Tag: lesson-5813

{“lesson_id”:5813,”category_id”:0,”topic”:””,”choices”:[“Photosynthesis”,”Pollen formation”,”Absorption of water and minerals”,”Transpiration of sucrose”],”correct”:2,”type”:”mcq”,”explain”:”Roots absorb water and dissolved minerals from soil; leaves do most photosynthesis.”}

{“lesson_id”:5813,”category_id”:0,”topic”:””,”choices”:[“Endodermis”,”Apical meristem”,”Vascular bundle”,”Root hair zone”],”correct”:1,”type”:”mcq”,”explain”:”The cap covers the root tip so the dividing apical meristem is not damaged as the root pushes through soil.”}

{“lesson_id”:5813,”category_id”:0,”topic”:””,”choices”:[“Epidermal cells”,”Xylem vessels”,”Cortical cells”,”Companion cells”],”correct”:0,”type”:”mcq”,”explain”:”Root hairs are unicellular outgrowths of the epidermis that increase the absorptive surface.”}

{“lesson_id”:5813,”category_id”:0,”topic”:””,”choices”:[“Most monocots”,”Bryophytes”,”Most dicots”,”Algae”],”correct”:2,”type”:”mcq”,”explain”:”Dicots commonly have a persistent primary root (tap root); monocots usually have fibrous roots.”}

{“lesson_id”:5813,”category_id”:0,”topic”:””,”choices”:[“Endodermis”,”Pith”,”Epidermis”,”Root cap”],”correct”:0,”type”:”mcq”,”explain”:”Suberised Casparian strips in endodermal walls force water through the protoplast, helping selective uptake.”}

{“lesson_id”:5813,”category_id”:0,”topic”:””,”choices”:[“Liverworts”,”Cacti tap roots”,”Monocots such as grasses”,”Most gymnosperms only”],”correct”:2,”type”:”mcq”,”explain”:”In many monocots the primary root is short-lived and replaced by a bunch of adventitious fibrous roots.”}

{“lesson_id”:5813,”category_id”:0,”topic”:””,”choices”:[“Storage of starch”,”Climbing”,”Aeration in waterlogged soil”,”Nitrogen fixation”],”correct”:2,”type”:”mcq”,”explain”:”Breathing roots (pneumatophores) of mangroves grow upward and have lenticels for gas exchange.”}

{“lesson_id”:5813,”category_id”:0,”topic”:””,”choices”:[“Mycorrhizal fungi only”,”Rhizobium and nitrogen fixation”,”Photoperiodism”,”Transpiration pull”],”correct”:1,”type”:”mcq”,”explain”:”Symbiotic Rhizobium in nodules reduces N₂ to ammonia that the plant can use.”}

{“lesson_id”:5813,”category_id”:0,”topic”:””,”choices”:[“Storage tap root”,”Pneumatophore”,”Prop root”,”Fibrous root”],”correct”:0,”type”:”mcq”,”explain”:”The swollen tap root of carrot stores food.”}

{“lesson_id”:5813,”category_id”:0,”topic”:””,”choices”:[“True”,”False”],”correct”:0,”type”:”true_false”,”explain”:”A dense covering of root hairs multiplies contact with soil water.”}