CBSE Questions for Class 8 Biology Reproduction In Animals Quiz 3 - MCQExams.com

• Binary fission is the method of reproduction in which the formation of two daughter cells takes place from one parent cell. It is the most common method of reproduction in bacteria.

So, the correct option is ‘Binary fission’.

• Binary fission is one of the method of asexual reproduction.
• In this process, an organism duplicates its genetic material and divides into two parts where every new organism receives one copy of DNA. 
• This type of asexual reproduction and the most common form of reproduction in prokaryotes and some single-celled eukaryotes.  
• So, the correct answer is option C- '(i) and (iv)'.

Dolly was a female domestic sheep, and the first mammal cloned from an adult somatic cell, using the process of nuclear transfer. One Finn Dorset (provided nucleus) and 2 Scottish blackface ewes, one provided egg, and another surrogate mother. So, three parents were involved.

So, the correct answer is option C. 

• Cloning of an animal using somatic cell was successfully performed for the first time by Ian Wilmut and his colleagues at the Roslin Institute in Edinburgh, Scotland. 
• They successfully cloned a sheep named Dolly. 
• Dolly was born on 5th July 1996 and was the first mammal to be cloned using somatic cell.

• The testes in males produce sperms which are the male gametes. Fertilized eggs are called zygote. 
• The fusion of male and female gametes results in the formation of a zygote.
• The zygote grows and develops into the embryo.

• Apart from the head and the tail, a sperm consists of a middle piece.
• The head of the sperm contains the nucleus, the middlepiece is packed with mitochondria to provide energy for swimming and the tail moves like a propeller.

• Both the egg and sperm are single-celled gametes that are haploid in nature.