Plastids are absent in which of the following cells?
Plastids are absent in which of the following cells?
निम्नलिखित में से किन कोशिकाओं में लवक अनुपस्थित होते हैं?
Detailed Solution & Logic
Muscle cells/ पेशी कोशिकाएँ
Explanation
Plastids are cell organelles found mainly in plant cells. They help in functions like:
-
Photosynthesis (chloroplast)
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Storage of food (leucoplast)
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Giving colour (chromoplast)
Animal cells do not contain plastids.
👉 Muscle cells are animal cells, therefore plastids are absent in them.
-
Stem cells (plant stem cells) → may contain plastids ❌
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Root cells → contain leucoplasts for storage ❌
-
Leaf cells → contain chloroplasts for photosynthesis ❌
Hence, plastids are absent in muscle cells.
व्याख्या
लवक (Plastids) कोशिका अंगक होते हैं जो मुख्यतः पादप कोशिकाओं में पाए जाते हैं। इनके कार्य हैं:
-
प्रकाश संश्लेषण (क्लोरोप्लास्ट)
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भोजन का संचय (ल्यूकोप्लास्ट)
-
रंग प्रदान करना (क्रोमोप्लास्ट)
जंतु कोशिकाओं में लवक नहीं पाए जाते।
👉 पेशी कोशिकाएँ (Muscle cells) जंतु कोशिकाएँ होती हैं, इसलिए इनमें लवक अनुपस्थित होते हैं।
-
स्टेम कोशिकाएँ → लवक हो सकते हैं ❌
-
मूल कोशिकाएँ (Root cells) → ल्यूकोप्लास्ट पाए जाते हैं ❌
-
पत्ती कोशिकाएँ (Leaf cells) → क्लोरोप्लास्ट पाए जाते हैं ❌
इसलिए सही उत्तर पेशी कोशिकाएँ है।
⭐ Extra Facts / अतिरिक्त तथ्य
🌿 English
-
Chloroplasts contain chlorophyll which traps sunlight.
-
Plastids can change from one type to another depending on function.
-
Animal cells have mitochondria but lack plastids.
🌿 हिंदी
-
क्लोरोप्लास्ट में क्लोरोफिल होता है जो सूर्य के प्रकाश को अवशोषित करता है।
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लवक आवश्यकता के अनुसार एक प्रकार से दूसरे प्रकार में बदल सकते हैं।
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जंतु कोशिकाओं में माइटोकॉन्ड्रिया होते हैं लेकिन लवक नहीं होते।
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