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

Class Mammalia

Mammals biology

Characteristics of mammals

Class 11 Biology mammals

Punjab Board Biology 2025

Mammary glands mammals

Prototheria Metatheria Eutheria

Placental mammals

Marsupials

Egg laying mammals

Respiratory system of mammals

Circulatory system mammals

FSc Biology mammals lecture

SmartPath Academy

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Автор: SmartPath Academy

Загружено: 2025-08-21

Просмотров: 386

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...  

👍 Like | 💬 Comment | 🔁 Share with classmates🔔 Subscribe to SmartPath Academy for complete Class 11 Biology coverage.

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

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