Which of the following statement is not true for chloroplast? | Agrigyan

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ICAR AIEEA PG 2024 - Physical Science

MCQ (Single Correct)

Which of the following statement is not true for chloroplast?

क्लोरोप्लास्ट (हरितलवक) के लिए

निम्नलिखित में से कौन सा कथन सत्य नहीं है?

It contains DNA as its genetic material इसमें आनुवंशिक सामग्री के रूप में डीएनए होता है It produces ATP यह एटीपी का उत्पादन करता है It has an electron transport chain इसमें एक इलेक्ट्रॉन परिवहन श्रृंखला होती है It contains transcriptional but no translational apparatus इसमें अनुलेखन तंत्र तो होता है लेकिन कोई अनुवाद तंत्र नहीं होता

Chloroplasts are semi-autonomous endosymbiotic organelles:
Statement 1 is true: Chloroplasts contain their own circular, double-stranded DNA (cpDNA/plastome).
Statement 2 is true: Photophosphorylation in thylakoid membranes synthesizes ATP via ATP synthase driven by a proton gradient.
Statement 3 is true: Photosystems II and I coupled with cytochrome $b_6f$, plastoquinone, plastocyanin, and ferredoxin form a photosynthetic electron transport chain.
Statement 4 is NOT true: Chloroplasts contain BOTH transcriptional machinery (RNA polymerases) AND complete translational machinery (including 70S prokaryotic-type ribosomes, tRNAs, initiation and elongation factors). Chloroplasts actively translate multiple plastid-encoded proteins (such as the large subunit of Rubisco and PS II core proteins).

Therefore, Statement 4 is incorrect and hence the right answer.

क्लोरोप्लास्ट (हरितलवक) अर्ध-स्वायत्त कोशिकांग हैं:
कथन 1 सत्य है: क्लोरोप्लास्ट में अपना गोलाकार, द्विकुंडलित डीएनए (cpDNA) पाया जाता है।
कथन 2 सत्य है: थाइलाकोइड झिल्लियों में प्रकाश-फॉस्फोराइलेशन द्वारा एटीपी (ATP) का संश्लेषण होता है।
कथन 3 सत्य है: इसमें PS-II, साइटोक्रोम $b_6f$ और PS-I से युक्त संपूर्ण इलेक्ट्रॉन परिवहन श्रृंखला होती है।
कथन 4 असत्य है: क्लोरोप्लास्ट में अनुलेखन (Transcription) के साथ-साथ पूर्ण अनुवाद तंत्र (Translational apparatus / 70S राइबोसोम, tRNA) भी पाया जाता है। यह रुबिस्को के बड़े सबयूनिट सहित कई प्रमुख प्रोटीनों का स्वयं संश्लेषण करता है।

अतः कथन 4 गलत है और सही उत्तर है (विकल्प 4)।

Explanation not matching this question? क्या व्याख्या इस प्रश्न से मेल नहीं खा रही? Report

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