वनस्पति विज्ञान – Botany – Botany MCQ

वनस्पति विज्ञान – Botany: प्रश्न र उत्तर

सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।

सही: ० / ०

151. Which of the following best describes the role of ‘bryophytes’ in ecological succession?

     कA. They are the dominant plants in climax communities due to their high photosynthetic rates. खB. They represent the first colonizers of barren environments, forming a basic soil layer. गC. They exclusively thrive in nutrient-rich soils and compete effectively with other plant species. घD. They require constant direct sunlight for survival and are rarely found at lower elevations.
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

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     टिप्पणी जाँचपछि मात्र देखिन्छ।

152. The process of secondary growth in plants leads to an increase in stem diameter. Which cell type primarily contributes to this thickening?

     कA. Palisade cells खB. Mesophyll cells गC. Vascular cambium घD. Epidermal cells
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

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     टिप्पणी जाँचपछि मात्र देखिन्छ।

153. In bryophytes (mosses and liverworts), which phase of the life cycle is predominantly dominant?

     कSporophyte खGametophyte गCalmose घZoosporangium
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154. Which of the following micronutrients is essential for the activity of the nitrogenase enzyme?

     कIron खNitrogen गMolybdenum घZinc
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155. The potato tuber develops as a modified _____, playing a key role in vegetative propagation.

     कStem खLeaf गRoot घFlower
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156. Which of the following statements accurately describes Cycadophyta (क्याडोपता) as a ‘living fossil’?

     कThey possess the most complex vascular system among gymnosperms खTheir evolutionary history can be traced back to ancient plant lineages, exhibiting relatively little change over millions of years गThey are highly adaptable to diverse environmental conditions, enabling rapid colonization of new habitats घThey have the highest metabolic rate compared to other gymnosperms
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

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157. The application of ethephon to ripening bananas is based on its ability to:

     कIncrease chlorophyll production खStimulate cell division and expansion गInduce ethylene biosynthesis, accelerating fruit maturation घDecrease carbon dioxide concentration in the fruit
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158. Which of the following best describes the role of chlorophyll molecules within photosystems during photolysis of water?

     कThey absorb light energy and initiate electron transport chain खThey directly catalyze the splitting of water into hydrogen ions and oxygen गThey neutralize excess electrons generated in the reaction घThey act as a protective barrier against excessive UV radiation
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159. The primary photosynthetic product of photosynthesis, which directly contributes to the formation of glucose during the Calvin cycle, is:

     कOxygen खCarbon Dioxide गGlucose घWater
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160. In a typical dicotyledonous leaf, stomata are predominantly located on:

     कThe upper epidermis only खBoth the adaxial (upper) and abaxial (lower) surfaces of the leaf गOnly the lower epidermis घRandomly distributed across all three epidermal layers
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

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     टिप्पणी जाँचपछि मात्र देखिन्छ।