Question

1. In what ways is vegetative propagation better than sexual reproduction? 2. Describe parts of flower in brief? 3. How is self pollination different from cross pollination? 4. How are fruits formed? 5. Why is dispersal of seed necessary for growth of plants? ​

Answer 1

1 . It helps growing plant faster thansexual reproduction

2 . sepal - it encloses the entire flower and protects it when flower is in the stage of bud

petal - it help in pollination

pistil - it is female part of flower . It release female gametes

steman - it is male part of flower it releases male gametes

3 . transfer of pollen grains in same flower is called self pollination

transfer of pollen grains in another flower of the same kind is called cross pollination

4 . after the pollen are passed it fertilzes the vile and fruit forms

5 . It is important to out the species rather they die or become extinct

Answer 2

Answer:

1) Vegetative propagation takes less time to produce a new plant . A farmer can grow flowers of more than one colour by applying vegetative propagation . purity of breed can be maintained by vegetative propagation.

3) _self pollination_

I) pollen grains r transferred to the stigma of the same flower.

ii) plant dose not need help of pollinating agent.

_cross pollination_

I) pollen grains are transferred to the stigma of a different flower.

ii) plant needs help of a pollinating agent.

4) After fertilization petals and sepals usually fall off . develops into a fruit, so that nutrition can be provided to the developing seed .

5) If all seed would fall near the parent plant and geminate , there would be too many plantlets in a smaller area . the plantlets shall not be able to get adequate amount of sunlight, oxygen, moisture,etc . As a result , most of the plants would not survive . hence , it is important that new plants grow up far away the parent plant . for this, the seed , the seeds should be spread far wide.

2) #sepals- sepals are green in colour and leaf like structure they protect the inner part of the flower at budding stage.

#petals- petals are usually of bright colour like red , pink etc the bright colour of petals attract insets this helps in pollination.

#stamen- stamen is the male reproductive part of flower it is compost of an anther and filament .

#overy- ovary is the female reproductive part of the flower it has a swollen base tube like structure on the top . the top part is called stigma. and the swollen base is called ovary

ovary produce ovules.