`color{blue}"Oviparous Animals"`: Those animals which produce young ones by `color{violet}"means of eggs"` which are `color{violet}"hatched"` after they have been `color{violet}"laid by the parent"`, as in birds.
`color{blue}"Viviparous animals"`: Those animals which `color{violet}"deliver live young ones"` which have `color{violet}"developed inside"` the body of the parent.
`color{blue}"Embryogenesis"`: Embryogenesis refers to the process of `color{violet}"development of embryo"` from the `color{violet}"zygote"`
`color{green} ✍️ color{green} mathbf("KEY CONCEPT")`
● `color{Violet}"Embryogenesis"` refers to the process of `color{Violet}"development"` of `color{Violet}"embryo from the zygote. "`
● During embryogenesis, zygote undergoes `color{Violet}"cell division"` (mitosis) and `color{Violet}"cell differentiation"`.
● While `color{Violet}"cell divisions increase"` the number of cells in the developing embryo; `color{Violet}"cell differentiation"` helps groups of cells to undergo `color{Violet}"certain modifications"` to form `color{Violet}"specialised"` tissues and organs to form an organism.
● Animals are categorised into `color{Violet}"oviparous and viviparous"` based on whether the `color{Violet}"development of the zygote"` take place outside the body of the female parent or inside, i.e., whether they lay `color{Violet}"fertilised/unfertilised eggs"` or give birth to `color{Violet}"young ones"`.
`star` `color{Brown}"In Oviparous Animals"`:
● In `color{Violet}"oviparous animals"` like reptiles and birds, the `color{Violet}"fertilised eggs"` covered by `color{Violet}"hard calcareous shell"` are laid in a safe place in the environment.
● After a `color{Violet}"period of incubation"` young ones hatch out.
`star` `color{Brown}"In Viviparous Animals"`:
● In `color{Violet}"viviparous animals"` (majority of mammals including human beings), the zygote develops into a `color{Violet}"young one"` `color{Violet}"inside the body"` of the female organism.
● After attaining a `color{Violet}"certain stage of growth"`, the young ones are `color{Violet}"delivered"` out of the body of the female organism.
● Because of `color{Violet}"proper"` `color{Violet}"embryonic care"` and `color{Violet}"protection"`, the `color{Violet}"chances of survival"` of young ones is greater in viviparous organisms.
`star` `color{Brown}"In Flowering Plants"`
● In `color{Violet}"flowering plants"`, the zygote is formed `color{Violet}"inside the ovule"`. After fertilisation the sepals, petals and stamens of the flower `color{Violet}"wither and fall"` off.
● The `color{Violet}"pistil"` however, `color{Violet}"remains attached"` to the plant.
● The `color{Violet}"zygote"` develops into the `color{Violet}"embryo"` and the `color{Violet}"ovules"` develop into the `color{Violet}"seed"`.
● The `color{Violet}"ovary"` develops into the `color{Violet}"fruit"` which develops a `color{Violet}"thick wall called pericarp"` that is protective in function.
● After dispersal, seeds germinate under favourable conditions to produce new plants.
`color{blue}"Oviparous Animals"`: Those animals which produce young ones by `color{violet}"means of eggs"` which are `color{violet}"hatched"` after they have been `color{violet}"laid by the parent"`, as in birds.
`color{blue}"Viviparous animals"`: Those animals which `color{violet}"deliver live young ones"` which have `color{violet}"developed inside"` the body of the parent.
`color{blue}"Embryogenesis"`: Embryogenesis refers to the process of `color{violet}"development of embryo"` from the `color{violet}"zygote"`
`color{green} ✍️ color{green} mathbf("KEY CONCEPT")`
● `color{Violet}"Embryogenesis"` refers to the process of `color{Violet}"development"` of `color{Violet}"embryo from the zygote. "`
● During embryogenesis, zygote undergoes `color{Violet}"cell division"` (mitosis) and `color{Violet}"cell differentiation"`.
● While `color{Violet}"cell divisions increase"` the number of cells in the developing embryo; `color{Violet}"cell differentiation"` helps groups of cells to undergo `color{Violet}"certain modifications"` to form `color{Violet}"specialised"` tissues and organs to form an organism.
● Animals are categorised into `color{Violet}"oviparous and viviparous"` based on whether the `color{Violet}"development of the zygote"` take place outside the body of the female parent or inside, i.e., whether they lay `color{Violet}"fertilised/unfertilised eggs"` or give birth to `color{Violet}"young ones"`.
`star` `color{Brown}"In Oviparous Animals"`:
● In `color{Violet}"oviparous animals"` like reptiles and birds, the `color{Violet}"fertilised eggs"` covered by `color{Violet}"hard calcareous shell"` are laid in a safe place in the environment.
● After a `color{Violet}"period of incubation"` young ones hatch out.
`star` `color{Brown}"In Viviparous Animals"`:
● In `color{Violet}"viviparous animals"` (majority of mammals including human beings), the zygote develops into a `color{Violet}"young one"` `color{Violet}"inside the body"` of the female organism.
● After attaining a `color{Violet}"certain stage of growth"`, the young ones are `color{Violet}"delivered"` out of the body of the female organism.
● Because of `color{Violet}"proper"` `color{Violet}"embryonic care"` and `color{Violet}"protection"`, the `color{Violet}"chances of survival"` of young ones is greater in viviparous organisms.
`star` `color{Brown}"In Flowering Plants"`
● In `color{Violet}"flowering plants"`, the zygote is formed `color{Violet}"inside the ovule"`. After fertilisation the sepals, petals and stamens of the flower `color{Violet}"wither and fall"` off.
● The `color{Violet}"pistil"` however, `color{Violet}"remains attached"` to the plant.
● The `color{Violet}"zygote"` develops into the `color{Violet}"embryo"` and the `color{Violet}"ovules"` develop into the `color{Violet}"seed"`.
● The `color{Violet}"ovary"` develops into the `color{Violet}"fruit"` which develops a `color{Violet}"thick wall called pericarp"` that is protective in function.
● After dispersal, seeds germinate under favourable conditions to produce new plants.