Which 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.

Subtopic:  Complex Tissue: Phloem |
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Grafting 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

Subtopic:  Activity of Vascular Cambium |
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In 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

Subtopic:  Complex Tissue: Phloem |
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Bark refers to 

(1) Phellem + Phellogen + Phelloderm

(2) Periderm + Cortex

(3) Phellem + Phelloderm + Secondary phloem

(4) Periderm + Cortex + Pericycle + Secondary phloem

Subtopic:  Activity of Cork Cambium |
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The branched sclereids present in hydrophytes are:-
(1) osteosclereids

(2) trichosclereids

(3) macrosclereids

(4) astrosclereids

Subtopic:  Simple Tissue: Chollenchyma & Sclerenchyma |
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Why are vascular bundles closed in monocots?

(1) Xylem and Phloem are present

(2) Xylem and phloem occur in separate bundles

(3) Vascular cambium is present between xylem and phloem

(4) Vascular cambium is not present

Subtopic:  Vascular Tissue System |
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Given figure shows:-

(a) structure of lenticel
(b) hydathode showing gaseous vapour exchange
(c) fungus reproducing by spore formation
(d) algae reproducing by spore formation

Subtopic:  Activity of Cork Cambium |
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Select the correct pair amongst the following.
(1) Spring wood  - light colour, high density

(2) Spring wood  - dark colour, low density

(3) Autumn wood - light colour, high density

(4) Autumn wood - dark colour, high density

Subtopic:  Types of Wood |
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As secondary growth proceeds, in a dicot stem, the thickness of.

(1) sapwood increases

(2) heartwood increases

(3) both sapwood and heartwood increases

(4) both sapwood and heartwood remains the same

Subtopic:  Types of Wood |
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The desert grasses, often curls their leaf to minimise water loss due to presence of 

(1) Spines

(2) Palisade parenchyma

(3) Bundle sheath cells

(4) Bulliform cells

Subtopic:  Monocot Leaf |
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