Question

विषम बीजाणुता क्या हैं ? समझाइये।​

Answer 1

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Asymmetries in cell growth and division occur in eukaryotes and prokaryotes alike. Even seemingly simple and morphologically symmetric cell division processes belie inherent underlying asymmetries in the composition of the resulting daughter cells. We consider the types of asymmetry that arise in various bacterial cell growth and division processes, which include both conditionally activated mechanisms and constitutive, hardwired aspects of bacterial life histories. Although asymmetry disposes some cells to the deleterious effects of aging, it may also benefit populations by efficiently purging accumulated damage and rejuvenating newborn cells. Asymmetries may also generate phenotypic variation required for successful exploitation of variable environments, even when extrinsic changes outpace the capacity of

cells to sense and respond to challenges. We propose specific experimental approaches to further develop our understanding of the prevalence and the ultimate importance of asymmetric bacterial growth.

Asymmetric cell growth—cell elongation and division processes that produce distinct daughter cell morphologies and/or physiologies—enjoys a well-understood and well-recognized place in eukaryotic biology. Cell division asymmetries occur in diverse eukaryotes ranging from single-celled pro

and yeasts to multicellular organisms, where asymmetric cell fates underlie complex developmental processes (57, 66, 78, 83).

Answer 2

Answer:

विषम बीजाणुता का अर्थ है पौधे में दो प्रकार के बीजाणु मिलना जो आकारिकी व् कार्यिकी में भिन्न होते हैं। इन्हें लघु बीजाणु (microspore ) तथा गुरुबीजाणु (megaspore ) कहते हैं। यह स्थिति सिलेजिनेला तथा साल्वीनिया में मिलती है। विषम बीजाणुता में गुरुबीजाणु पौधे में ही रहता है तथा वहीं निषेचन होता है