Explain the primary root growth, Biology

Assignment Help:

Explain the Primary Root Growth?

Primary Growth in Roots :  Roots grow down and through the soil by adding new cells at the tip of the root (called the root tip). There is a group of cells called the apical meristem at the tip that actively divide by mitotic division to produce new cells to the inside of the root that will ultimately become the procambium, the ground meristem, and the protoderm. The apical meristem also cuts off cells to the outside of the root, which form a protective root cap. The root cap forms a protective barrier to shield the delicate meristematic tissue from the abrasive soil, sand and rocks through which the root must grow. The root cap even produces a polysaccharide jelly to lubricate the root as it glides through the soil.

1914_Primary Growth in Roots.png

There are 3 separate tissue regions that make up the root tip: the cells that undergo cell division, or the apical meristem tissues, are called the region of cell division; the area above the dividing cells in which the newly formed cells elongate, is referred to as the region of elongation; and the zone above that is called the region of maturation, where the cells develop ("differentiate") and become fully mature and functional.

The middle of the region of cell division is actually composed of cells that divide at a slower rate, and are therefore referred to as the "quiescent center." Cells that are produced in a direction towards the tip or front of the root form the root cap. As you might expect, the outer cells of the root cap get worn away and therefore require continual replacement by the apical meristem.


Related Discussions:- Explain the primary root growth

Animal classification, Explain metachrosis in frogs? How it is different fr...

Explain metachrosis in frogs? How it is different from change of skin colour of chemleon?

Orthopedics, 1. List alternative therapies for musculoskeletal problems. ...

1. List alternative therapies for musculoskeletal problems. 2. What is a xyrospasm? What is the Greek derivative of the word? 3. Name and describe the three types of varus con

Can you explain plasmids, Q. What are plasmids? And what is the significanc...

Q. What are plasmids? And what is the significance of plasmids for the recombinant DNA technology? Plasmids are circular fragments of DNA that are accessories to the main bacte

Seed dormancy - plant growth substances, Seed Dormancy - Plant Growth Subst...

Seed Dormancy - Plant Growth Substances Seed dormancy is critically important for the survival of plants. Factors involved in seed dormancy are: A. Environmental Factors

Voluntary movements of the big toe of the right foot, Which of the followin...

Which of the following is true for a toe corticospinal interneuron that produces action potentials during voluntary movements of the big toe of the right foot? A. Its dendrites

Diversity in living organisms, which organism are called primitive and how ...

which organism are called primitive and how are they different from the so-called adavnced organisms

Write an account on coenzymes, Question 1 Describe in detail the immunopro...

Question 1 Describe in detail the immunoprophylaxis Question 2 Give a detailed account on autoimmune diseases Question 3 Describe the classification and properties of an

Determine about the psychological tests, Determine about the Psychological ...

Determine about the Psychological tests The construct of attention has been found to comprise several interrelated elements that the paediatric neuropsychologist can consider i

What is the bio-medical waste, What is the Bio-medical waste The Bio-m...

What is the Bio-medical waste The Bio-medical waste (Management & Handling Rules), 1998 is applicable to all persons, who generate, collect, receive, store, transport, treat,

What are the parts of nervous system, What are the parts of Nervous system ...

What are the parts of Nervous system Nervous system is divided into three main parts: 1) The brain and spinal cord or Central Nervous System (CNS). 2) The nerves or Peri

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd