1. What is the basic unit of life?
a) Atom
b) Cell
c) Tissue
d) Organ
2. Which organelle is known as the powerhouse of the cell?
a) Nucleus
b) Ribosome
c) Mitochondria
d) Chloroplast
3. Which part of the cell controls its activities?
a) Nucleus
b) Cytoplasm
c) Cell wall
d) Vacuole
4. Where does protein synthesis occur?
a) Nucleus
b) Ribosomes
c) Mitochondria
d) Golgi body
5. Which organelle is responsible for photosynthesis?
a) Mitochondria
b) Ribosomes
c) Chloroplast
d) Lysosome
6. What structure is found in plant cells but not in animal cells?
a) Nucleus
b) Cell wall
c) Mitochondria
d) Cytoplasm
7. Which part of the cell is jelly-like and holds organelles?
a) Nucleus
b) Cytoplasm
c) Cell wall
d) Membrane
8. What is the function of the cell membrane?
a) Support
b) Energy production
c) Transport control
d) Digestion
9. Which organelle packages proteins?
a) Golgi body
b) Ribosomes
c) Nucleus
d) Lysosome
10. Which cell structure helps in cell division?
a) Mitochondria
b) Centrioles
c) Vacuole
d) Chloroplast
11. Photosynthesis takes place in which organelle?
a) Mitochondria
b) Chloroplast
c) Nucleus
d) Ribosome
12. What gas is taken in during photosynthesis?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
13. What gas is released during photosynthesis?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Methane
14. What is the main pigment in photosynthesis?
a) Hemoglobin
b) Chlorophyll
c) Melanin
d) Keratin
15. Which substance is produced by photosynthesis?
a) Protein
b) Fat
c) Glucose
d) DNA
16. What part of the eye controls the amount of light entering?
a) Lens
b) Retina
c) Iris
d) Cornea
17. Which part of the eye is responsible for focusing light?
a) Cornea
b) Retina
c) Iris
d) Lens
18. Where are images formed in the eye?
a) Lens
b) Iris
c) Retina
d) Cornea
19. Which part protects the front of the eye?
a) Iris
b) Cornea
c) Retina
d) Pupil
20. What is the colored part of the eye?
a) Cornea
b) Retina
c) Iris
d) Lens
21. Which element is essential for chlorophyll formation?
a) Calcium
b) Nitrogen
c) Iron
d) Zinc
22. Which mineral helps in root development?
a) Phosphorus
b) Potassium
c) Iron
d) Magnesium
23. What is a symptom of nitrogen deficiency in plants?
a) Yellow leaves
b) Wilting
c) Brown spots
d) Thick stems
24. What do plants absorb through their roots?
a) Carbon dioxide
b) Oxygen
c) Minerals and water
d) Glucose
25. What is the function of stomata?
a) Absorb water
b) Photosynthesis
c) Gas exchange
d) Transport food
26. Which is a carbohydrate?
a) Glucose
b) DNA
c) Insulin
d) Hemoglobin
27. Which is a protein?
a) Cellulose
b) Fructose
c) Insulin
d) Glycerol
28. What are the building blocks of proteins?
a) Sugars
b) Fatty acids
c) Amino acids
d) Nucleotides
29. Which molecule stores genetic information?
a) RNA
b) ATP
c) DNA
d) Protein
30. Lipids are made of glycerol and what?
a) Amino acids
b) Glucose
c) Fatty acids
d) Nucleotides
31. What type of molecule is starch?
a) Protein
b) Lipid
c) Carbohydrate
d) Enzyme
32. Which is a function of proteins?
a) Energy storage
b) Enzyme catalysis
c) Genetic code
d) Insulation
33. What are enzymes made of?
a) Lipids
b) Nucleic acids
c) Proteins
d) Carbohydrates
34. Which molecule provides quick energy?
a) Lipids
b) Glucose
c) DNA
d) Protein
35. What is a polymer of nucleotides?
a) Protein
b) DNA
c) Lipid
d) Carbohydrate
36. Which cell part is only in plant cells?
a) Mitochondria
b) Ribosomes
c) Cell wall
d) Cytoplasm
37. Which is a function of the vacuole in plant cells?
a) Control activities
b) Store substances
c) Make proteins
d) Do photosynthesis
38. What does the retina contain?
a) Blood vessels
b) Pigment
c) Light-sensitive cells
d) Fluid
39. What helps the eye to focus on near and far objects?
a) Retina
b) Iris
c) Lens
d) Pupil
40. What enters the stomata during photosynthesis?
a) Oxygen
b) Carbon dioxide
c) Water
d) Glucose
