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BIOLOGY- REPRODUCTION IN ORGANISM Part 4

BIOLOGY- REPRODUCTION IN ORGANISM Part 4

https://www.gyanodhan.com/video/3B1.%20Class%2011%20and%2012%20IIT%20NEET/Biology/114.%20BIOLOGY-%20REPRODUCTION%20IN%20ORGANISM%20Part%204.mp4

Biology: Reproduction in Organisms – Part 4

Reproduction in Organisms

Reproduction is a biological process by which organisms produce their offspring. It ensures the continuity of species.

Part 4: Sexual Reproduction in Organisms

1. What is Sexual Reproduction?

Sexual reproduction involves the fusion of male and female gametes (sperm and egg) to form a zygote, which develops into a new organism.

2. Phases of Sexual Reproduction:

  1. Pre-fertilization Events:

    • Gametogenesis: Formation of male and female gametes.
      • Isogamy: Similar gametes (Algae).
      • Anisogamy: Dissimilar gametes (Humans).
    • Gamete Transfer: Transfer of gametes for fertilization.
  2. Fertilization (Syngamy):

    • External Fertilization: Fusion occurs outside the body (Fishes, Amphibians).
    • Internal Fertilization: Fusion occurs inside the body (Reptiles, Mammals).
  3. Post-fertilization Events:

    • Zygote Formation: Fusion of sperm and egg forms a zygote.
    • Embryogenesis: Development of the embryo from the zygote.

3. Types of Organisms Based on Reproduction:

4. Importance of Sexual Reproduction:

5. Examples of Sexual Reproduction:

 Quick Quiz:

  1. What is the difference between isogamy and anisogamy?
  2. Name one oviparous and one viviparous animal.
  3. Why is genetic variation important in sexual reproduction?

अगर आपको किसी और टॉपिक या डिटेल्स में जाना है तो बताइए!

BIOLOGY- REPRODUCTION IN ORGANISM Part 4

CHAPTER – How do Organisms Reproduce?

Reproduction-in-organisms.pdf

NCERT-Class-12-Biology.pdf

REPRODUCTION AND POPULATION CONTROL

Here is Part 4 of the Biology – Reproduction in Organisms chapter, based on NCERT Class 12 syllabus and general biology topics:


Biology – Reproduction in Organisms (Part 4)

Topic: Reproductive Structures and Events in Sexual Reproduction


1. Overview of Sexual Reproduction

Sexual reproduction involves the fusion of male and female gametes (haploid) to form a zygote (diploid), which develops into a new organism.

It occurs in three phases:

  1. Pre-fertilization Events

  2. Fertilization

  3. Post-fertilization Events


2. Pre-fertilization Events

These events happen before fertilization and include:

(a) Gametogenesis – Formation of gametes

Types of gametes:


(b) Gamete Transfer


3. Fertilization (Syngamy)

Importance:


4. Post-fertilization Events

(a) Zygote Formation

(b) Embryogenesis – Development of embryo


Summary Table:

Event Description
Gametogenesis Formation of gametes
Gamete transfer Male to female
Fertilization Fusion of gametes
Zygote formation Diploid cell formed
Embryogenesis Embryo development

Quick Quiz:

  1. What is anisogamy?

  2. Where does fertilization occur in humans?

  3. What does ovary convert into after fertilization?

Answers:

  1. Fusion of dissimilar gametes

  2. In fallopian tubes (oviduct)

  3. Fruit


Would you like Part 5: Asexual vs. Sexual Reproduction Comparison, or a PDF revision sheet?

BIOLOGY- REPRODUCTION IN ORGANISM Part 4

CBSE Class 12 Biology – Cloudfront.net

Class XII Chapter 1 – Reproduction in Organisms Biology