Biology 11 past paper 2022

The **DNA** is present in:

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Narrate the role of **Peroxisomes** and **Glyoxisomes** in plant cells.

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Describe the steps which lead to the evolution of seed in seeded plants.

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The organelle which will be more active in **liver cells** after alcohol intake is:

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Compare **Autophagy** and **Autolysis**.

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Describe **Life Cycle of a Fern**. Also sketch and label the life cycle.

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Which one of the following is **mismatched**?

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Describe three types of Cofactors with one example of each.

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**Liver** is an Accessory Gland. Describe its **Storage** and **Metabolic** roles.

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The property of water which helps to maintain integrity of lipid bilayer is:

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Elaborate the structure of **Cilia** and **Flagella**. How does Cilia help in movement?

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Describe **Mutualism** established in **Mycorrhizae** and **Lichen Association**.

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The technique used to separate fragments of charge bearing polymers is:

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**Starch** is a homopolysaccharide. (a) How can presence of starch be confirmed in a given sample? (b) Differentiate between its types.

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Describe **General Characteristics of Mammals**. Also name subgroups of Mammals.

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β 1-4 **Glycosidic linkage** is found in:

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What are **Stereoisomers**? Why are laboratory-manufactured sweeteners not metabolized in the body?

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Write General Characteristics of Phylum Arthropoda.

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Complete the table regarding **Properties of Water**: | Sr. No. | Property of water | Benefit to life | | :--- | :--- | :--- | | I | High polarity | | | II | | As transport medium…

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Explain the main features of Watson and Crick model of DNA.

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The causative agent of **Hepatitis D** is:

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Justify the significance of sequence of amino acids in Normal and Sickle Cell Haemoglobin.

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How is blood flow through the heart regulated by valves?

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Which of the following is **NOT** an electron acceptor during photophosphorylation?

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List any three groups of enzymes on the basis of Types of Reactions with one respective enzyme example.

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How do the **SA node**, **AV node** and **Purkinje Fibers** play a role in conducting a heartbeat in the human heart?

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The physical method used to control Bacteria is:

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What are **Prostaglandins**? Mention their role in living organisms.

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In **Systemic circulation**, write about circulation of blood to heart, liver and kidneys.

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Write any three **Plasma Membrane Proteins** with their respective functions.

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Explain **Mechanism of movement of Sugars** in plant body. Illustrate with a labelled diagram.

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The products formed during **light dependent reactions** are:

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Narrate the mechanism of **Induced Fit Model** of enzyme working.

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Explain the structure of a villus. How is its structure well-suited for the absorption of different digested food such as glucose, amino acids and fats?

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*Agaricus* belongs to:

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Draw **Z-scheme** for explaining the events of light dependent reactions of photosynthesis.

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A sequence of three nucleotides called **anticodon** is part of:

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Outline the steps of Krebs cycle with labelling.

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How does K⁺ ions influx and efflux control opening and closing of stomata?

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What is **Absorption Spectrum**? How do Absorption Spectrum of $Chl\ a$, $b$ and carotenoids differ?

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Identify the type of immunity produced after using **vaccine**:

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a) List the events of Photorespiration. b) How is Photorespiration disadvantageous?

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**Allergic response** is produced due to production of:

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Write down steps of **Lytic cycle** in Bacteriophage.

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Compare characteristics of **virus** as non-living and living organism.

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Complete the table regarding **Diseases**: | Sr. No. | Disease | Causative agent | Symptoms | Prevention | | :--- | :--- | :---: | :---: | :---: | | I | [Peptic ulcer/Gastric ulcer…

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Presence of fats in intestine causes release of bile under the influence of:

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Why **Archaea** are regarded as **Extremophiles**? Elaborate answer with examples.

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**Secondary xylem** is produced by the activity of:

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Complete the table regarding **Gram positive** and **Gram negative** bacteria for the following characters: I) Thickness, II) Peptidoglycan, III) Periplasmic space.

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An organism with **Chlorophyll a**, **phycobilins** and **heterocyst** is:

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Presence of shelled egg, dry skin and internal fertilization are evolutionary adaptations in:

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Differentiate photosynthesis in Cyanobacteria and Bacteria.

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In human stomach **$HCl$** is secreted by:

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Which cells produce **Antibody Mediated Response** and how?

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All of the following are characteristics of **Chondrichthyes** EXCEPT:

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List and elaborate any six salient features of Protozoa.

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The causative agent of **Cotton Leaf Curl Disease** is:

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Relate the evolutionary adaptations in **Digestion**, **Respiration** and **Nervous System** of **Echinoderms**.

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The arrangement of **flagella** in the bacterial cell shown in the diagram is:

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Write about cause, prevention and treatment of **Dyspepsia**.

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Which one of the following characteristics is **NOT** related to Algae?

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Elaborate major roles performed by **large intestine** in humans.

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**Cyclosis**, the movement of cytoplasm, is controlled by:

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Differentiate between **Protostomes** and **Deuterostomes**.

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The thickest layer of the left ventricle of human heart is:

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Draw and label the life cycle of a slime mold.

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In bacterial cell the absorption of DNA from medium to cell results in:

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Write about the structure of a typical antibody.

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The transfer of antibodies from one individual to another individual is a type of:

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**Fungi** are neither placed in Plantae nor in Animalia but in a separate kingdom Fungi. Justify.

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List the adaptations in **Xerophytes** which enable them to live in that specific environment.

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Classify plants on the basis of **Photoperiod** with one example of each group.

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**Inflammatory response** is a type of Non-Specific Defence. State its events.

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What is **Transduction** and how it occurs in bacteria?

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Write down the principle of Angioplasty.

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If a cell is infected by microbes, how will natural killer cells act?

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What are **Irreversible Non-Competitive Inhibitors**? Describe with examples.

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