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In this Class 10 Science topic from the Life Processes chapter, students learn how materials move within plants and animals to support survival. The topic explains the human circulatory system, including the heart, blood, blood vessels, double circulation, and lymph, along with the transport of oxygen, nutrients, hormones, and wastes. It also covers transport in plants through xylem and phloem, and shows how transpiration helps in the movement of water and minerals from roots to leaves.
Hard · Level 1 · 1 questions
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Because food must be actively moved from the source to parts that need it
Because phloem is made only of dead cells
Because food flies in air by itself
Because phloem only drops water downward
Question 1HardLevel 1
Why is food transport in phloem considered energy dependent?फ्लोएम में भोजन का परिवहन ऊर्जा पर निर्भर क्यों माना जाता है?
Correct answer:सही उत्तर:A
Phloem translocation distributes sugars such as sucrose from a source, usually a photosynthesising leaf, to sinks such as roots, fruits, seeds, or growing tissues. Loading sugars into sieve tubes and maintaining the pressure gradient require metabolic energy, especially from companion cells. Transport can occur in different directions according to demand. Therefore A is correct; the other choices wrongly describe phloem as dead tissue or a water-only pathway.फ्लोएम सुक्रोज जैसे शर्करा को स्रोत, सामान्यतः प्रकाश-संश्लेषण करने वाली पत्ती, से जड़, फल, बीज या बढ़ते ऊतकों जैसे गंतव्य तक पहुंचाता है। शर्करा को चालनी नलिकाओं में भरने और दाब प्रवणता बनाए रखने में, विशेषकर सहचारी कोशिकाओं द्वारा, चयापचयी ऊर्जा लगती है। परिवहन आवश्यकता के अनुसार अलग दिशाओं में हो सकता है। इसलिए A सही है; बाकी विकल्प फ्लोएम को मृत या केवल जल-वाहक बताते हैं।
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