REPRODUCTION IN PLANTS FOR CLASS VII.pptx

THE GIVEN PRESENTATION CONTAINS INFORMATION REGARDING REPRODUCTION OF PLANTS - CLASS VII

1. REPRODUCTION IN PLANTS REPRODUCTION IN PLANTS

2. What is Reproduction? Reproduction is the biological process by which new individual organisms (offspring) – are produced from their parents . Reproduction is not necessary for keeping the organism alive. Living organisms undergo asexual reproduction, sexual reproduction and vegetative propagation.

3. ASEXUAL REPRODUCTION: Asexual reproduction is a kind of reproduction in which only a single parent is involved . The different forms of asexual reproduction are: Budding Fragmentation Spore Formation

4. Budding: A bulb-like projection protrudes from the body of the parent organism. This projection is called as bud . This bud continues to grow and finally detaches f rom the parent cell and continues to grow as a new individual.

5. Fragmentation Organisms : Spirogyra , Oscillatoria etc. The body of the parent organism breaks into fragments. Each fragment can grow to function as a new individual .

6. Oscillatoria

7. Spore Formation: Spores are tiny, spherical, single-celled bodies that are produced and released from specialized structures of the plant body . These spores can remain dormant during harsh weather conditions. They grow into a new plant under favourable conditions . This method of asexual reproduction is seen in Mosses, ferns, fungi etc.

8. Spores under leaflet of ferns

9. Q:Name an organism that performs budding as a form of asexual reproduction? A: Yeast

10. Q: Name the tiny, spherical and single celled bodies that are produced and released from special structures of plant body. A: Spores

11. Q: Spirogyra and Oscillatoria undergoes sexual reproduction by ................... . A: Fragmentation

12. MARKS OBTAINED : 3/3

13. Vegetative Propagation: Vegetative part : Non- Reproductive part ( root, stem or leaf) This type of reproduction in which new plants grow from vegetative parts of a plant is called vegetative propagation. Vegetative propagation can take place naturally and can also be carried out by direct means.

14. From Stem: (a) Runners : A runner is a slender branch mother plant on the ground, roots itself at the nodes and grows into a new plant Examples : wood-sorrel and grass

15. (b) Stolons : Stolons are lateral slender node branches that arise from the base of the stem. Stolons initially grow upwards and slowly droop to the ground. These stems root at the nodes, producing buds that soon grow into daughter plants. Eg : pepper-mint.

16. (c) Offset : An offset is a short horizontal branch that arises from the axil of a leaf ( leaf axil is where the leaf stalk attaches to the stem ). Eg : Water Lettuce

17. (d) Suckers : Suckers grow from stem, the underground part of the main develop roots underground and then grow obliquely upwards giving rise to new plants Example : Chrysanthemum