Class Mammalia | Class 11 Biology New Book | Chapter 1 | Lecture 19 | New Syllabus 2025

Описание: 📘 Welcome to SmartPath Academy – Your trusted guide for Class 11 Biology Punjab Board 2025.

🦘 In this lecture, we cover Class Mammalia (Mammals) in detail, including their origin, characteristics, organ systems, reproduction, and sub-classes with examples.

🎯 Key Topics Covered:
✅ Classification of Vertebrates – Class Mammalia
✅ Origin: Term given by Linnaeus
Nourished by mammary glands
Body covered with hairs
✅ Habitat: Present in land, freshwater, and sea
✅ Glands:
Sebaceous (oil) – lubricates and waterproofs skin
Sudoriferous (sweat) – evaporative cooling
Mammary gland – female nourishment function
✅ Teeth & Jaws: 2 sets (milk teeth & permanent teeth)
✅ External Ear: pinna, middle ear (tube-like), 3 bones (incus, malleus, stapes)
✅ Circulatory System: 4-chambered heart (2 atria, 2 ventricles)
✅ Warm-blooded – regulate body temperature
✅ Respiratory System:
Larynx (voice box well-developed)
Diaphragm separates thoracic & abdominal cavities
✅ Reproduction:
Internal fertilization
Oviparous (egg-laying mammals)
Viviparous (placental & pouched mammals)

🔹 Sub-Classes of Mammals
1️⃣ Prototheria – Egg-laying mammals (Duckbill Platypus)
2️⃣ Metatheria – Marsupials with abdominal pouch (Kangaroo, Tasmanian wolf)
3️⃣ Eutheria – Most advanced, placental mammals (Man, Whale, Elephant, Bat, Tiger, Cat, etc.)

📚 Aligned with Punjab Board Class 11 Biology 2025 Syllabus

🎬 Watch Related Lectures:
👉 Chapter 01 Playlist:    • Three Domain Classification System | Domai...  

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