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

91. The term ‘alternation of generations’ in plant life cycles refers to: (a) A sudden shift in the plant's developmental pathway due to environmental changes. (b) The cyclical transition between a haploid, unicellular stage (spore) and a diploid, multicellular stage (gametophyte). (c) A process where plants alternate between photosynthetic and non-photosynthetic phases. (d) A genetically programmed sequence of events controlling plant growth from seed to maturity.

    कA sudden shift in the plant's developmental pathway due to environmental changes. खThe cyclical transition between a haploid, unicellular stage (spore) and a diploid, multicellular stage (gametophyte). गA process where plants alternate between photosynthetic and non-photosynthetic phases. घA genetically programmed sequence of events controlling plant growth from seed to maturity.
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

92. Which of the following correctly identifies the role of abscisic acid (ABA) in plant physiology? (a) It stimulates rapid cell division and promotes fruit development. (b) It triggers stomatal closure during water stress conditions. (c) It enhances chlorophyll production, increasing photosynthetic rates. (d) It plays a critical role in the formation of new root tips.

    कIt stimulates rapid cell division and promotes fruit development. खIt triggers stomatal closure during water stress conditions. गIt enhances chlorophyll production, increasing photosynthetic rates. घIt plays a critical role in the formation of new root tips.
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

93. The process of transpiration in plants primarily involves: (a) The absorption of nutrients from the soil by root hairs. (b) The movement of water and dissolved minerals upwards through the xylem vessels. (c) The release of oxygen into the atmosphere during photosynthesis. (d) The uptake of carbon dioxide from the environment for use in cellular respiration.

    कThe absorption of nutrients from the soil by root hairs. खThe movement of water and dissolved minerals upwards through the xylem vessels. गThe release of oxygen into the atmosphere during photosynthesis. घThe uptake of carbon dioxide from the environment for use in cellular respiration.
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

94. Which of the following statements accurately describes the significance of CAM photosynthesis in arid environments? (a) It relies on a high rate of carbon dioxide fixation for rapid growth. (b) It maximizes water use efficiency by minimizing CO2 uptake during the day. (c) It is less energy-efficient than C3 photosynthesis due to the complexity of its pathways. (d) It exclusively occurs in plants with large, broad leaves.

    कIt relies on a high rate of carbon dioxide fixation for rapid growth. खIt maximizes water use efficiency by minimizing CO2 uptake during the day. गIt is less energy-efficient than C3 photosynthesis due to the complexity of its pathways. घIt exclusively occurs in plants with large, broad leaves.
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

95. The primary function of phloem in plants is to: (a) Transport water and minerals upwards from roots. (b) Translocate sugars produced during photosynthesis to other parts of the plant. (c) Provide structural support to the stem and leaves. (d) Facilitate gas exchange between the atmosphere and the leaf tissues.

    कTransport water and minerals upwards from roots. खTranslocate sugars produced during photosynthesis to other parts of the plant. गProvide structural support to the stem and leaves. घFacilitate gas exchange between the atmosphere and the leaf tissues.
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

96. The phenomenon of ‘dormancy’ in seed germination refers to:

    कRapid, immediate sprouting of the seed. खA period of suspended growth and development in a seed, allowing it to survive unfavorable conditions. गThe process of pollination by insects. घThe absorption of water into the seed before germination.
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

97. The process of osmosis primarily involves the movement of which substance across a semi-permeable membrane?

    कOxygen molecules खCarbon dioxide molecules गWater molecules घGlucose molecules
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    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

98. The process of pollination involves the transfer of pollen grains from the anther to the stigma. Which of the following mechanisms is *least* likely to facilitate this transfer?

    कWind pollination. खInsect pollination. गSelf-pollination. घGravity-assisted movement.
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

99. Which of the following best describes the role of abscisic acid (ABA) in plant physiology?

    कPromoting seed germination. खStimulating chlorophyll production during photosynthesis. गInducing stomatal closure under water stress. घFacilitating pollination by attracting insects.
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

    टिप्पणी जाँचपछि मात्र देखिन्छ।

100. Which of the following processes is most directly associated with the formation of phloem?

     कTranspiration. खCell division in xylem. गActive transport of minerals through roots. घLateral meristematic activity within cambium.
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।