Appu has a single apple tree in his backyard in Himachal Pradesh. His tree began flowering in spring and Appu hopes to have yummy apples by autumn. He knows that pollinated flowers produce fruits. So he manually takes the pollen of each flower and dusts it on the stigma of the same flower.
He waits till autumn but no apples grow. He tries the same procedure next year but fails to get any fruit
Which one of the following options could be the reason as why Appu’s apple tree is not giving any fruit?
Apples do not grow if flowers are self pollinated; they need cross pollination.
Fruits and seeds always grow from flowers. Apple blossoms need to be pollinated to produce fruits and seeds. However, Apple flowers are strange because they are self sterile. In other words, apple blossoms will grow into fruits if and only if cross pollination occurs. Apple fruits will not grow from the flower if the flower is self-pollinated.
Appu has a single tree in his backyard and was dusting the pollen of the same tree on the flowers of the very same tree i.e., he was carrying out self-pollination of the apple blossoms. Thus fruits would not develop. Appu needs another apple tree in his backyard to cross pollinate the flowers and then get apple fruits
Apple trees have this strange behavior in order to increase the diversity of its species.