SAU PAST PAPER 2020
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
فوٹو سنتھیس میں مندرجہ ذیل میں سے کون سا شامل ہے؟
Energy rich carbohydrates are synthesized
CO₂ and H₂ of the water
Chlorophyll alone & converts light energy to chemical energy
All of the above
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Explanation
Photosynthesis involves:
Energy-Rich Carbohydrates are Synthesized : Photosynthesis is the process by which plants convert light energy into chemical energy , primarily in the form of glucose (a carbohydrate) and other sugars. CO₂ and H₂ of Water are Reactants : During photosynthesis , plants take in carbon dioxide (CO₂) from the atmosphere and water (H₂O) from the soil. The hydrogen from the water molecule is used in the synthesis of glucose. Chlorophyll Alone Converts Light Energy to Chemical Energy : Chlorophyll , the green pigment in plants, plays a crucial role in capturing light energy. This light energy is then converted into chemical energy , which powers the synthesis of glucose.
ایڈز _____ کے ذریعہ پھیلتا ہے؟
Infected needles & syringes
Homosexuality
Immoral way of life
All of these
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Explanation
AIDS is caused by HIV .
It spreads through infected needles, sexual contact, and unsafe practices .
It is not transmitted by casual contact like touching or sharing food.
آبی آرتروپڈس _____ کے ذریعے سانس لیتے ہیں؟
Gills
Book lungs
Spiracles
None of these
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Explanation
Aquatic arthropods like crabs, prawns, and some aquatic insects use gills to extract oxygen from water.
Gills provide a large surface area for gas exchange in an aquatic environment .
جیوٹروپزم _____ کے جواب میں پودوں کی اشنکٹبندیی تحریک ہے؟
Water
Light
Gravity
None of these
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Explanation
Geotropism is the growth response of plants toward or away from gravity .
Roots show positive geotropism (grow downward) and shoots show negative geotropism (grow upward).
Kg
Km
W
N
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Explanation
The Metric System of Measurements uses the mass units: gram (g), kilogram (kg) , and tonne (t). 1000 g = 1 kg. 1000 kg = 1 tonne.
Mass was first defined in 1795
Symbol : M
فورس ، جو ہمیشہ ایک ہی نقطہ کی طرف ہدایت کی جاتی ہے اسے _____ کہا جاتا ہے؟
Central force
Gravitational force
Centripetal force
None of these
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Explanation
A central force always acts along the line joining the object and a fixed point (the center).
Gravitational and centripetal forces are specific examples of central force.
افقی میز پر پڑی ہوئی کتاب ______ توازن میں ہے۔
Dynamic
Static
Stable
None of these
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Explanation
The book is at rest with no net force or motion, so it is in static equilibrium .
Since any small push won’t topple it, it is also considered stable equilibrium on a flat surface.
ان میں سے کون پاکستان میں سب سے زیادہ استعمال ہونے والا نائٹروجنس کھاد ہے؟
Ammonium sulphate
Ammonium chloride
Urea
None of these
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Explanation
Urea is the most widely used nitrogenous fertilizer in Pakistan due to its high nitrogen content (46%).
It is cheap, effective, and easily available compared to other nitrogen fertilizers.
مندرجہ ذیل میں سے کون مونو-ایٹامک ہے؟
Oxygen
Neon
Nitrogen
None of these
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Explanation
Neon is a noble gas that exists as single atoms (mono-atomic) in nature.
Oxygen (O₂), Nitrogen (N₂), and Fluorine (F₂) are diatomic molecules.
مندرجہ ذیل میں سے کون سا مصنوعی کیمیائی کھاد ہے؟
Poultry manure
Compost
DAP
None of these
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Explanation
DAP (Diammonium Phosphate) is a synthetic chemical fertilizer rich in nitrogen and phosphorus .
Manures and compost are natural fertilizers, not synthetic.