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
Important Questions on Histology and Anatomy of Flowering Plants
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 |
(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.
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
Assertion The peripheral region of the secondary xylem is lighter in colour and is known as the sapwood (alburnum).
Reason It is involved in the conduction of water and minerals from root to leaf.
The correct answer is:
Which of the following are the part of the Periderm?
I. Duramen
II. Phellogen
III. Phellem
IV. Phelloderm
V. Alburnum
The correct answer is
Match the following lists
| List I | List II | List III |
| A) Lignified walled dead cells | i) Plants are less active | I) Secondary growth of root |
| B) During unfavourable seasons | ii) Pericycle above protoxylem | II) Medullary ray |
| C) Cambium farming narrow band of parenchyma | iii) Does not conduct water | III) Less number of xylem |
| D) Cambium forms below phloem | iv) Between secondary xylem and phloem | IV) Heart wood |
The correct match is:
Reason (R): The secondary xylem is produced more than the secondary phloem.
The correct option among the following is:
A) Periderm consists of phellogen, phellem and phelloderm
B) Permanent tissue having many different types of cells is called complex tissue
C) In stem, endodermis stores starch grains
D) Heartwood and sapwood produced in a year have same colour and density
