MCQ'S: Anatomy of Flowering plants By: Aprajita shankhdhar 75 46
1. Cork cambium and vascular cambium are *(a) parts of secondary xylem and phloem (b) parts of pericycle .(c) lateral meristem . (d) apical meristem.
2. . Collenchyma occurs in the stem and petioles of (a) xerophytes .(b) monocots . (c) dicot herbs .(d) hydrophytes.
3. Pericycle of roots produces (a) mechanical support . (b) lateral roots (c) vascular bundles . (d) adventitious buds.
4 For union between stock and scion in grafting which one is the first to occur . (a) formation of callus .(b) production of plasmodesmata . (c) differentiation of new vascular tissues .(d) regeneration of cortex and epidermis.
5. What is true about a monocot leatf . (a) reticulate venation .(b) absence of bulliform cells from epidermis .(c) mesophyll not differentiated into palisade and spongy tissues . (d) well differentiated mesophyll
6. Where do the casparian bands occur . (a) epidermis .(b) endodermis (c) pericycle .(d) phloem.
7. Which is correct about transport of conduction of substances? .(a) organic food moves up through phloem .(b) organic food moves up through xylem . (c) inorganic food moves upwardly and downwardly through xylem . (d) organic food moves upwardly and downwardly through phloem.
1. . (c): Cork cambium and vascular cambium are lateral meristems Both are responsible for the secondary growth of stem. It also increases the girth of stem.
2. (c): Collenchyma occurs in the stem and petioles of dicot herbs. Due to deposition of pectin, it has high water retaining capacity. Since pectin appears at the angles, it becomes a spongy tissues. The collenchyma is a mechanical tissue which gives tensile strength to the plant.
4 .a): Grafting is a techinque in which cambium bearing shoot (scion - graft) of one plant is joined to cambium bearing stump (root system - stock) of a related plant through different unions like tongue grafting, wedge grafting etc. In grafting union between stock and scion produces undifferentiated mass of cells called callus. Therefore, for union between stock and scion in grafting, first to occur is the formation of callus. Callus is more or less corky secondary tissue developed lay woody plants over a wound. It is derived from cambium.
6 . b): The innermost layer of soft cortex is called as endodermis. This uniseriate layer is characterised by the presence of casparian strips. This thickenings was first observed by Caspary, 1865 and hence the name.
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