Students can go through AP State Board 7th Class Science Notes Chapter 13 Seed Dispersal to understand and remember the concept easily.
AP State Board Syllabus 7th Class Science Notes Chapter 13 Seed Dispersal
→ After fertilization ovary develops as fruit.
→ Ovules develop into seeds.
→ When seeds germinate they give birth to new plants.
→ To avoid competition with the mother plant for air, water, and minerals, plants disperse their seeds to different distances.
→ Seeds of caltrops have light and hairy structures at one end.
→ Seeds that are dispersed through the air are usually light and are either very small or are light with wings on them.
→ In plants like maple, seeds have wing-like outgrowths.
→ The seeds adapted to float on water are usually light.
→ The entire coconut fruit floats on water and moves from one place to another.
→ Some seeds are sticky and get stuck to the beaks of birds and in course of flight they fall down at distant places.
→ People transfer seeds from one place to another.
→ A mustard plant produces more than 10,000 seeds in its lifetime.
→ Seeds are carried from one place to another so that they get suitable conditions to grow, this is called the dispersal of seeds.
→ Seed dispersal is essential for the survival of plants.
→ Seeds are of different shapes and sizes and structures on them that help in dispersal.
→ Seeds are dispersed by wind, water, birds, and animals.
→ Dispersal: Disband, separate.
→ Bursting: Break suddenly and violently apart.
→ Mechanism: A part of the machinery.
→ Fleshy fruit: The fruit has a rich plump which is thought and soft. ex: Mango
→ Germinate: Begin or cause to.
→ Survival: Continue to live or exist.
→ Condition: State of affairs, situation.
→ Excretion: Expel waste matter from the body.
→ Capsule: A small container with medicine inside which you swallow
→ Notice: Attention, heed, note.
→ A mustard plant produces more than 10.000 seeds in its lifetime. If all the seeds germinate to grow into adult plants, think how many seeds would be produced. If this happens for a period of six years the entire globe will be covered with mustard plants!
→ Archimedes:
- Archimedes, the father of modern mathematics lived during 287-212 B.C There is no school for the boy who does not know the story of Aim’discovery of the Principle of Displacement.
- Archimedes’ military inventions were spectacular. He devised cranes and multiplies which would enable a single man to lift the enemy’s vessels out of water.
- He was so absorbed in Geometry that he died unaware of a Roman soldier who ran his sword through him.