1 Which of these is a specialized plant cell that controls gas exchange? A Mesophyll cell B Guard cell C Root hair cell D Epidermal cell
2 What is the role of the nucleolus? A To store DNA B To produce ribosomes C To control cell division D To synthesize lipids
3 What are lysosomes known as? A Powerhouse of the cell B Suicide bags of the cell C Protein factories D Control center
5 Which of the following is found in plant cell walls but not in fungal cell walls? A Chitin B Peptidoglycan C Cellulose D Lignin
6 Which organelle is responsible for modifying, sorting, and packaging proteins? A Endoplasmic reticulum B Golgi apparatus C Lysosome D Vacuole
7 Which of the following is NOT found in an animal cell? A Cell membrane B Mitochondria C Chloroplast D Nucleus
8 Which of the following correctly describes a cell? A The largest unit of life B The basic structural and functional unit of life C A type of tissue D An organ system
9 Which part of the plant cell is made of cellulose? A Cell membrane B Cell wall C Chloroplast D Nucleus
10 Which structure controls what enters and leaves the cell? A Cell wall B Cell membrane C Cytoplasm D Nucleus
11 What are stem cells that can become any type of cell called? A Unipotent B Multipotent C Pluripotent D Totipotent
12 Which of the following is a characteristic of stem cells? A They are fully differentiated. B They cannot divide. C They can differentiate into various cell types. D They are only found in plants.
13 The division of labour among organelles means that: A Each organelle performs all functions. B Different organelles have specific roles. C Organelles work independently without coordination. D Only the nucleus performs all functions.
14 Which type of endoplasmic reticulum is involved in lipid synthesis? A Rough ER B Smooth ER C Both rough and smooth ER D Neither rough nor smooth ER
15 The movement of water across a selectively permeable membrane is called: A Diffusion B Osmosis C Active transport D Phagocytosis
16 Which structure is made of microtubules and helps in cell division? A Centriole B Cilium C Flagellum D Ribosome
17 Which cytoskeletal element is the thinnest? A Microtubules B Microfilaments C Intermediate filaments D Cilia
18 The site of photosynthesis in plant cells is the: A Mitochondrion B Chloroplast C Ribosome D Nucleus
19 Which organelle contains digestive enzymes and breaks down waste materials? A Lysosome B Ribosome C Chloroplast D Vacuole
20 Which organelle is involved in the breakdown of fatty acids and detoxification? A Smooth ER B Rough ER C Lysosome D Peroxisome
21 Which type of plastid gives colour to flowers and fruits? A Chloroplast B Leucoplast C Chromoplast D Ribosome
22 What is the jelly-like substance inside the nucleus called? A Cytosol B Nucleoplasm C Matrix D Stroma
23 Which organelle is known as the powerhouse of the cell? A Nucleus B Mitochondrion C Ribosome D Golgi apparatus
24 Which organelle is responsible for producing proteins in a cell? A Mitochondria B Ribosomes C Golgi apparatus D Lysosomes
25 What is the main function of the large central vacuole in a plant cell? A To produce energy through cellular respiration B To store water and maintain turgor pressure C To synthesize lipids and detoxify substances D To package and modify proteins