The specific arrangement of sieve elements and companion cells in phloem tissue, where a single companion cell is associated with multiple sieve elements, is MOST characteristic of which plant group?
Angiosperms
Gymnosperms
Bryophytes
Pteridophytes
Related Questions
The sieve plates in phloem are involved in:
Preventing backflow of phloem sap
Storing food materials
Maintaining continuous flow of phloem sap
Absorbing water from xylem
Which of the following cells are studied during translocation of solutes?
Sieve tube cells
Companion cells
Phloem fibre
Xylem fibre
Which of the following is an incorrect statement?
The perinuclear space forms a barrier between the materials present inside the nucleus and that of the cytoplasm
Nuclear pores acts as passages for proteins and RNA molecules in both directions between nucleus and cytoplasm
Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles
Microbodies are present both in plant and animal cells
The cells without nuclei are present in
Vascular cambium
Root hair
Companion cell
Members of sieve tube
The term leptome is used for
Xylem
Phloem
Endodermis
Pericycle
Which of the following statements are true?
I.Uneven thickening of cell well is characteristic of sclerenchyma.
II.Periblem forms the cortex of the stem and the root.
III.Tracheids are the chief water transporting elements in gymnosperms.
IV.Companion cell is devoid of nucleus at maturity.
V.The commercial cork is obtained from Quercus suber.
I and IV
II and V
III and IV
II, III and V
Which cell type, responsible for assisting in the conduction of nutrients in angiosperm phloem, is absent in gymnosperms?
Sieve cells
Companion cells
Albuminous cells
Phloem fibers
A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?
Absence of sugar
Acidic
Alkaline
Low refractive index
The main conducting cells of the phloem are:
Sieve tube elements
Tracheids
Vessels
Companion cells
Which of the following is NOT transported by the phloem?
Sucrose
Amino acids
Hormones
Water and minerals
