Epidermis is derived from:-

1. phellogen

2. cambium

3. procambium

4. none of these

Subtopic:  Epidermal Tissue System |
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Passage cells are found in 

1. Dicot stem

2. Monocot root

3. Monocot stem

4. All of these

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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

Subtopic:  Dicot Stem |
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The 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

Subtopic:  Meristematic Tissue: Root Apex |
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The sugarcane plant has:-

1. dumb-bell shaped guard cells

2. pentamerous flowers

3. reticulate venation

4. capsular fruits

Subtopic:  Epidermal Tissue System |
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In 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

Subtopic:  Activity of Cork Cambium |
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Companion cells in plants are associated with

(1) vessels

(2) sperms

(3) sieve elements

(4) guard cells.

Subtopic:  Complex Tissue: Phloem |
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Cork 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

Subtopic:  Activity of Cork Cambium |
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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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