Question:
The older resin clogged secondary xylem in the central part of the tree trunk and the younger outer secondary xylem which conducts water are __ and __ respectively.
The older resin clogged secondary xylem in the central part of the tree trunk and the younger outer secondary xylem which conducts water are __ and __ respectively.
Updated On: Jun 21, 2022
- duramen and alburnum
- alburnum and duramen
- autumn wood and spring wood
- spring wood and autumn wood
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
In perennial woody trees, the central portion of stem is darker in colour: Further, it is hard and tough due to deposition of resins, tannins, gums and formation of tyloses. This central hard tough, and darker region constitutes heart wood or duramen. The conduction function of heart wood stops due to formation of tyloses in vessels and hence heart wood is mechanical in fundtiori but does not function in water conduction. The outer or peripheral portion of the trunk is lighter incolour and soft which performs the functions of conduction of water and minerals and it is known as sap wood or alburnum.
Was this answer helpful?
0
0
Top Questions on Anatomy of Flowering Plants
- Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Late wood has fewer xylary elements with narrow vessels.
Reason R: Cambium is less active in winters.
In the light of the above statements, choose the correct answer from the options given below:- NEET (UG) - 2023
- Biology
- Anatomy of Flowering Plants
- Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem.
Reason R: Internode of the shoot gets condensed to produce different floral appendages laterally at successive node instead of leaves.
In the light of the above statements, choose the correct answer from the options given below:- NEET (UG) - 2023
- Biology
- Anatomy of Flowering Plants
- Given below are two statements:
Statement I: Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II: Exarch condition is the most Common feature of the root system.
In the light of the above statements, choose the correct answer from the options given below:- NEET (UG) - 2023
- Biology
- Anatomy of Flowering Plants
- The fatty acid synthesis is carried out in which part of the plant cell?
- CUET (PG) - 2023
- Botany
- Anatomy of Flowering Plants
- In CAM pathway, the stomata :
- CUET (PG) - 2023
- Botany
- Anatomy of Flowering Plants
View More Questions
Questions Asked in COMEDK UGET exam
- The decreasing order of stability of oxides of halogen is
- COMEDK UGET - 2015
- Group 17 Elements
- A $2\,kg$ mass lying on a table is displaced in the horizontal direction through $50\,cm$. The work done by the normal reaction will be
- COMEDK UGET - 2015
- work, energy and power
- The numbers of $ {H^+}$ ions present in 1 mL of a solution whose pH is 13
- COMEDK UGET - 2015
- Equilibrium
- A mixture of methylamine and dimethylamine is given to you. The reagents used to separate the components of the mixture are
- $\cot^{-1} (21) + \cot^{-1} (13) + \cot^{-1} (-8) =$
- COMEDK UGET - 2015
- Inverse Trigonometric Functions
View More Questions
Concepts Used:
Anatomy of Dicotyledonous and Monocotyledonous Plants
Dicot Root:
- Dicot plants have the taproot system.
- The outermost layer is called the epidermis. The epidermal cells sometimes project out which appear as the root hairs.
- The epidermis is followed by the multi-layered cortex, loosely made of the parenchyma cells with intercellular spaces.
- The inner layer of the cortex is called endodermis, which is tightly packed by the barrel shaped-cells.
- Endodermis is followed by pericycle, which are a few layers of thick-walled parenchyma cells.
- In dicots, the central pith is not distinct.
- There are two to four xylem and phloem.
- The xylem and phloem are remarked by a layer of parenchymatous cells known as conjunctive tissue.
Monocot Root:
Monocot roots do not show much difference in the anatomy from that of the dicot roots.
- Monocot plants possess an adventitious root system.
- As in the dicots, the epidermis forms the outermost layer, followed by cortex, pericycle, endodermis, vascular bundles (xylem and phloem) and pith (random order).
- Pith is conspicuous and large.
- The number of xylem in a monocot is six or more.
- Secondary growth is not seen in the monocot plants.