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Biology 11 Past Paper 2025 | Notely

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All Biology 11 papers

Class 11 · Past paper

Biology 11 past paper 2025

48 published questions in this index. The full practice view lets you work through them and track your own attempts.

13 MCQs35 written questionsPractise this paper

Question index

1
In tRNA molecule, the main function of **middle loop** is to:
MCQ1 marksannual
1
How does the **Golgi complex** play a role in cell secretion and cell division?
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1
Explain the steps of life cycle of Human Immunodeficiency Virus (HIV). Also draw its life cycle.
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2
**Prostaglandins** are derivatives of:

This is a skimmable index, not a replacement for the study surface. Open the practice view to answer questions and use the linked study material.

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2

Compare the characteristics of **Cofactors** of enzymes with one example of each.

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2

Explain different stages of xerarch succession on bare rock starting from lichens to flowering plants.

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3

Write any three main features of **Bryophytes**.

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3

Explain **translation process** starting from initiation complex till termination. Also draw diagram of initiation complex and elongation steps.

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4

Enlist any three physical methods used to control bacteria with their mechanisms.

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4

How electrons move through **electron transport chain** till they reach final acceptor? Explain. Draw diagram of electron transport chain.

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5

Which enzymes break specific **covalent bonds** without hydrolysis?

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5

Justify the statement "Water is a universal solvent".

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5

Describe the pathways involved in moving signals from outside to inside the cell with their diagrams.

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6

**Viroids** cause:

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6

**Endospore formation** is a mechanism in bacteria to survive under unfavorable conditions. Justify.

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6

Elaborate the structures and roles of **steroids** and **prostaglandins** as important group of lipids.

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7

The type of flagella arrangement shown in the bacteria is: [image/diagram reference needed]

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7

List the **Accessory glands** associated with male reproductive system with their respective locations.

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7

Explain the mechanism of photoperiodism.

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8

Genetic material moves from donor to recipient bacterium in:

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8

What is **incomplete dominance**? Explain with a suitable example.

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8

Write three distinguishing characteristics and one example of each of the phylum **Cnidaria**, **Arthropoda** and **Mollusca**.

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9

Mutualistic fungi which grow between root cells of plants and do not penetrate cells is:

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9

Why and how does cyclic photophosphorylation occur in light reactions?

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10

Growth movements shown by climbing plants with a supporting structure is:

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10

Write steps of **lytic cycle** in bacteriophage.

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11

What is **mycorrhiza**? Differentiate between its types.

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12

Radial symmetry and water vascular system are found in phylum:

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12

What is **point mutation**? How does it cause sickle cell anaemia?

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13

Uterine lining in female starts breaking due to less concentration of:

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13

Compare **apoplast** and **symplast** pathways involved in uptake of water by roots in plants.

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14

A forest was completely destroyed by fire. After about hundred years, a new forest evolved. The type of **succession** shown is:

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14

**Molecular biology** provides evidence of evolution. Justify the statement with reference to any three examples.

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15

Write about **de-nitrification** and **assimilation** processes in nitrogen cycle.

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16

In TS of a dicot stem, which substances are expected to pass through labelled parts **P** and **Q** respectively?

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16

Write about the structure and functions of **ovary** and **oviduct** in female reproductive system.

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17

The structures which help bacteria to survive under unfavorable conditions include:

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17

What is **Y-linked inheritance**? How are these traits transmitted? Also give two examples.

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18

Name and briefly explain **Growth Phases** of bacteria. (Any three)

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19

Complete the table with reference to enzymes: - **a.** Break large molecules with water - **b.** Lyases - **c.** Cytochrome oxidase [Table structure not provided in stem]

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20

Coat color in Labrador retriever shows **epistasis**. If a black ($BbEe$) and a chocolate ($bbEe$) Labrador retrievers are crossed: a. Show genotypes and phenotypes of offspring(s)…

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21

Illustrate the conversion of pyruvic acid to acetyl CoA as link reaction between glycolysis and Krebs cycle.

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23

Write difference in flower, stem and seed of **dicots** and **monocots**.

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24

Name any three enzymes with their functions involved in DNA replication.

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25

Elaborate the **endosymbiont theory** regarding evolution of chloroplast and mitochondria.

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26

How is **maltose** different from **sucrose** in glycosidic linkage, monosaccharide units and specific role?

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27

What are the limitations of Lamarckism?

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28

Write characteristics of **angiosperms** with reference to vascular tissues and alternation of generation.

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