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Q5:
What is the difference between direct and indirect development?
Solution :
1. Definitions and Theoretical Foundation
Development in animals refers to the process of transforming a zygote into a mature adult organism. This process is categorized based on the presence or absence of an intermediate larval stage, which significantly alters the ecological niche and morphological trajectory of the organism [Per Principles of Developmental Biology].
2. Comparative Analysis of Developmental Pathways
| Feature | Direct Development | Indirect Development |
|---|---|---|
| Larval Stage | Absent. | Present; one or more larval stages exist. |
| Morphology at Birth | Young resemble the adult miniature. | Young (larva) differ significantly from adult. |
| Metamorphosis | Not required. | Required (Involves physiological and structural reorganization). |
| Example Organisms | Humans ($Homo\ sapiens$), Birds. | Frogs ($Rana\ tigrina$), Butterflies. |
3. Visual Representation of Developmental Trajectories
4. Mechanistic Justification
- Direct Development: The embryo matures within the egg or uterus, bypassing the free-living larval stage. This is an energy-intensive process for the parent, as the offspring is born with developed organ systems [By Embryological Maturation Principle].
- Indirect Development: The organism hatches as a larva, which is functionally distinct from the adult. This allows the larva to exploit different food resources than the adult, reducing intra-specific competition [By Ecological Niche Theory]. The transition to adulthood requires metamorphosis, a biological process involving conspicuous and abrupt changes in the animal's body structure through cell growth and differentiation.
Final Solution: Direct development involves a growth phase where the offspring emerges as a miniature version of the adult without larval stages, whereas indirect development involves a distinct larval stage that must undergo metamorphosis to reach the mature adult form.
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?
- 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.
- Q10: How important is the presence of air bladder in Pisces?
- 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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