Identify the xylem element.
A) Trachieds
B) Sieve cells
C) Sieve tubes
D) Companion cells
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i) All living organisms are composed of cells and products of cells, ii) All cells arise from preexisting cells.
C) Cell theory
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Gum is secreted by A) Dermal layer B) Meristematic cells C) Xylem D) Phloem
A) Dermal layer
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Identify the vascular tissues. A) Xylem B) Phloem
C) Both xylem and phloem
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Identify the xylem element. A) Trachieds B) Sieve cells C) Sieve tubes D) Companion cells
(A)Trachieds Xylem elements are - Trachieds, vessels, xylem fibre and xylem parenchyma
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Identify the phloem element. A) Trachieds B) Vessels
C) Sieve cells
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Cell walls of xylem cells are thick because A) Suberin B) Peetin
Correct option is D) Lignin
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Sieve tubes and companion cells can be seen in
Correct option is C) Phloem
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Death of companion cell causes death of sieve tube cells and vice versa. Justify.
Companion cells: a. These are narrow elongated and living. b. Companion cells are laterally associated with sieve tube elements. c. Companion cells have dense cytoplasm and prominent nucleus. d. Nucleus of companion cell regulates...
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The sieve tube cell is connected to companion cell through phloem parenchyma by
(A) Plasmodesmata
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i. Identify the element that exhibits only negative oxidation state. ii. Identify the element that exhibits only positive oxidation state.
i. F: It is most electronegative. It shows only a negative oxidation state of -1. ii. Cs: Alkali metals have only one electron in their valence shell and hence, exhibits only positive...
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