1. How is self pollination different from cross pollination?
2. How are fruits form
3. Why is dispersal of seeds necessary for growth of plants?
Answers
Explanation:
1. self pollination
Transfer pollen grains from the anther to the stigma of the same flower.
Transfer pollen grains from the anther to the stigma of a different flower.
This process can take place in the same flower or a different flower of the same plant.
This process can take place between two flowers present on different plants.
It occurs in the flowers which are genetically identical.
cross pollination
For cross-pollination to happen, the flower should be open.
No need for pollinators to transfer pollen grains. Require pollinators to transfer pollen grains.
Pollen grains are transferred directly to a flower’s stigma.
Pollen grains are carried via wind, insects, animals, water, etc.
2. A fruit results from maturation of one or more flowers, and the gynoecium of the flower(s) forms all or part of the fruit. Inside the ovary/ovaries are one or more ovules where the megagametophyte contains the egg cell. After double fertilization, these ovules will become seeds.
3.Dispersal of seeds is very important for the survival of plant species. If plants grow too closely together, they have to compete for light, water and nutrients from the soil. Seed dispersal allows plants to spread out from a wide area and avoid competing with one another for the same resources.
Ans 1 )
- Self Pollination - Pollen grains are transferred , from anther to stigma of the same flower is called self pollination .
- Cross Pollination - Pollen grains are transferred from anther to stigma to a flower on a different plant of the same kind is called cross pollination
Ans 2 )
After fertilization , the ovary begins to grow and forms the fruit . The fruits may be sweet and juicy , or they may be hard or woody . The fruit is thus a ripened ovary .
Ans 3 )
Dispersal of seeds is important because , if the seeds are not dispersed , a large number of germinating seedlings can grow very near to the parent plant . This will result in competition between all such seedlings as well as the parent plant . The competition is for getting light , space , water and nutrients ; all of these are important for plant to be able to grow and survive .