Anatomy of Flowering Plants: Class 11 Biology Q&A · Page 2
32 free answers on Anatomy of Flowering Plants (Biology) for Class 11 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- BiologyClass 11All
Discuss epidermal tissue system in detail.
Solution: The epidermal tissue system forms the outermost protective layer of the primary plant body, comprising: Epidermis Stomata Epidermal Appendages (Trichomes and Root Hairs) EPIDERMIS: Structural Characteristics: Usually single-layered (except in some x
- BiologyClass 11All
Write a descriptive note on phloem and its elements in angiosperms.
Phloem is a complex permanent tissue responsible for translocation of organic nutrients (primarily sucrose) from sources (leaves) to sinks (roots, fruits, storage organs). Components of Angiosperm Phloem: Phloem comprises four types of elements: Sieve Tube Elements Companion Cells Phl
- BiologyClass 11All
Differentiate between collenchyma and sclerenchyma.
Both collenchyma and sclerenchyma are simple permanent tissues providing mechanical support, but differ significantly in structure and function. Feature Collenchyma Sclerenchyma 1. Cellular State<
- BiologyClass 11All
Define periderm.
Periderm is the secondary protective tissue that replaces the epidermis in stems and roots undergoing secondary growth. Comprehensive Definition: Periderm is a complex tissue formed during secondary growth, comprising three components: Phellogen (Cork Cambium) - Meristematic layer Phellem (Cork) - Oute
- BiologyClass 11All
Why are annual rings formed in the flowering plants of temperate regions?
Annual rings (also called growth rings) are concentric circular bands visible in the cross-section of woody stems, formed due to seasonal activity of vascular cambium. Mechanism of Formation: Temperate Climate Characteristics: Distinct seasons: Spring (warm, wet) → Summer → Autumn → Winter (cold, dry) Seasonal ca
- BiologyClass 11All
What do you understand by secondary medullary rays?
Secondary medullary rays (also called vascular rays or xylem/phloem rays) are radially oriented parenchymatous bands that traverse through secondary vascular tissues. Formation: During secondary growth in dicot stems: Vascular cambium produces secondary xylem (inward) and secondary phloem (outward) At certain locations, cambia
- BiologyClass 11All
Differentiate between primary and secondary growth of plants.
Aspect Primary Growth Secondary Growth Definition Increase in length of roots and stems Increase in girth/diameter of roots and stems <td
- BiologyClass 11All
What are bulliform cells? What role do they play?
Bulliform cells (also called motor cells) are large, specialized epidermal cells found in grass leaves (monocots). Location: Present on the adaxial (upper) epidermis Arranged in groups in the valleys between veins Often aligned along the longitudinal axis of the leaf Structura
- BiologyClass 11All
Which tissue in leaves performs photosynthesis?
esophyll is the primary photosynthetic tissue in leaves. Definition: Mesophyll is the ground tissue present between the upper (adaxial) and lower (abaxial) epidermis. Structural Features: Composed of chlorophyll-rich parenchyma cells (chlorenchyma) Cells contain numerous chloroplasts
- BiologyClass 11All
Comment upon the pericycle present in stems and roots of angiosperms.
Pericycle is a component of the ground tissue system, located inner to the endodermis. Comparative Analysis: Plant Part Pericycle Characteristics Dicot Root • Parenchymatous cells</st
- BiologyClass 11All
Give two differences between the internal structure of dicot and monocot stem w.r.t. hypodermis and vascular bundle.
olution: Character Dicotyledonous Stem Monocotyledonous Stem 1. Hypodermis Composed of collenchymatous cells (thin-walled, with angular thickening at corners)
- BiologyClass 11All
Why is endodermis also called the starch sheath in dicot stem?
abundantly filled with starch grains. Structural Features: Endodermis in Dicot Stems: Innermost layer of cortex (boundary between cortex and stele) Single-layered, barrel-shaped cells No intercellular spaces (compactly arranged) Living cells with prominent nucleus Rich in starch grains (am