Both vessels and companion cells are absent in
[D] both (b) and (c)
The only plant cells without nuclei among the following are
[A] cambium cells
[B] cells of pericycle
[C] xylem parenchyma
[D] sieve tubes
Vessels differ from tracheids
[A] in being derived from single cell
[B] in having vertical rows of cells with cross walls dissolved
[C] in being alive
[D] in helping in the conduction of water
Companion cells are usually seen associated with
[D] sieve tubes
Sieve tubes are better-suited for translocation because they
[A] possess broader lumen and perforated cross walls
[B] are broader than long
[C] possess bordered pits
[D] possess no end walls
Lignified cell wall is the characteristic feature of
[A] phloem cells
[B] epidermal cells
[C] cambial cells
[D] xylem cells
The chief function of sieve tube is
[A] to translocate the organic materials manufactured in the leaves
[B] to conduct minerals
[C] to transport water from root to leaves
[D] to help the plant in forming wood
Function of storage is performed by
Which is present in the vascular bundles of gymnosperms?
[C] Companion cells
How many types of tissue systems are present in plant depending on their structure and function?
Tissue system include
[A] epidermal tissue system
[B] ground tissue system or fundamental tissue system
[C] vascular tissue system
Epidermal tissue system is made up of
[A] epidermal cells
[C] epidermal appendages
Which of the following is epidermal appendage?
[B] Guard cell
[D] Subsidiary cell
Select T/F (True/False).
(a) Epidermis is usually single-layered.
(b) Epidermal cells are parenchymatous cell with abundant cytoplasm.
(c) Vessel members of xylem are interconnected through perforation in their common walls.
(d) Sclerenchyma provides mechanical support to organs.
The epidermis is generally covered with a waxy thick layer called the ______ which prevents the loss of water,