AP BIOLOGY

PLANTS

PLANT REPRODUCTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What must happen for fertilization to occur in flowering plants
A
The plant must be exposed to sunlight during pollination
B
The sperm cells in the pollen tube must be able to reach the eggs in the ovules.
C
The eggs in the ovules must be able to reach the top of the stigma where pollen is trapped.
D
All of these
Explanation: 

Detailed explanation-1: -From the anther the pollen grains are first deposited on the pistil’s surface, the stigma . There they germinate and form pollen tubes, which grow downward through the style toward the ovules. Fertilization occurs as a sperm cell in a pollen tube fuses with the egg cell of an ovule, resulting in a plant embryo.

Detailed explanation-2: -In plants, fertilization is a process of sexual reproduction, which occurs after pollination and germination. Fertilization can be defined as the fusion of the male gametes (pollen) with the female gametes (ovum) to form a diploid zygote. It is a physicochemical process which occurs after the pollination of the carpel.

Detailed explanation-3: -The process of fertilization in plants occurs when gametes in haploid conditions meet to create a zygote which is diploid. The male gametes of the flower are transferred on to the female reproductive organs through pollinators. The final product of this process is the formation of embryo in a seed.

Detailed explanation-4: -Fertilization: The fusion of male and female gamete to form a zygote is called fertilization. As a result of pollination, pollen grains are deposited on the stigma of the carpel, and it grows into a pollen tube. The Pollen tube pierces the stigma and grows through style.

Detailed explanation-5: -Final answer: Fertilisation occur in ovary of flowering plant.

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