Sexual Reproduction in Flowers

Question 1

What is the difference between a bisexual flower and a unisexual flower?

Answer 1

A bisexual flower contains stamens and a pistil with also female and male reproductive parts. A unisexual flower can either have male or female reproductive parts and it only has stamens or a pistil.

Question 2

What are the three ways a flower can be pollinated?

Answer 2

Animals, wind and water.

Question 3

How do animals pollinate flowers?

Answer 3

The flowers attract animals by having pretty colours and sweet nectar which animals brush against getting some of the pollen.

Question 4

How does the wind pollinate flowers?

Answer 4

These flowers have much more anthers to grab the pollen when it is blown from another flower.

Question 5

How does water pollinate flowers?

Answer 5

These flowers have to live in water, they produce pollen that floats to the surface and floats to a flower in the water but the flower has to stick out of the water.

Question 6

Explain in point form the fertilisation process of flowers.

Answer 6

• Pollination take place (Water, animals and wind)
• Pollen grains land on stigma (Releases chemicals)
• Stigma opens a tube called a pollen tube and the pollen goes down it (Male gametes travel) (Goes into ovary)
• Pollen tube leads into the ovule, which contains the embryo sac which has the female gametes.(Both fuse together) (When fuses becomes endosperm)
• Both fuse together inside the embryo sac which forms a zygote. (Zygote will grow into seed) (Male= half DNA and female= Half DNA)
• Endosperm becomes the food for the zygote.
• After this, the ovary swells and enlarges which forms a fruit.
• Inside the zygote becomes the seed.