Q.16 The organelle absent in plant cells is
- Vacuoles
- Lysosome
- Chloroplast
- Centriole
Plant cells differ from animal cells due to their unique organelles adapted for photosynthesis and structural support. The organelle absent in plant cells among the options is the centriole, a key structure for animal cell division.
Organelle Absent in Plant Cells Explained
The organelle absent in plant cells is a common biology exam question testing knowledge of cell structure differences between plants and animals. Plant cells feature specialized organelles for photosynthesis and rigidity, while lacking certain animal-specific components.
Plant cells are eukaryotic with membrane-bound organelles, but they prioritize functions like light energy conversion over animal-specific motility and division structures.
Option Analysis
Vacuoles
Present in plant cells. A large central vacuole occupies up to 90% of the cell volume, maintaining turgor pressure, storing nutrients, and aiding waste disposal. Unlike small animal vacuoles, plant ones regulate osmosis for structural support.
Lysosome
Absent or rare in plant cells. Lysosomes handle intracellular digestion in animals via hydrolytic enzymes. Plants perform similar roles through vacuoles or peroxisomes, so true lysosomes are not standard organelles in higher plants.
Chloroplast
Present only in plant cells. Chloroplasts conduct photosynthesis, containing chlorophyll in thylakoids to convert light into chemical energy (glucose). Absent in animals, they define plant cell identity.
Centriole
Absent in plant cells (Correct Answer). Centrioles organize microtubules during animal cell mitosis and form basal bodies for cilia/flagella. Plants use alternative microtubule arrays for division and lack motility structures, making centrioles unnecessary.
Option Presence in Plant Cells Key Function Why Correct/Incorrect Vacuoles Present Turgor pressure, storage Incorrect: Essential for plants Lysosome Absent/rare Digestion (vacuoles substitute) Close, but vacuole fulfills role Chloroplast Present Photosynthesis Incorrect: Plant hallmark Centriole Absent Mitosis in animals Correct: Plants lack it Key Takeaways for Exam Prep
Mastering the organelle absent in plant cells helps distinguish prokaryotic, animal, and plant cells in NEET or board exams. Remember: Plants have chloroplasts, large vacuoles, and cell walls but no centrioles or typical lysosomes. Visualize via labeled diagrams for retention.
