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NCERT Solutions Class 11 Biology Chapter 6 - Anatomy of Flowering Plants
NCERT Solutions for Class 11 Biology Chapter 6 (Anatomy of Flowering Plants) explore the internal structural organization of plants. While Morphology (Chapter 5) deals with external forms, Anatomy focuses on the functional organization of tissues and how they work together to sustain life. Understanding the internal "machinery" of plants is essential for grasping how they transport water, store food, and grow in thickness.
NCERT Solutions for Class 11 Biology Chapter 6 by ALLEN are meticulously designed by expert faculty to clarify the microscopic world of plants. The solutions focus on the structural differences between Monocot and Dicot organs and the fascinating process of Secondary Growth, which allows trees to form wood and increase their girth. For NEET aspirants, this chapter is a cornerstone of Plant Biology. Questions frequently focus on identifying tissues from cross-sectional descriptions or understanding the role of the vascular cambium. These solutions provide the conceptual precision needed to master complex topics like the activity of the cambial ring and the formation of heartwood vs. sapwood.
1.0Class 11 Biology Chapter 6 Anatomy of Flowering Plants: Key Concepts
This chapter examines the internal structure and functional organization of higher plants. The key lessons include:
- The Tissues: Understanding Meristematic tissues (Apical, Intercalary, and Lateral) and Permanent tissues (Parenchyma, Collenchyma, Sclerenchyma, Xylem, and Phloem).
- The Tissue System: Exploring the Epidermal, Ground, and Vascular tissue systems.
- Vascular Bundles: Learning the types of arrangements—Radial, Conjoint (Open and Closed).
- Anatomy of Dicot and Monocot Plants: Detailed comparison of the internal structures of roots, stems, and leaves (Dorsiventral and Isobilateral).
- Secondary Growth: Analyzing the activity of the Vascular Cambium and Cork Cambium in dicot stems and roots.
- Heartwood and Sapwood: Understanding the physiological differences and structural roles of different layers of wood.
- Spring Wood and Autumn Wood: Explaining the formation of Annual Rings and their significance in dendrochronology.
2.0NCERT Solutions Class 11 Biology Chapter 6 - Anatomy of Flowering Plants : Detailed Solutions
- Draw illustrations to bring out the anatomical difference between (a) Monocot root and dicot root (b) Monocot stem and dicot stem
Ans.
(a) Differences between monocot root and dicot root are illustrated in the following figure and table.
(b) Differences between monocot and dicot stems are illustrated in the following figure and table.
- Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or a dicot stem ? Give reasons. Ans.
- Vascular bundles in dicot stem are arranged in a ring whereas in monocot stem vascular bundles are scattered throughout the ground tissue.
- On the basis of arrangement of vascular bundles it can be ascertained whether the young stem is dicot or monocot. Besides undifferentiated ground tissue, sclerenchymatous hypodermis, oval or circular vascular bundles with Y shaped xylem are other differentiating features of monocot stem.
- The transverse section of a plant material shows the following anatomical features (a) The vascular bundles are conjoint, scattered and surrounded by a sclerenchymatous bundle sheath, (b) Phloem parenchyma is absent. What will you identify it as?
Ans.
- The plant material is identified as a monocot stem.
- These are characteristic features of a monocot stem:
- Vascular bundles are conjoint, collateral and closed.
- They are scattered in the ground tissue.
Each vascular bundle is surrounded by a sclerenchymatous bundle sheath.
- Phloem parenchyma is absent. Example: Maize stem.
- What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.
Ans. Stomatal apparatus : The stomatal pore, guard cells and the surrounding subsidiary cells together constitute the stomatal apparatus. Structure of stomata : A typical stoma consists of :
- Stomatal pore
- Two guard cells
- Subsidiary cells
- The stomatal pore is surrounded by two guard cells.
- In grasses, the guard cells are dumb-bell shaped, whereas in dicots they are generally bean-shaped.
- The guard cells possess chloroplasts, whereas the other epidermal cells generally do not possess chloroplasts.
- The inner wall of the guard cell, towards the stomatal pore, is thick, while the outer wall is comparatively thin. The stomata are involved in the exchange of gases and transpiration.
- Name the three basic tissue systems in the flowering plants. Give the tissue names under each system. Ans. The three basic tissue systems in flowering plants are (1) Epidermal tissue system (2) Ground tissue system (3) Vascular tissue system (1) Epidermal tissue system comprises epidermal cells, stomata, trichomes and hairs. (2) Ground tissue system consists of cortex, endodermis, pericycle, pith and medullary rays, in the primary roots and stems. In leaves, the ground tissue consists of thin walled chloroplast containing cells and is called mesophyll. (3) The vascular tissue system consists of complex tissues, the phloem and the xylem.
- How is the study of plant anatomy useful to us?
Ans. The study of plant anatomy is useful because:
- It helps us understand the internal structure and organisation of plants.
- It helps in the identification and classification of plants.
- It helps us understand the functions of different tissues.
- It helps in understanding the growth and development of plants.
- Knowledge of plant anatomy is useful in understanding secondary growth and formation of wood.
- It provides knowledge about the structural adaptations of plants.
- It has applications in agriculture, forestry and plant sciences.
- Describe the internal structure of a dorsiventral leaf with the help of labelled diagram.
Ans.
Dorsiventral leaves are found in dicots. The important anatomical features of dorsiventral leaves are discussed below:
(a) Upper epidermis : This is generally outermost single layer made of parenchymatous cells. The epidermal cells have sometimes outgrowths called papillae, e.g., in Gladiolus. The epidermal cells are devoid of chloroplast and stomata are absent on upper epidermis. (b) Lower epidermis : It is just like upper epidermis but here stomata are present. Chloroplasts are absent in lower epidermis also, except the guard cells of stomata. (c) Mesophyll : In between upper and lower epidermis mesophyll tissue is present which can be divided into two regions: (i) Palisade parenchyma : These are elongated columnar cells without intercellular spaces. These have chloroplast in them and are generally arranged in two layers. (ii) Spongy parenchyma : It is found below palisade parenchyma and are spherical or oval with intercellular spaces. They also have chloroplasts but number of chloroplasts is more in palisade parenchyma than spongy parenchyma. (d) Vascular bundles : Vascular bundles are. generally found at the boundary between the palisade and the spongy regions. The vascular bundle in midrib region is largest. Vascular bundles are conjoint, collateral and closed. Each vascular bundle is surrounded by a bundle sheath of parenchymatous cells. In the vascular bundle, xylem is present towards upper epidermis and phloem towards lower epidermis. Further in xylem, protoxylem is towards upper epidermis.
3.0Key Features of NCERT Solutions for Class 11 Biology Chapter 6
- Comparative Anatomy Focus: The solutions provide clear, side-by-side comparisons of Monocot and Dicot structures, which is the most frequent area for exam questions.
- Microscopic Detail Clarity: Expert explanations on the functions of specialized cells like Bulliform cells in monocot leaves or Companion cells in phloem.
- Secondary Growth Logic: Step-by-step breakdown of how the cambial ring becomes active and why secondary growth is absent in monocots, a crucial concept for NEET.
- Technical Accuracy: Detailed descriptions of "Endarch" and "Exarch" conditions of xylem, ensuring students understand the orientation of primary tissues.
- Prepared by Expert Faculty: Prepared by ALLEN subject experts, these solutions ensure biological accuracy and strict alignment with the latest NCERT/NEET syllabus.
- Diagram-Oriented Learning: The solutions emphasize interpreting T.S. (Transverse Section) diagrams, which helps students visualize the spatial arrangement of tissues.