Class 11 Biology Practice Questions

Q1. Which organelle is known as the powerhouse of the cell? 🧬

1. Ribosome
2. Golgi apparatus
3. Mitochondria
4. Nucleus

Q2. Which biomolecule is the main source of energy for living organisms? 🧬

1. Nucleic acids
2. Proteins
3. Lipids
4. Carbohydrates

Q3. Cell theory was proposed by: 🧬

1. Darwin and Wallace
2. Schleiden and Schwann
3. Mendel and Morgan
4. Watson and Crick

Q4. Photosynthesis takes place in which organelle? 🧬

1. Mitochondria
2. Chloroplast
3. Nucleus
4. Endoplasmic reticulum

Q5. Which of the following is a plant hormone that promotes cell elongation? 🧬

1. Ethylene
2. Auxin
3. Cytokinin
4. Abscisic acid

Q6. Which macromolecule carries genetic information? 🧬

1. DNA
2. Lipid
3. Carbohydrate
4. Protein

Q7. The process by which plants lose water through their leaves is called: 🧬

1. Photosynthesis
2. Transpiration
3. Respiration
4. Osmosis

Q8. Which type of cell lacks a true nucleus? 🧬

1. Eukaryotic cell
2. Prokaryotic cell
3. Animal cell
4. Plant cell

Q9. The functional unit of kidney is called: 🧬

1. Alveolus
2. Nephron
3. Neuron
4. Villus

Q10. Which pigment is responsible for the green colour of plants? 🧬

1. Xanthophyll
2. Anthocyanin
3. Carotenoid
4. Chlorophyll

Q11. Which organelle is called the powerhouse of the cell?

1. Mitochondria
2. Nucleus
3. Ribosome
4. Chloroplast

Q12. Which organelle controls all cell activities and contains DNA?

1. Mitochondria
2. Nucleus
3. Ribosome
4. Vacuole

Q13. In which organelle does photosynthesis take place?

1. Mitochondria
2. Nucleus
3. Chloroplast
4. Ribosome

Q14. What is the basic structural and functional unit of life?

1. Tissue
2. Organ
3. Molecule
4. Cell

Q15. Which green pigment in plants captures light energy?

1. Chlorophyll
2. Haemoglobin
3. Melanin
4. Carotene

Q16. Which plant tissue transports water from roots to leaves?

1. Phloem
2. Xylem
3. Cortex
4. Epidermis

Q17. How many chambers does the human heart have?

1. 2
2. 3
3. 4
4. 5