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Post a LessonAnswered on 09 Apr Learn CBSE/Class 11/Science/Biology/Unit 2: Structural Organisation in Animals and Plants/Chapter 6- Anatomy of Flowering Plants
Sadika
Meristems are regions of plant tissue composed of actively dividing cells. They are responsible for the growth and development of plants. There are three main types of meristems in plants, each located in specific regions and serving distinct functions:
Apical Meristem:
Lateral (or Cambial) Meristem:
Intercalary Meristem:
These different types of meristems work together to ensure the growth, development, and adaptation of plants to their environment. They play crucial roles in primary and secondary growth, tissue differentiation, and the formation of new organs and structures throughout the life cycle of plants.
Answered on 09 Apr Learn CBSE/Class 11/Science/Biology/Unit 2: Structural Organisation in Animals and Plants/Chapter 6- Anatomy of Flowering Plants
Sadika
Yes, I agree with the statement that cork cambium forms tissues that form the cork. Cork cambium, also known as phellogen, is a type of lateral meristem found in the bark of woody stems and roots of certain plants. It is responsible for the production of cork cells (phellem) that constitute the outer protective layer of the stem or root, known as the cork or periderm.
Cork cambium is a layer of meristematic tissue that arises from the activity of the vascular cambium or the phloem parenchyma cells. As the cork cambium undergoes cell division, it produces new cells towards both the outer and inner sides. The cells produced towards the outer side differentiate into cork cells, while those produced towards the inner side differentiate into phelloderm cells, which are part of the secondary cortex.
The cork cells produced by the cork cambium are dead at maturity and have several specialized features that make them suitable for their protective function. Cork cells are filled with suberin, a waxy substance that makes them impermeable to water and gases, providing a barrier against desiccation, pathogens, and mechanical damage. Additionally, cork cells have thick cell walls and are arranged in layers, forming a durable and protective outer covering for the plant.
Overall, cork cambium plays a crucial role in the formation of cork tissues, which serve as a protective barrier for the underlying tissues of woody stems and roots. Without the activity of cork cambium, plants would be more susceptible to damage from environmental stresses, pathogens, and physical injuries. Therefore, it is accurate to say that cork cambium forms tissues that form the cork.
Answered on 09 Apr Learn CBSE/Class 11/Science/Biology/Unit 2: Structural Organisation in Animals and Plants/Chapter 6- Anatomy of Flowering Plants
Sadika
Secondary growth in the stems of woody angiosperms occurs due to the activity of two lateral meristems: the vascular cambium and the cork cambium (phellogen). These meristems add layers of secondary tissues, resulting in an increase in girth or diameter of the stem. Here's an explanation of the process of secondary growth along with schematic diagrams illustrating the key steps:
Process of Secondary Growth:
Vascular Cambium Activity:
Cork Cambium Activity:
Schematic Diagrams:
Annual Rings Formation
_______________________________________
| |
| Secondary Phloem (Bark) |
|______________________________________|
| |
| Secondary Xylem (Wood) |
|______________________________________|
| Vascular Cambium (Meristem) |
|______________________________________|
| Primary Phloem (Old Bark) |
|______________________________________|
| Primary Xylem (Old Wood) |
|______________________________________|
| Pith (Central Region) |
|______________________________________|
Cork Cambium Activity
_______________________________________
| |
| Cork (Phellem) |
|______________________________________|
| Cork Cambium |
|______________________________________|
| Phelloderm |
|______________________________________|
| Secondary Phloem |
|______________________________________|
| Secondary Xylem |
|______________________________________|
| Primary Phloem (Old Bark) |
|______________________________________|
| Primary Xylem (Old Wood) |
|______________________________________|
| Pith (Central Region) |
|______________________________________|
Significance of Secondary Growth:
Answered on 09 Apr Learn CBSE/Class 11/Science/Biology/Unit 2: Structural Organisation in Animals and Plants/Chapter 6- Anatomy of Flowering Plants
Sadika
Below are simplified illustrations highlighting the anatomical differences between a monocot root and a dicot root:
___________________
/ \
| Epidermis |
|___________________|
| |
| Cortex Region |
|___________________|
| |
| Endodermis |
|___________________|
| |
| Pericycle |
|___________________|
| |
| Vascular Bundles |
|___________________|
| |
| Pith (Parenchyma)|
|___________________|
Dicot Root Anatomy:
___________________
/ \
| Epidermis |
|___________________|
| |
| Cortex Region |
|___________________|
| |
| Endodermis |
|___________________|
| |
| Pericycle |
|___________________|
| |
| Vascular Bundle |
|___________________|
| |
| Pith (Parenchyma)|
|___________________|
Anatomical Differences:
Vascular Bundle Arrangement:
Pith Presence:
Cortex Thickness:
Endodermis and Pericycle:
Epidermis:
Answered on 09 Apr Learn CBSE/Class 11/Science/Biology/Unit 2: Structural Organisation in Animals and Plants/Chapter 6- Anatomy of Flowering Plants
Sadika
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