Reproduction in Animals
Q1: What is metamorphosis? Give examples.
Answer:
Metamorphosis, which occurs during an invertebrate or amphibian’s life cycle, is the process by which an animal transforms from a larva to an adult. For instance, a frog and a butterfly.
Q2: What are the two types of animals categorized based on giving birth? Give an example.
Answer:
Two types of animals categorized based on giving birth are:
- Viviparous animals E.g. Dogs
- Oviparous animals E.g. Birds
Q3: What is binary fission?
Answer:
Binary fission is an asexual reproduction process in which first the nucleus divides and forms two nuclei; later cytoplasm gets divided where each part gets a nucleus thus producing a single parent.
Q4: Write a short note on the process of sexual reproduction.
Answer:
Sexual reproduction is the method by which new individuals are formed by the fusion of male and female gametes. Sperm is the male gamete, whereas egg or ovum is the female gamete. Male and female gametes fuse to form the zygote by fertilisation. The zygote undergoes cell division several times to develop into an embryo. Thereby new individuals are formed.
NCERT Notes for Class 8 Science Chapter 6: Reproduction in Animals
NCERT Notes for Class 8 Science Chapter – 6: Reproduction in Animals: Reproduction is essential for species to survive; it ensures their continued existence for many generations by passing on traits from one generation to the next. Without it, individuals of similar genetic makeup would not continue beyond a single generation. Through these notes, the students will be able to revise essential topics like different modes of reproduction, sexual reproduction, Male reproductive organ, female reproductive organ, fertilization, test tube babies, external fertilization, development of an embryo, internal; fertilization, asexual reproduction, budding, binary fission and an introduction to the cloning process and the story of Dolly the sheep.