Reproduction in Animals Q.4) Differentiate between: Unisexual and Bisexual organisms Viviparous and Oviparous animals External and Internal Fertilization Sexual and Asexual Reproduction Ans.(i) UNISEXUAL BISEXUAL OR HERMAPHRODITE are separate,i.e.,either male or Both male and female sex organs are female sex organs are present in an present in one organism. organism. Each organism produces only one type Each organism produces both male male or female of gamete,i.e.,either and female gametes. gametes . Examples: earthworm, leech, hydra, etc. Examples: dog, cat, cow,fish, birds, reptiles, human beings, etc. (ii) VIVIPAROUS OVIPAROUS Animals which give birth to young ones. Animals which lay eggs. Examples: dog, cat, cow, rat, human Examples: lizard, fish, frog, snake, being, etc. crow, hen, butterfly, etc. (iii) EXTERNAL FERTILIZATION INTERNAL FERTILIZATION The fusion of male and female gametes The fusion of male and female gametes take place outside the body of the take inside the body of the female. female. Examples: cat, dog, human beings, etc. Examples: frog, fish (iv)
Reproduction in Animals Q.4) Differentiate between: Unisexual and Bisexual organisms Viviparous and Oviparous animals External and Internal Fertilization Sexual and Asexual Reproduction Ans.(i) UNISEXUAL BISEXUAL OR HERMAPHRODITE are separate,i.e.,either male or female sex organs are present in an organism. Both male and female sex organs are present in one organism. Each organism produces only one type of gamete,i.e.,either male or female gametes . Examples: dog, cat, cow,fish, birds, reptiles, human beings, etc. Each organism produces both male and female gametes. Examples: earthworm, leech, hydra, etc. (ii) VIVIPAROUS OVIPAROUS Animals which give birth to young ones. Examples: dog, cat, cow, rat, human being, etc. Animals which lay eggs. Examples: lizard, fish, frog, snake, crow, hen, butterfly, etc. (iii) EXTERNAL FERTILIZATION INTERNAL FERTILIZATION The fusion of male and female gametes take place outside the body of the female. Examples: frog, fish The fusion of male and female gametes take inside the body of the female. Examples: cat, dog, human beings, etc. (iv)
Reproduction_in_Animals.docx