Xylem and Phloem Questions

Annual rings in a tree signify the age of the tree. What are these annual rings made of?
(a) Growing secondary phloem
(b) Growing secondary xylem
(c) Growing primary phloem
(d) Growing primary xylem

Ans. (b)

Loading of phloem means
(a) Elongation of phloem cells
(b) Separation of phloem parenchyma
(c) Strengthening of phloem fibers
(d) Pouring sugar into phloem

Ans. (d)

Ascent of sap takes place through
(a) Xylem fibres
(b) Xylem parenchyma
(c) Xylem vessels
(d) None

Ans. (c)

The phloem of gymnosperms differ from angiosperms in
(a) Having phloem fibre
(b) Having phloem parenchyma
(c) Having no companion cells
(d) Having parenchyma

Ans. (c)

In dicot stem, xylem is
(a) Polyarch
(b) Endarch
(c) Exarch
(d) Mesarch

Ans. (b)

Living complex tissue
(a) Xylem
(b) Phloem
(c) Both
(d) None

Ans. (b)

Anamphiphloic siphonostele is a stele in which
(a) Phloem is present on the inner side of xylem only
(b) Phloem is present on both outer and inner side of the xylem in tubular stele
(c) Phloem is in the centre and surrounded by the xylem
(d) Phloem is present on the outer side of xylem only

Ans. (b)

Nematocysts are present in which of the following phylum?
(a) Coelenterata
(b) Porifera
(c) Nemanthelmanthis
(d) Echinodermata

Ans. (a)

The lowest water potential in the xylem are in the
(a) Root hair
(b) Vascular cylinders of roots
(c) Leaves
(d) Tracheids of stem

Ans. (c)

The part of the plant which is responsible for carrying water and solutes from roots to various parts of plants is:
(a) Phloem
(b) Xylem
(c) Duodenum
(d) Sclercids

Ans. (b)

Uptake of mineral ions into the xylem is controlled by
(a) Epidermal cells
(b) Cortex cells
(c) Endodermal cells
(d) Xylem cells

Ans. (c)

Food is transported to different parts of the plant through
(a) Xylem
(b) Phloem
(c) Pith
(d) Cortex

Ans. (b)