Usman

Tag: lesson-5660

  • Xylem mainly transports:

    {“lesson_id”:5660,”category_id”:0,”topic”:””,”choices”:[“Oxygen into soil”,”Water and minerals upward”,”Pollen”,”Sucrose to roots only”],”correct”:1,”type”:”mcq”,”explain”:”Xylem conducts the transpiration stream of water and dissolved minerals from roots to shoot.”}

  • Phloem mainly transports:

    {“lesson_id”:5660,”category_id”:0,”topic”:””,”choices”:[“Pollen tubes”,”Organic food such as sucrose”,”Only mineral ions”,”Only carbon dioxide”],”correct”:1,”type”:”mcq”,”explain”:”Sieve tubes move photosynthate from source to sink.”}

  • Which xylem cells are typically dead at maturity?

    {“lesson_id”:5660,”category_id”:0,”topic”:””,”choices”:[“Root hairs”,”Tracheids and vessels”,”Sieve-tube elements”,”Companion cells”],”correct”:1,”type”:”mcq”,”explain”:”Conducting xylem elements lose their protoplast; the lignified wall remains as a pipe.”}

  • Sieve tubes of phloem are:

    {“lesson_id”:5660,”category_id”:0,”topic”:””,”choices”:[“Only found in roots”,”Living cells with cytoplasm”,”The same as tracheids”,”Dead empty pipes like vessels”],”correct”:1,”type”:”mcq”,”explain”:”Sieve-tube elements remain living but are controlled by companion cells.”}

  • Companion cells are closely associated with:

    {“lesson_id”:5660,”category_id”:0,”topic”:””,”choices”:[“Sieve tubes”,”Guard cells only”,”Tracheids”,”Root cap cells”],”correct”:0,”type”:”mcq”,”explain”:”Companion cells load and unload sieve tubes and keep them alive.”}

  • Vessels are characteristic of:

    {“lesson_id”:5660,”category_id”:0,”topic”:””,”choices”:[“Algae”,”Most angiosperms”,”Mosses”,”Most gymnosperms”],”correct”:1,”type”:”mcq”,”explain”:”Efficient vessel elements are typical of flowering plants; many gymnosperms have tracheids only.”}

  • The cohesion–tension mechanism explains flow in:

    {“lesson_id”:5660,”category_id”:0,”topic”:””,”choices”:[“Epidermis”,”Xylem”,”Phloem”,”Cambium”],”correct”:1,”type”:”mcq”,”explain”:”Transpiration pull, cohesion of water, and adhesion to walls drive ascent of sap.”}

  • A vascular bundle contains:

    {“lesson_id”:5660,”category_id”:0,”topic”:””,”choices”:[“Only stomata”,”Only palisade cells”,”Xylem and phloem (often with cambium)”,”Only pith”],”correct”:2,”type”:”mcq”,”explain”:”Xylem and phloem together form the bundle; in dicot stems a fascicular cambium may lie between them.”}

  • Food in phloem generally moves:

    {“lesson_id”:5660,”category_id”:0,”topic”:””,”choices”:[“From source to sink in either direction”,”Only at night”,”Only in xylem”,”Only upward”],”correct”:0,”type”:”mcq”,”explain”:”Direction depends on where sugar is produced or needed.”}

  • True or false: Phloem transport is called translocation.

    {“lesson_id”:5660,”category_id”:0,”topic”:””,”choices”:[“True”,”False”],”correct”:0,”type”:”true_false”,”explain”:”Translocation is the movement of organic solutes in phloem.”}