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)
Storage of food (leucoplast)
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 ❌
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)
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।
लवक आवश्यकता के अनुसार एक प्रकार से दूसरे प्रकार में बदल सकते हैं।
जंतु कोशिकाओं में माइटोकॉन्ड्रिया होते हैं लेकिन लवक नहीं होते।
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