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 'chlorosis' in plants refers to:
सही उत्तर: क) Yellowing of leaves due to nutrient deficiency
Chlorosis literally means ‘yellowing.’ It specifically describes the yellow discoloration of plant leaves caused by a lack of chlorophyll, typically nitrogen or magnesium. The other options represent different physiological processes in plants.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of 'wound healing' in plants primarily involves the activity of: (a) Ethylene (b) Cell proliferation and differentiation at the injury site. (c) Jasmonates only (d) Brassinosteroids
सही उत्तर: ख) (b) Cell proliferation and differentiation at the injury site.
Wound healing in plants is a complex process involving active cell division (proliferation) and specialization (differentiation) to form a callus – this option best describes that cellular mechanism.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following plant hormones plays a crucial role in root development and growth? (a) Auxin (b) Gibberellin (c) Cytokinin (d) Abscisic acid
सही उत्तर: क) (a) Auxin
Auxins are particularly known for their influence on root initiation and growth. Gibberellins promote stem elongation, cytokinins mainly stimulate cell division and bud formation, while abscisic acid is involved in stress responses.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The term ‘etiolation’ in plants refers to: (a) The process of fruit ripening. (b) Excessive growth due to lack of light. (c) The formation of flower buds. (d) The absorption of water through the roots.
सही उत्तर: ख) (b) Excessive growth due to lack of light.
Etiolation describes a plant's response to low light conditions – characterized by rapid stem elongation and pale green leaves. This is distinctly different from the other options.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements best describes the process of pollination? (a) The fusion of male and female gametes within the ovule. (b) The transfer of pollen grains from the anther to the stigma. (c) The development of the zygote into an embryo. (d) The absorption of nutrients by the developing seed.
सही उत्तर: ख) (b) The transfer of pollen grains from the anther to the stigma.
Pollination is fundamentally about moving pollen; option (b) accurately describes this transfer process. Options (a), (c), and (d) represent subsequent stages in fertilization.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary function of chloroplasts in plant cells is: (a) Protein synthesis (b) Photosynthesis (c) Lipid storage (d) Cell division
सही उत्तर: ख) (b) Photosynthesis
Photosynthesis is the process by which plants convert light energy into chemical energy in the form of sugars. Options (a), (c), and (d) represent other cellular functions, not the core role of chloroplasts.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Mature sieve tube elements of angiosperms lack: a) Cell walls b) Cytoplasm c) Nucleus d) Vacuoles
सही उत्तर: ग) c) Nucleus
Sieve tube elements are specialized cells for transporting sugars and lack a nucleus and most cytoplasm to minimize obstructions. They retain their cell walls and vacuoles for efficient transport. Options (a), (c) and (d) are features of sieve tube elements.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process by which plants respond to light, utilizing photoreceptor pigments like phytochrome that exist in red and far-red absorbing forms, is known as: a) Phototropism b) Geotropism c) Photoperiodism d) Chemotropism
सही उत्तर: ग) c) Photoperiodism
Photoperiodism is the direct response of plants to changes in day length. Phytochrome, with its red and far-red absorption characteristics, plays a central role in sensing these light signals. Option (a), phototropism, describes growth towards light, option (b) geotropism describes growth in response to gravity, and option (d) is not a recognized plant response.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of ‘geitonogamy’ involves pollination between flowers that are:
सही उत्तर: ग) Adjacent to each other
Geitonogamy refers to pollen transfer between flowers growing on the same plant but without physical contact. This is a type of cross-pollination. The options describing self pollination, or pollination from separate plants are incorrect.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which plant hormone plays a crucial role in promoting fruit ripening?
सही उत्तर: ग) Ethylene
Ethylene is a key regulator of fruit ripening. It stimulates the breakdown of cell walls, leading to softening and changes associated with ripeness. While other hormones have roles in plant growth, ethylene specifically triggers the ripening process in many fruits.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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