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Naked DNA is that which is
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Important Questions on Tissue and Tissue System
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A chilly plant was severely infected with Chilly Mosaic Virus (CMV). Identify the technique that helps to raise virus free plants in the next generation from the above virus infected plant.
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The balloon-shaped structures called tyloses
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Tracheids differ from the tracheary elements in:
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Which of the following are the characteristic features of phloem?
i) Gymnosperms have albuminous cells and sieve cells
ii) Presence of tracheids
iii) They store food materials in the form of starch or fat
iv) They have sieve tube elements that are long, tube-like structures
v) Their end walls are perforated in a sieve like manner
The correct combination is
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Specialized epidermal cells surrounding the guard cells are called:
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Which is the living mechanical tissue in plants?
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Identify the incorrect statements among the following.
A) Epidermal cells are parenchymatous and have small amount of cytoplasm
B) Gymnosperms have vessels in their xylem
C) In bicollateral vascular bundle, phloem is present on either side of cortex
D) Root endodermal cells have deposition of water impermeable, suberin as casparian strips
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Cortex is the region found between:
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In which type of vascular bundles are Xylem and Phloem present at the same radius?
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Conjunctive tissue is present between and in .
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Vascular bundles in monocotyledons are considered closed because:
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Match List - I with List - II.
| List-I | List-II | ||
| (a) | Cells with active cell division capacity | (i) | Vascular tissues |
| (b) | Tissue having all cells similar in structure and function | (ii) | Meristematic tissue |
| (c) | Tissue having different types of cells | (iii) | Sclereids |
| (d) | Dead cells with highly thickened walls and narrow lumen | (iv) | Simple tissue |
Select the correct answer from the options given below.
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Which of the following plants tissues cannot be used as explant in tissue culture?
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Which of the following is an incorrect statement?
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Identify the tissues based upon the following characters respectively:
| I) Large, colourless, empty cells along with leaf veins are used for absorption of water | A) Axillary bud |
| II) Cells much elongated, unbranched with pointed needle like apices and thick cell wall are dead at maturity | B) Phloem fibre |
| III) The cells are longitudinally arranged with perforated end walls | C) Bulliform cells |
| IV) Cells left behind from shoot apical meristem | D) Sieve tube elements |
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Choose the correct statements among the following.
(A) Ring arrangement of the vascular bundle is a character of the dicot system.
(B) The root hairs are branched and sometimes secretory.
(C) The storage cells in the xylem are thin-walled, made up of cellulose, and store tannin-like substances.
(D) Parenchyma cells are generally present in medullary rays.
MEDIUM
A major characteristic of the monocot root is the presence of:
