MCQ'S: Anatomy of Flowering plants By: Aprajita shankhdhar 75 46
1 '1. Tunica corpus theory is connected with ADVERTISEMENTS: .(a) root apex . (b) root cap *(c) shoot apex (d) secondary growth.
2. Pith and cortex do not differentiate in . (a) monocot stem . (b) dicot stem . (c) monocot root (d) dicot root.
3. Which meristem helps in increasing girth? . (a) lateral meristem . (b) intercalary meristem (c) primary meristem . (d) apical meristem.
4 Cork is formed from *(a) cork cambium (phellogen) .(b) vascular cambium . (c) phloem (d) xylem.
.5. Organisation of stem apex into corpus and tunica is determined mainly by *(a) planes of cell division . (b) regions of meristematic activity .(c) rate of cell growth .(d) rate of shoot tip growth.
6 Sieve tubes are suited for translocation of food because they possess (a) bordered pits (b) no ends walls (c) broader lumen and perforated cross walls . (d) no protoplasm.
7. Death of protoplasm is a pre-requisite for a vital function like. . (a) transport of sap . (b) transport of food . (c) absorption of water .(d) gaseous exchange.
1. .. (c): Tunica corpus theory is connected with shoot . He differentiated two zones in the shoot apex, an outer apex. The concept was proposed by Schmidt, 1924. tunica and inner corpus. The tunica shows only anticlinal divisions and thus it is responsible for surface growth . Corpus is the inner mass of cells and it divides both anticlinally as well as periclinally.
2. .(a): Pith and cortex do not differentiate in monocot . Since numerous vascular bundles lie scattered, the stem ground tissue system in a monocot stem is distinguishable into hypodermis and ground parenchyma
4. .(a): In hypodermis or outer cortical cells, a layer becomes . This phellogen also cuts off cells both on its outer side and meristematic which is known as cork cambium or phellogen inner side. The cells cut off on outer side are phellem or cork cells and cells cut off on inner side are phelloderm or secondary cortex The phellem or cork cells are dead and have deposition of a fatty substance called suberin (i.e., cork cells are suberized). Suberin is impervious to water and thus cork cells are buoyant (i.e., float on water). Phellem, phellogen and phelloderm collectively constitute periderm.
6. .(c): Sieve tubes are suited for translocation of food because they possess broader lumen and perforated cross walls. Sieve tubes are elongated tubular conducting channels of phloem. The end wall possesses many small pores and have thin cellulosic wall.
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