0:05 the amazing process of photosynthesis a
0:07 look around in nature is an absolute
0:11 treat to our senses we all enjoy the
0:15 colors and fragrance of plants but seem
0:16 to forget about their important
0:20 contribution plants are an absolute
0:24 necessity for life on Earth it is so
0:26 because of the process of photosynthesis
0:30 a closer look at a plant shows that it
0:32 is firmly held in the soil by the help
0:38 of roots these roots absorb water from
0:40 the soil and through the tiny tubes
0:47 transport it to the stem and then to the
0:49 leaves the stem holds the leaves in such
0:51 a way that they absorb maximum energy
0:57 from sunlight a leaf is a very important
1:00 part of the plant photosynthesis the
1:02 ultimate provider of food and oxygen
1:06 occurs in the leaf a leaf consists of a
1:09 flat thin lamina
1:12 which is joined to the stem by a petiole
1:15 the flattened lamina provides large
1:27 cross-section of the leaf shows the
1:29 upper and lower layers of cells which
1:33 are flat and irregular below the upper
1:35 layer is the layer of tightly packed
1:38 cells these cells have specialized
1:41 organelles called chloroplasts
1:43 chloroplasts contain the pigment
1:46 chlorophyll which gives the green color
1:50 to the leaf the next layer has loosely
1:55 arranged cells with large air spaces the
1:59 section also shows tubes specific for
2:01 transporting the absorbed water into the
2:07 leaves the lower layer has many pores
2:10 called stomata each stoma is surrounded
2:12 by two guard cells
2:15 which regulate opening and closing of
2:19 the stomata a leaf absorbs carbon
2:22 dioxide from the environment through
2:24 these stomata which after passing
2:30 through air spaces enter into the
2:38 chlorophyll containing cells both water
2:41 and carbon dioxide molecules are finally
2:47 absorbed by the chloroplast these
2:50 chloroplasts also have the capacity for
2:54 trapping energy from sunlight in this
2:56 energy is used to synthesize glucose and
3:03 these oxygen and glucose molecules
3:13 the glucose is transported through other
3:15 specialized tubes to all parts of the
3:22 plant eating in their growth the oxygen
3:24 present in these air spaces diffuses out
3:29 through the stomata so during
3:31 photosynthesis oxygen is given as the
3:34 life-sustaining gaseous component of the
3:38 atmosphere while glucose or food is
3:40 transported to all parts of the plant
3:48 and used for growth to summarize green
3:49 plants can make their own food by the
3:54 process of photosynthesis plants are
3:56 held in the soil with the help of roots
3:59 these roots absorb water and send it to
4:06 the leaves through specialised tubes the
4:08 lower layer has many pores called
4:12 stomata a leaf absorbs carbon dioxide
4:14 from the environment through these
4:19 stomata both water and carbon dioxide
4:22 molecules are finally absorbed by the
4:27 chloroplast we're in the presence of
4:32 chlorophyll and sunlight they synthesize
4:37 glucose and release oxygen the oxygen
4:45 the glucose is transported through other
4:46 specialized tubes to all parts of the
