11th Botany Important Three Mark Questions 2025

📖 11th Botany Important Two Mark Questions 2025

📚 Score High with 11th Botany 2-Mark Questions!
This 11th Botany Two Marks Important Questions Guide is specially designed for Tamil Nadu 11th Public Exam 2025 students. It contains chapter-wise two-mark questions, carefully selected from previous year question papers, model exams, and textbook exercises. These frequently asked 2-mark questions help students cover essential concepts and definitions in a short and precise manner.

✔ Based on Tamil Nadu 11th Board Exam Syllabus
✔ Chapter-wise 2-Mark Questions with Answers
✔ Covers Definitions, Functions & Key Concepts
✔ Includes Previous Year Public Exam Questions

Most Important Three Marks

Draw and label the parts

• Draw and label the parts of the regions of the root.Ch3 – 3 times
• Draw and label stomata.Ch9 – 2 times
• Draw and label the parts of ‘regions of root’.Ch3
• Draw and label the structure of a Chromosome.Ch6
• Draw and label the parts of the ultrastructure of a plant cell.Ch6
• Draw and label the structure of Cycas rachis.Ch2
• Draw and label the diagram to show the different types of meristem based on their position in the plant body.Ch9
• Draw the structure of the nucleus with parts.Ch6

Most Repeated Three Marks

• Differentiate between aggregate fruit and multiple fruit. Ch4 – 3 times
• Write any three importances of Mycorrhizae.Ch1 – 3 times
• What is Amber? Which group of plants produces Amber?Ch2 – 3 times
• Write the properties of water.Ch8 – 2 times
• Give an account of the G₀ phase.Ch7 – 2 times
• Differentiate nodal and internodal cells of Chara.Ch2 – 2 times
• Differentiate between Sapwood and Heartwood.Ch10. – 2 times
• What is Plasmolysis?Ch11 – 2 times
• What is Tyloses?ch10 – 2 times
• What are sieve tube cells?Ch9 – 2 times
• List the functions of the nucleus. – 2 times
• Write any three physiological effects of Cytokinins.Ch15 – 2 times
• Differentiate between mitosis and meiosis.Ch7 – 2 times
• Write about the significance of mitosis.Ch7 – 2 times
• Write any three significances of mitosis.Ch7 – 2 times
• Define Archaebacterium. Give an example.Ch1 – 2 times
• Classify the lichens based on morphology.Ch1 – 2 times
• Write the properties of enzymes.Ch8 – 2 times

Chapter wise Important Three Marks

Chapter 1: Diversity of Living World

1. Name the types of Mycelium found in Agaricus. (Ch1)
2. Write the Gram’s staining procedure. (Ch1)
3. Give a short note on Coenocytic mycelium. (Ch1)
4. Write the types of mycelium present in Agaricus. (Ch1)
5. Give a general account of lichens. (Ch1)

Chapter 2: Kingdom Plantae

1. Do you think the shape of the chloroplast is unique for algae? Justify your answer. (Ch2)
2. Define alternation of generation. (Ch2)
3. Differentiate between gymnosperm and angiosperm. (Ch2)
4. What are mitotic inhibitors? Give an example. (Ch2)
5. List out the classes of algae. (Ch2)
6. Describe the haplontic life cycle. (Ch2)
7. What is coralloid root? Give an example. (Ch2)

Chapter 3: Morphology of Flowering Plants

1. Write short notes on breathing roots. (Ch3)
2. Explain about phylloclade. (Ch3)
3. Differentiate pinnate unicostate venation from palmate multicostate venation. (Ch3)
4. What is Runner? Give an example. (Ch3)

Chapter 5: Taxonomy of Angiosperms

1. Artificial system of classification is also known as the sexual system of classification. Why? (Ch5)
2. What is binomial nomenclature? Give an example? (Ch5)
3. Differentiate taxonomy and systematics. (Ch5)
4. Write any three uses of Herbarium. (Ch5)

Chapter 6: Cell Biology

1. State the protoplasm theory. (Ch6)
2. Write the functions of the cell wall. (Ch6)

Chapter 8: Biomolecules

1. Write functions and deficiency symptoms of any two macronutrients. (Ch8)
2. Write about the Lock and Key mechanism of Enzymes. (Ch8)
3. What is a steroid? Give an example. (Ch8)

Chapter 9: Anatomy of Flowering Plants

1. What is Protoxylem lacuna? (Ch9)
2. Write any three functions of the Epidermal tissue system. (Ch9)
3. Write the types of parenchyma. (Ch9)

Chapter 10: Secondary Growth

1. Differentiate between spring wood and autumn wood. (Ch10)

Chapter 11: Transport in Plants

1. How does phosphorylase enzyme open the stomata in starch-sugar interconversion theory? (Ch11)
2. What is transpiration? Write its types. (Ch11)

Chapter 12: Mineral Nutrition

1. What are Unclassified minerals? Give examples? (Ch12)
2. Nitrogen is present in the atmosphere in huge amounts, but higher plants fail to utilize it. Why? (Ch12)

Chapter 13: Photosynthesis

1. What are dimorphic chloroplasts? In which group of plants are these found? (Ch13)
2. Differentiate between cyclic and non-cyclic photophosphorylation. (Ch13)

Chapter 14: Respiration and Metabolism

1. Give any three significances of the pentose phosphate pathway. (Ch14)
2. Why is the Krebs cycle called an amphibolic pathway? (Ch14)

Chapter 15: Growth and Development

1. Write the significance of abscission. (Ch15)
2. Write any three physiological effects of auxin. (Ch15)
3. What is senescence? Write their types. (Ch15)