Quick Revision: Reproduction in Animals Video Lecture | Science Class 8

0:0:0: today we are diving into an exciting
0:0:2: journey to discover how animals just
0:0:5: like us bring new life into the world
0:0:8: reproduction is the biological process
0:0:11: by which living organisms produce new
0:0:13: individuals of the same kind kind of
0:0:16: like making a copy but not always an
0:0:18: exact one let's explore this in detail
0:0:23: there are two main modes of reproduction
0:0:25: asexual and sexual
0:0:28: reproduction asexual reproduction is
0:0:30: like a solo Mission involving only one
0:0:33: parent gats are not produced and The
0:0:36: Offspring or baby animals are pretty
0:0:39: much identical to their parent on the
0:0:42: other hand sexual reproduction involves
0:0:44: two parents and gats are produced in
0:0:47: this method and the offsprings have
0:0:51: variations now let's learn about sexual
0:0:54: reproduction in the world of animals
0:0:57: including humans there are special parts
0:0:59: that play a big role in making
0:1:2: babies males have testes that make tiny
0:1:5: cells called sperm and females have
0:1:7: ovaries that produce
0:1:9: eggs when a sperm and an egg join
0:1:12: together they form what's called a
0:1:14: zygote which can grow into a new
0:1:17: individual it's like the very first step
0:1:20: of becoming a person let's talk about
0:1:23: how males are designed for this process
0:1:26: they have these tubes called sperm ducts
0:1:28: that carry sperm from the testes to the
0:1:30: urethra during a process called
0:1:33: ejaculation the testes are super
0:1:36: important because they produce sperm and
0:1:38: testosterone male sex hormones that
0:1:40: affect the way bodies
0:1:42: develop and the penis has two jobs it is
0:1:45: used for both the elimination of urine
0:1:48: from the body and the delivery of sperm
0:1:50: for sexual
0:1:51: reproduction even though sperms are
0:1:53: super tiny they have three parts a head
0:1:57: a middle piece and a tail despite their
0:2:0: small size each sperm is a whole cell
0:2:3: capable of making a baby when it joins
0:2:5: an egg imagine such a tiny thing can
0:2:9: start the creation of a new life now
0:2:13: let's see how females are designed for
0:2:15: this process they have something called
0:2:17: the ovaries are where the eggs or ovar
0:2:20: are made the uterus is where a
0:2:23: fertilized egg implants and grows into a
0:2:26: fetus during
0:2:28: pregnancy the UCT or fallopian tube a
0:2:31: passageway for eggs from the ovaries to
0:2:34: the uterus and provides the site for
0:2:36: fertilization by the
0:2:38: sperm now when sperm cells come into
0:2:41: contact with an egg one of them may
0:2:43: Unite with the egg a process known as
0:2:47: fertilization this is the very beginning
0:2:49: of becoming a baby now fertilization is
0:2:52: of two types some animals have babies by
0:2:56: fertilization happening inside the
0:2:58: female's body which we call internal
0:3:2: fertilization others do it outside the
0:3:4: female's body in the environment and
0:3:7: that's called external
0:3:9: fertilization examples of internal
0:3:12: fertilization are humans and monkeys and
0:3:16: example of external fertilization is a
0:3:19: fish now let's see the development of an
0:3:22: embryo fertilization creates a zygote
0:3:26: turning into an embryo the zygote divide
0:3:30: forming a bunch of cells that come
0:3:32: together to shape different body
0:3:34: parts this developing structure called
0:3:37: an embryo is placed in the uterus wall
0:3:40: for further growth the embryo grows
0:3:43: inside the uterus developing hands legs
0:3:47: head eyes and
0:3:49: ears once all body parts are
0:3:52: recognizable it becomes a fetus when the
0:3:55: fetus finishes growing the mother gives
0:3:58: birth to the baby
0:4:0: now animals can be vorous or ovus the
0:4:4: animals which give birth to young ones
0:4:6: are called vorous
0:4:9: Animals those animals that lay eggs are
0:4:11: called ous
0:4:13: Animals every animal from the moment
0:4:16: it's born or hatched starts
0:4:19: growing for example a frog goes through
0:4:22: a wild Journey from being an egg to a
0:4:24: tadpole then a tadpole with legs until
0:4:27: it finally becomes a froglet and then an
0:4:29: adult
0:4:30: frog remember when we talked about
0:4:33: asexual reproduction it's that mode of
0:4:36: reproduction in which only a single
0:4:38: parent is
0:4:39: needed an example of asexual
0:4:42: reproduction is something called budding
0:4:44: seen in creatures like Hydra a Hydra
0:4:48: grows a little bump called a bud this
0:4:51: Bud grows and becomes mature which
0:4:53: eventually becomes a whole new Hydra and
0:4:56: separates from the
0:4:57: parent another example of asexual
0:5:0: reproduction is binary fision what an
0:5:3: amiba does it splits itself into two by
0:5:7: dividing its nucleus and cytoplasm
0:5:9: creating two
0:5:11: amibas it's like cloning itself how
0:5:14: awesome is that we hope that you have
0:5:17: understood the topic you can now study
0:5:20: chapter notes watch video lectures and
0:5:22: solve McQ tests of this chapter on edure
0:5:25: to ensure you score well in your school
0:5:28: exams
0:5:29: and that's not all you also get amazing
0:5:32: courses for maths science English Hindi
0:5:36: and much more for Class
0:5:38: 8 thank you