{"id":88675,"date":"2025-06-01T07:18:02","date_gmt":"2025-06-01T07:18:02","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88675"},"modified":"2025-06-01T07:18:02","modified_gmt":"2025-06-01T07:18:02","slug":"which-one-of-the-following-cell-organelles-may-play-a-role-in-expellin","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-cell-organelles-may-play-a-role-in-expellin\/","title":{"rendered":"Which one of the following cell organelles may play a role in expellin"},"content":{"rendered":"

Which one of the following cell organelles may play a role in expelling excess water and wastes in case of unicellular organisms ?<\/p>\n

[amp_mcq option1=”Lysosome” option2=”Vacuole” option3=”Golgi body” option4=”Endoplasmic reticulum” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2020<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nIn many freshwater unicellular organisms like *Paramecium* or *Amoeba*, contractile vacuoles are specialized organelles that collect excess water that enters the cell by osmosis and periodically expel it out. This process is crucial for osmoregulation, preventing the cell from bursting in a hypotonic environment. Wastes can also be expelled via this mechanism or through other means like diffusion or exocytosis.
\n<\/section>\n
\n– Vacuoles in unicellular organisms can include contractile vacuoles, which are vital for maintaining osmotic balance by expelling excess water.
\n– Lysosomes are involved in intracellular digestion.
\n– Golgi body (or Golgi apparatus) is involved in modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles.
\n– Endoplasmic reticulum is involved in protein and lipid synthesis.
\n<\/section>\n
\nContractile vacuoles are found mainly in protists living in freshwater habitats. Their rate of pulsation is regulated by the osmotic potential of the surrounding medium; they pump faster in more dilute environments. While primarily for water expulsion, they also contribute to the removal of some metabolic wastes.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following cell organelles may play a role in expelling excess water and wastes in case of unicellular organisms ? [amp_mcq option1=”Lysosome” option2=”Vacuole” option3=”Golgi body” option4=”Endoplasmic reticulum” correct=”option2″] This question was previously asked in UPSC NDA-2 – 2020 Download PDFAttempt Online In many freshwater unicellular organisms like *Paramecium* or *Amoeba*, contractile vacuoles … <\/p>\n

Detailed SolutionWhich one of the following cell organelles may play a role in expellin<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1094],"tags":[1288,1117,1152],"class_list":["post-88675","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1288","tag-biology","tag-cell","no-featured-image-padding"],"yoast_head":"\nWhich one of the following cell organelles may play a role in expellin<\/title>\n<meta name=\"description\" content=\"In many freshwater unicellular organisms like *Paramecium* or *Amoeba*, contractile vacuoles are specialized organelles that collect excess water that enters the cell by osmosis and periodically expel it out. This process is crucial for osmoregulation, preventing the cell from bursting in a hypotonic environment. Wastes can also be expelled via this mechanism or through other means like diffusion or exocytosis. - Vacuoles in unicellular organisms can include contractile vacuoles, which are vital for maintaining osmotic balance by expelling excess water. - Lysosomes are involved in intracellular digestion. - Golgi body (or Golgi apparatus) is involved in modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles. - Endoplasmic reticulum is involved in protein and lipid synthesis.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-cell-organelles-may-play-a-role-in-expellin\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following cell organelles may play a role in expellin\" \/>\n<meta property=\"og:description\" content=\"In many freshwater unicellular organisms like *Paramecium* or *Amoeba*, contractile vacuoles are specialized organelles that collect excess water that enters the cell by osmosis and periodically expel it out. This process is crucial for osmoregulation, preventing the cell from bursting in a hypotonic environment. Wastes can also be expelled via this mechanism or through other means like diffusion or exocytosis. - Vacuoles in unicellular organisms can include contractile vacuoles, which are vital for maintaining osmotic balance by expelling excess water. - Lysosomes are involved in intracellular digestion. - Golgi body (or Golgi apparatus) is involved in modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles. - Endoplasmic reticulum is involved in protein and lipid synthesis.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-cell-organelles-may-play-a-role-in-expellin\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:18:02+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following cell organelles may play a role in expellin","description":"In many freshwater unicellular organisms like *Paramecium* or *Amoeba*, contractile vacuoles are specialized organelles that collect excess water that enters the cell by osmosis and periodically expel it out. 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