__________ are made up of sclerenchymatous cells. These are generally absent in the primary phloem but are found in the secondary phloem.
Phloem fibres
Phloem fibres are elongated sclerenchymatous cells with thick, lignified walls that provide mechanical support to phloem tissue. They are generally absent (or scarce) in primary phloem but are commonly present in secondary phloem, contributing to the bark. Commercial fibres like jute, flax and hemp are obtained from phloem fibres.
Xylem fibres/parenchyma belong to xylem, and phloem parenchyma is parenchymatous (not sclerenchymatous). Hence the answer is Phloem fibres.
Similar Questions
What happens to the guard cells when water flows into them?
Select the correct option about Kwashiorkor.
Statement A: It is a form of malnutrition caused by a lack of fat in the diet.
Statement B: Children who develop Kwashiorkor may not grow or develop properly and may remain stunted for the rest of their lives.
Match the columns.
Column-A
(Enzyme/Protein)
Column-B
(Role in DNA replication)
i.
Helicase
a.
Joins the 3' end of the new DNA fragment to the 5' end of the previous one
ii.
RNA primase
b.
Nucleotide polymerisation
iii.
DNA polymerase
c.
RNA primer synthesis
iv.
DNA ligase
d.
Opens up the DNA double helix
Which cells, also called neurilemma cells, are the main glial cells in the PNS and play an essential role in the survival and functions of neurons?
Which of the following statements is FALSE?
Match the columns.
Nutrients
Examples
a.
Protein
1.
Calcium, Phosphorous
b.
Carbohydrates
2.
Cholesterol
c.
Fat
3.
Glucose
d.
Minerals
4.
Myosin
Which among the following is a non-biodegradable waste?
The study of insects is called ______.
________ is the branch of zoology concerned with the study of amphibians.
Who discovered cells in the human body?
Important Questions from Biology
Tooth decay starts when the pH of our mouth is_______.
Which hormone is secreted by the pituitary gland?
Mushrooms and other microorganisms feed on dead plant and animal tissues and convert them into ______
Gregor Johann Mendel came up with the theory of inheritance by studying:
Red algae are generally found in:
