Browse by Stream
-
Engineering and Architecture
Exams
Colleges
Predictors
Resources
-
Computer Application and IT
Quick Links
Colleges
-
Pharmacy
Colleges
Resources
-
Hospitality and Tourism
Colleges
Resources
Diploma Colleges
-
Competition
Other Exams
Resources
-
School
Exams
Top Schools
Products & Resources
-
Study Abroad
Top Countries
Student Visas
-
Arts, Commerce & Sciences
Exams
Colleges
Upcoming Events
Resources
-
Management and Business Administration
Colleges & Courses
Predictors
-
Learn
Online Courses
Engineering Preparation
Medical Preparation
-
Online Courses and Certifications
Top Streams
Specializations
- Digital Marketing Certification Courses
- Cyber Security Certification Courses
- Artificial Intelligence Certification Courses
- Business Analytics Certification Courses
- Data Science Certification Courses
- Cloud Computing Certification Courses
- Machine Learning Certification Courses
- View All Certification Courses
Resources
-
Medicine and Allied Sciences
Colleges
Predictors
Resources
-
Law
Resources
Colleges
-
Animation and Design
Predictors & Articles
Colleges
Resources
-
Media, Mass Communication and Journalism
Colleges
Resources
-
Finance & Accounts
Top Courses & Careers
Colleges
Get Answers to all your Questions
- #Class 11
- #Medical
- #Biology
- #National Eligilibility Cum Entrance Test
- #Structural Organisation in Animals and Plants
- #National Eligibility Cum Entrance Test
The cork cambium, cork and secondary cortex are collectively called:
Option: 1
Phelloderm
Option: 2
Phellogen
Option: 3
Periderm
Option: 4
Plerome
Answers (1)
- The continuous secondary growth in the intrastelar region adds more and more secondary xylem and secondary phloem.
- This exerts pressure on the tissues lying towards the outer side, that is, cortex and epidermis.
- The epidermis ruptures due to the exertion of the pressure and the underlying tissues are exposed to the environment.
- At this stage, a secondary tissue called periderm develops.
- Periderm develops through the activity of cork cambium or phellogen.
- Cork cambium or phellogen is the secondary meristem that develops generally from the collenchymatous cells of hypodermis, sometimes from the cells of the epidermis (apple), pericycle (Cimatis), phloem (vitis).
- Phellogen gives rise to cork or phellem on the outer side and secondary cortex of phelloderm on the inner side.
- Phellem or cork is the dead tissue with suberised cell walls. It is impermeable to water and is used commercially.
- Quercus suber is commercial cork.
- Secondary cortex or phelloderm is living tissue. It stores food and replaces the damaged primary cortex.
- Phellem, phellogen and phelloderm are called periderm.
- Periderm and fragments of epidermis form the protective tissues in an old dicot stem.
Phellogen, phellem and phelloderm are collectively known as periderm.
View full answer
NEET 2024 Most scoring concepts
- Just Study 32% of the NEET syllabus and Score up to 100% marks
