5.4 plant reproduction (samengevoegd)

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 1

5.4 plant reproduction

Plant parts

Voortplantingsorganen

Stamen

• Anter = produces a large amount of grains/pollen (male gametes). 
• Filament 

Pistil

• Stigma
• Style 
• Ovary = contaiins ovules that each contain an egg cell (female gametes). 

How does pollen reach te pistil? 

Pollination = transfer of pollen from the stamens to the pistil

• Cross- pollination = pollen is transferred to the flowers of another plant

• Self-pollination = pollen is transferred to the flowers of the same plant

Cross-pollination, self-pollination or no pollination?

Insect-pollinated flowers

Outstanding and fragrant flowers.

Wind-pollinated flowers

Less striking small green flowers withouw scent. Stamens and stigma hang out far from the flower.

Bevruchting

Bevruchting

Seed dispersal: wind

Animals eat the flesh and excrete the seeds

The fruits are provides with hooks or barbs

Seed dispersal: animals

Scattered by the plant itself

Seed dispersal

Plant lifecycle

1. Seed germinates, a seedling grows.
   
2. The seedling grows into a mature plant. The mature plant produces flowers.
   
3. Fruits and seeds develop from the flowers.
   
4. The seeds are dispersed. 

Annual plants (1yr), biennial plants (2yr), perennial plants (grow very old), woody plants (grow and then turn into a bush or tree).