photosynthesis in Higher Plants Important Questions 2024
Q1. What is photo-phosphorylation ?
Ans – Photo-phosphorylation is the synthesis of ATP from ADP and inorganic phosphate in the presence of light.
Q2. Describe light reaction of photosynthesis.
Q3. Describe Calvin cycle.
Q4. Describe Hatch and Slack Pathway.
Q5. Differentiate between C3 and C4 plants.
Class 11 Biology Chapter 12 – Respiration in Plants Important Questions 2024
Q1. What is the value of RQ for protein ?
Q2. What are lenticels? What is their function and where does they occur?
Q3. Describe various steps of Glycolysis.
Q4. Describe TCA (Tri Carboxylic Acid) cycle.
Q5. Explain Glycolysis.
Class 11 Biology Chapter 13 – Plant Growth and Development Important Questions 2024
Q1. Why Abscisic acid is called stress hormone?
Ans – Abscisic Acid (ABA) stimulates the closure of stomata and increases the tolerance of plants to various kinds of stresses. Therefore, it is also called the stress hormone
Q2. Define Growth.
Ans – Growth can be defined as an irreversible permanent increase in size of an organ or its parts or
even of an individual cell.
Q3. What is intercalary meristem.
Ans – In plants, meristems are the sites of growth. Root and shoot apical meristems sometimes along with intercalary meristem, contribute to the elongation growth of plant axes.
Q4. What are the various physiological responses of Gibberellins in plants? Most Important
Q5. What are the functions of calcium in plants?
Q6. Describe vernalisation. Most Important
Class 11 Biology Chapter 14 – Breathing and Exchange of Gases Important Questions 2024
Q1. What is inspiratory reserve volume?
Ans – Additional volume of air, a person can inspire by a forcible inspiration. This averages 2500
mL to 3000 mL. This is called inspiratory reserve volume.
Q2. Define functional residual capacity of Lungs.
Ans – Volume of air that will remain in the lungs after a normal expiration is defined as functional residual capacity of Lungs.
Q3. Define vital capacity of lungs.
Ans – The maximum volume of air a person can breathe in after a forced expiration or the maximum volume of air a person can breathe out after a forced inspiration is defined as Vital capacity of lungs.
Q4. What are the factors affecting the rate of diffusion ?
Q5. What is Residual Volume?
Class 11 Biology Chapter 15 – Body Fluids and Circulation Important Questions 2024
Q1. What are the functions of plasma proteins ?
Q2. What is hepatic portal system ? Write down its role.
Q3. Describe the mechanism of coagulation of blood.
Q4. Explain the different segments of standard ECG with the help of diagrammatic presentation of a standard ECG.
Q5. Describe events in Cardiac Cycle. Explain double circulation.
Class 11 Biology Chapter 16 – Excretory Products and their Elimination Important Questions 2024
Q1. Describe various types of nephridia of earthworm.
Q2. Discuss the role of lungs, liver and skin in excretion.
Q3. Draw a labelled diagram of human nephron.
Class 11 Biology Chapter 17 – Locomotion and Movement Important Questions 2024
Q1. Differentiate between bone & cartilage.
Q2. Write various types of synovial joints. Where are these present?
Q3. Explain Sliding Filament Theory of Muscle Contraction with neat sketch.
Class 11 Biology Chapter 18 – Neural Control and Coordination Important Questions 2024
Q1. What is passive and active transport?
Q2. Give an account of mechanism of vision.
Q3. Describe the structure of Forebrain.
Q4. Differentiate between Cerebrum and Cerebellum.
Class 11 Biology Chapter 19 – Chemical Coordination and Integration Important Questions 2024
Q1. Write the name of hormone secreted by pineal gland.
Ans – melatonin
Q2. Which is hypercalcemic hormone?
Ans – Parathyroid hormone (PTH)
Q3. Which are the cells present in gastric gland? What is sccreted by them?
Q4. What are the functions of melatonin hormone?
Q5. Where is thymus gland located? Which hormone is secreted by it and what are its functions ?
Q6. Describe process of formation of a root nodule.
Q7. Distinguish between Adipose and Blood Tissue.
Q8. Give two symptoms of Graves’ disease.