Asexual Reproduction Video Lecture | Science Class 7

0:0:0: do you know how a new plant grows if you
0:0:4: are thinking that plant grows because of
0:0:6: seeds then let me ask you a
0:0:9: question have you ever seen sugar cane
0:0:12: potato or rose
0:0:15: seeds no right well there are other
0:0:20: interesting ways in which a new plant
0:0:23: can
0:0:23: grow we will learn about them in this
0:0:27: video in this video we will also learn
0:0:30: about what is
0:0:32: reproduction what are different modes of
0:0:34: reproduction and what is asexual
0:0:39: reproduction first of all what is
0:0:43: reproduction the production of new
0:0:45: individual from their parents is known
0:0:48: as
0:0:50: reproduction now this is a very
0:0:52: important
0:0:54: process as you know all the living
0:0:57: things will eventually die now if a
0:1:0: species does not reproduce before it
0:1:3: dies it will become extinct right so
0:1:8: reproduction is very important for the
0:1:10: continuation of
0:1:13: species now let's learn about some
0:1:17: methods of reproduction in
0:1:20: plants we can broadly classify plant
0:1:23: reproduction into two
0:1:25: categories that is asexual and sexual
0:1:31: asexual reproduction is when a single
0:1:34: parent produces
0:1:36: offspring while in sexual reproduction
0:1:39: two parents are
0:1:41: involved in asexual reproduction no seed
0:1:45: is produced but in sexual reproduction
0:1:48: seeds are
0:1:50: produced in asexual reproduction there
0:1:53: is no variation in The
0:1:55: Offspring whereas in sexual reproduction
0:1:59: there are variation in The
0:2:3: Offspring now in this video we will
0:2:5: learn about asexual
0:2:9: reproduction there are four main methods
0:2:13: vegetative
0:2:14: propagation
0:2:15: budding
0:2:18: fragmentation and Spore
0:2:21: formation let us learn about each of
0:2:24: them in
0:2:26: detail the first one is vegetative
0:2:29: proper
0:2:31: propagation have you ever seen a rose
0:2:33: plant growing in your
0:2:35: garden how do you think it was planted
0:2:39: there was it grown from a
0:2:42: seed well no it was grown from a
0:2:47: stem this is an example of vegetative
0:2:51: propagation vegetative propagation is a
0:2:54: type of asexual reproduction in which
0:2:57: new plants are produced from the
0:2:59: vegetative parts of the plants such as
0:3:2: roots stems and
0:3:6: leaves now remember the example of
0:3:9: Rose here the stem is a vegetative
0:3:14: part in this method a part of the stem
0:3:17: is
0:3:18: cut now the lower end of the stem
0:3:21: cutting is buried in the moist
0:3:24: soil after a few days this cutting
0:3:27: develops new roots and this stem
0:3:30: produces a rose flower and converts into
0:3:33: a whole new
0:3:36: plant now some plants can reproduce by
0:3:39: vegetative propagation with the help of
0:3:42: leaves or
0:3:44: Roots let us look at an example of
0:3:47: vegetative propagation with the help of
0:3:50: leaves look at this plant here you can
0:3:54: see Tiny plants coming out of its leaves
0:3:58: right this plant is called a
0:4:2: bopm it has butts on the edges of its
0:4:7: leaves when these leaves fall and come
0:4:10: in contact with the moist soil they
0:4:14: produce new
0:4:16: plants this is how bopm reproduces with
0:4:20: the help of
0:4:22: leaves now let us look at an example of
0:4:26: vegetative propagation with the help of
0:4:28: roots
0:4:30: have you ever eaten a
0:4:32: potato do you know which part of the
0:4:35: plant it
0:4:37: is it is actually a root that stores
0:4:41: food interesting right when these roots
0:4:45: are detached from the parent plant and
0:4:47: planted in the soil they grow little
0:4:50: buds called eyes these eyes or buds grow
0:4:55: into new
0:4:57: plants this is how potatoes reproduce
0:5:1: with the help of
0:5:3: roots so till now we have learned about
0:5:7: three types of vegetative
0:5:9: propagation that are with the help of
0:5:13: stem leaves and
0:5:17: Roots now let's move to the next method
0:5:20: of asexual reproduction known as
0:5:24: budding budding is another type of
0:5:26: asexual reproduction and this method is
0:5:30: common among the species known as
0:5:34: yeast consider the example of
0:5:37: yeast when it finds favorable conditions
0:5:41: a small bulp like projection is produced
0:5:44: from the yeast
0:5:47: cell this is called the bud the bud
0:5:51: grows gradually and then gets detached
0:5:54: from the parent yeast
0:5:57: cell this new cell grows and produces
0:6:0: more cells so in this way large number
0:6:4: of yeast cells can be multiplied in a
0:6:7: short amount of
0:6:9: time now let's move to the next method
0:6:12: of asexual reproduction called as
0:6:18: fragmentation have you ever seen green
0:6:21: slimy threads floating on the surface of
0:6:23: water in ponds or lakes you must have
0:6:27: seen them they are actually
0:6:29: algae one of the most common algae is
0:6:34: Spyro
0:6:35: Gyra these plants reproduce with the
0:6:38: help of
0:6:40: fragmentation fragmentation is another
0:6:43: type of asexual reproduction in which
0:6:46: the parent organism breaks into two or
0:6:50: more fragments as the name
0:6:53: suggests each fragment grows into a new
0:6:58: organism this this method is common in
0:7:1: some animals such as starfish and
0:7:7: earthworm but it is also found in some
0:7:10: algae such as Spyro Gyra now let's move
0:7:15: to the next and the final method of
0:7:18: asexual reproduction that is Spore
0:7:23: formation have you ever seen white or
0:7:26: black spots on the bread or cheese that
0:7:28: have been left for too long I'm sure you
0:7:31: must have do you know what they are they
0:7:36: are actually fungi which are the
0:7:39: organisms that feed on dead or decaying
0:7:42: organic
0:7:44: matter they reproduce through Spore
0:7:47: formation Spore formation is another
0:7:50: type of asexual reproduction in which
0:7:54: the parent organism produces
0:7:57: spores these spores are lightweight and
0:8:0: can float in
0:8:3: air each Spore is covered by a hard
0:8:6: protective coat to withstand unfavorable
0:8:10: conditions such as high temperature and
0:8:13: low
0:8:15: humidity
0:8:17: so they can survive for a long
0:8:20: time under favorable conditions a Spore
0:8:24: germinates and develops into a new
0:8:28: individual this this method is most
0:8:30: commonly observed in fungi like bread
0:8:35: mold to summarize we have learned that
0:8:38: plants can reproduce by asexual methods
0:8:42: namely vegetative propagation budding
0:8:46: fragmentation and Spore
0:8:49: formation asexual reproduction is fast
0:8:52: and easy but results in no
0:8:56: variations we hope that you have UND OD
0:8:59: the concept of asexual reproduction in
0:9:2: plants now here is a secret on how you
0:9:5: can study effectively with the edurev
0:9:8: app you can learn with chapter notes
0:9:11: watch video lectures and solve ncrt
0:9:14: based McQ tests of this chapter on
0:9:18: eduv and that's not all you can also get
0:9:22: amazing courses for class 7th and much
0:9:25: more for your class 7th
0:9:27: preparation thank you