वनस्पति विज्ञान – Botany – Botany MCQ
वनस्पति विज्ञान – Botany – CEE प्रवेश
Botany · Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · ४०७ प्रश्न
४०७ प्रश्न उपलब्ध। मोड छान्नुहोस्:
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
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The term 'alternation of generations' describes the life cycle of many plants. Which process specifically refers to the multicellular haploid stage that produces gametes?
सही उत्तर: ख) Gametophyte generation
Alternation of generations involves a diploid sporophyte phase producing haploid spores, which then develop into the dominant gametophyte generation. The 'gametophyte generation' is specifically the multicellular haploid stage responsible for producing gametes (spores or gametes themselves).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is NOT a primary function performed by phloem in vascular plants?
सही उत्तर: घ) Delivering water to photosynthetic cells
Phloem's main role is the transport of organic nutrients, particularly sugars. While it facilitates the movement of other substances like amino acids and hormones, its primary function isn’t supporting cell elongation which is primarily a function of xylem or delivering water to photosynthetic cells - these are functions of the xylem.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of 'double fertilization' results in the formation of which two structures within an angiosperm seed?
सही उत्तर: ख) An embryo and an endosperm
Double fertilization is a key characteristic of flowering plants (angiosperms). It involves the fusion of a male gamete with two different cells within the ovule – one to form the zygote (embryo), and the other to form the endosperm, which nourishes the developing embryo. The other options describe different developmental events but don't represent double fertilization.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of ‘senescence’ in plants involves: (a) Rapid cell division and growth. (b) Increased photosynthetic activity. (c) The aging and eventual death of differentiated plant tissues. (d) The formation of new roots and shoots.
सही उत्तर: ख) (b) Increased photosynthetic activity.
Senescence refers to the stage where plant cells lose their ability to divide and function properly, leading to aging and ultimately cell death – option (c). Options (a), (b), and (d) describe processes in plant development.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following structures is primarily responsible for facilitating the exchange of gases (carbon dioxide and oxygen) between a plant and its environment? (a) Xylem vessels (b) Phloem sieve tubes (c) Stomata (d) Epidermal cells
सही उत्तर: ग) (c) Stomata
Stomata are pores on the surface of leaves that regulate gas exchange and water transpiration. The xylem transports water and nutrients, phloem transports sugars, and epidermal cells form the outer layer of the plant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of ‘geotropism’ refers to: (a) The movement of plants towards light. (b) The growth response of plants to gravity. (c) The process of seed germination. (d) The absorption of water by plant roots.
सही उत्तर: ख) (b) The growth response of plants to gravity.
Geotropism is the directional growth or turning of a plant in response to the force of gravity. Specifically, it's the movement in response to gravity – option (b). Options (a), (c), and (d) describe different biological processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes the role of CAM plants? (a) They perform C3 photosynthesis under all conditions. (b) They open their stomata during the day to maximize carbon dioxide uptake. (c) They initially fix CO2 into a 4-carbon compound and then release it for fixation at night. (d) They rely solely on photophosphorylation for energy production.
सही उत्तर: ग) (c) They initially fix CO2 into a 4-carbon compound and then release it for fixation at night.
CAM (Crassulacean Acid Metabolism) plants are adapted to arid conditions. They open their stomata at night to fix CO2, reducing water loss during the day – a key feature described in option (c). Options (a), (b), and (d) are incorrect.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The term ‘chloroplast’ refers to: (a) The cellular structure responsible for protein synthesis. (b) The organelle where photosynthesis takes place. (c) The pigment that absorbs light energy in plants. (d) A type of cell division occurring in plant tissues.
सही उत्तर: ख) (b) The organelle where photosynthesis takes place.
The chloroplast is the specialized organelle within plant cells where photosynthesis occurs. Option (a) describes ribosomes, (c) refers to chlorophyll, and (d) describes mitosis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The vascular bundle in a maize plant is characterized by: (a) Presence of sclerenchyma cells only. (b) Arrangement of phloem on the outer side and xylem on the inner side. (c) Occurrence of both pholem and xylem in conjoint manner. (d) Absence of any parenchyma cells.
सही उत्तर: घ) (d) Absence of any parenchyma cells.
The vascular bundle in maize (corn) is a conjoint bundle containing both phloem and xylem arranged together with sclerenchyma cells for support. This arrangement differs from many other plants.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the role of chlorophyll ‘a’ and chlorophyll ‘b’ in photosynthesis? (a) They directly absorb sunlight energy and convert it into chemical energy. (b) They regenerate ATP and NADPH molecules after they have been used in the light-dependent reactions. (c) They protect the photosynthetic apparatus from excessive light damage. (d) They are involved in the initial carbon fixation steps of photosynthesis.
सही उत्तर: ख) (b) They regenerate ATP and NADPH molecules after they have been used in the light-dependent reactions.
Chlorophyll a is the primary pigment responsible for absorbing sunlight and initiating the photosynthetic process. Chlorophyll b assists by broadening the range of wavelengths absorbed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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