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Q10:
How important is the presence of air bladder in Pisces?
Solution :
Biological & Physiological Significance of the Air Bladder (Swim Bladder)
The air bladder, also known as the swim bladder or gas bladder, is a specialized internal gas-filled organ found in many actinopterygian (bony) fishes. Its primary function is the regulation of buoyancy [per the principles of Hydrostatic Equilibrium].
Step 1: Mechanism of Hydrostatic Regulation
The air bladder allows the fish to maintain its depth without expending significant energy on active swimming. By modulating the volume of gas (primarily oxygen, nitrogen, and carbon dioxide) within the bladder, the fish alters its overall body density [Ref: Archimedes' Principle].
- Increasing Buoyancy: By secreting gas into the bladder (via the rete mirabile), the fish increases its volume, displacing more water, thereby increasing the buoyant force.
- Decreasing Buoyancy: By resorbing gas (via the oval window), the fish decreases its volume, reducing buoyant force and allowing for descent.
Step 2: Comparative Anatomical Classification
| Type | Description | Example |
|---|---|---|
| Physostomous | Retain a connection to the esophagus (pneumatic duct); swallow air to fill the bladder. | Salmon, Herring |
| Physoclistous | Connection to the esophagus is closed; gas is exchanged via blood diffusion. | Perch, Bass |
Step 3: Secondary Physiological Roles
Beyond buoyancy, the air bladder serves several critical secondary functions:
- Sound Production: Many species use the bladder as a resonating chamber to produce drumming or clicking sounds for communication [Bio-acoustics].
- Sound Perception: In some groups (e.g., Ostariophysi), the air bladder is connected to the inner ear via the Weberian apparatus, significantly enhancing auditory sensitivity.
- Respiration: In certain specialized environments (e.g., hypoxic waters), the air bladder can act as an accessory respiratory organ, allowing the fish to extract oxygen from swallowed air.
Technical Schematic: The Mechanism of Buoyancy
Step 4: Evolutionary Significance
The presence of the air bladder is a defining characteristic that allowed bony fishes to diversify into various aquatic niches, from pelagic zones to stagnant, low-oxygen benthic environments. It serves as a metabolic economy, reducing the energetic cost of vertical migration [Evolutionary Adaptation Theory].
Final Solution: The air bladder is of paramount importance in Pisces as a hydrostatic organ that regulates buoyancy, enabling fish to maintain specific depths with minimal muscular effort. Additionally, it facilitates sound production, sound reception, and in some species, serves as an auxiliary respiratory surface.
More Questions from Class 11 Biology Animal Kingdom EXERCISES
- Q1: What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
- Q2: If you are given a specimen, what are the steps that you would follow to classify it?
- Q3: How useful is the study of the nature of body cavity and coelom in the classification of animals?
- Q4: Distinguish between intracellular and extracellular digestion?
- Q5: What is the difference between direct and indirect development?
- Q6: What are the peculiar features that you find in parasitic platyhelminthes?
- Q7: What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
- Q8: Water vascular system is the characteristic of which group of the following:
- Q9: “All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.
- Q11: What are the modifications that are observed in birds that help them fly?
- Q12: Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?
- Q13: Segmentation in the body is first observed in which of the following:
- Q14: Match the following: (a) Operculum (i) Ctenophora (b) Parapodia (ii) Mollusca (c) Scales (iii) Porifera (d) Comb plates (iv) Reptilia (e) Radula (v) Annelida (f) Hairs (vi) Cyclostomata and Chondrichthyes (g) Choanocytes (vii) Mammalia (h) Gill slits (viii) Osteichthyes
- Q15: Prepare a list of some animals that are found parasitic on human beings.
CBSE Solutions for Class 11 Biology Animal Kingdom
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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