Biology · Plant Anatomy
परागकणों की बाहरी दीवार में पाया जाने वाला सबसे प्रतिरोधी जैविक पदार्थ (most resistant biological material) निम्नलिखित में से कौन सा है?
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स्पोरोपोलिनिन (Sporopollenin)
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