In a dicotyledonous stem, the sequence of tissues from the outside to the inside is
(1) phellem – pericycle – endodermis – phloem
(2) phellem – phloem – endodermis – pericycle
(3) phellem – endodermis – pericycle – phloem
(4) pericycle – phellem – endodermis – phloem
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe quiescent centre in root meristem serves as:-
1. site for storage of food which is utilized during maturation
2. reservoir of growth hormones
3. reserve for replenishment of damaged cells of the meristem
4. region for absorption of water
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe sugarcane plant has:-
1. dumb-bell shaped guard cells
2. pentamerous flowers
3. reticulate venation
4. capsular fruits
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn a plant organ which is covered by periderm and in which the stomata are absent, some gaseous exchange still takes place through.
(1) aerenchyma
(2) trichomes
(3) pneumatophores
(4) lenticels
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCompanion cells in plants are associated with
(1) vessels
(2) sperms
(3) sieve elements
(4) guard cells.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCork cambium results in the formation of cork which becomes impermeable to water due to the accumulation of
(1) resins
(2) suberin
(3) lignins
(4) tannins
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich one of the following statements pertaining to plant structure is correct?
(1) Cork lacks stomata, but lenticels carry out transpiration.
(2) Passage cells help in transfer of food from cortex to phloem.
(3) Sieve tube elements possess cytoplasm but no nuclei.
(4) The shoot apical meristem has a quiescent centre.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyGrafting is successful in dicots but not in monocots because the dicots have
(1) Vascular bundles arranged in a ring
(2) Cambium for secondary growth
(3) Vessels with elements arranged end to end
(4) Cork cambium
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the sieve elements, which one of the following is the most likely function of P-proteins?
(1) Deposition of callose on sieve plates
(2) Providing energy for active translocation
(3) Autolytic enzymes
(4) Sealing mechanism on wounding
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyBark refers to
(1) Phellem + Phellogen + Phelloderm
(2) Periderm + Cortex
(3) Phellem + Phelloderm + Secondary phloem
(4) Periderm + Cortex + Pericycle + Secondary phloem
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology