Exercise 5; Seed Plants: Gymnosperms & Angiosperms

Describe two reasons why angiosperms are more successful as a group than gymnosperms

1)They use animals to help them pollenate & disperse seeds 2)The fruit is the covering for the seed

Name the two nuclei found in a pollen grain. What does each produce?

1)Tube nucleus-becomes the pollen tube. 2)Generative nucleus-turns into 2 sperms

List the two separate fertilization events that occur in flowering plants.

1)egg+sperm=zygote 2)Sperm #2 fertilize the polar nuclei

Where are pollen grains produced?

Anthers

List the characteristics of gymnosperms

Evergreen, naked seed, make a cone

Which cells undergo meiosis in the ovules?

Megasporocytes

Which cells undergo meiosis in the pollen sacs?

Microsporocytes

Why are seeds reproductively superior to spores?

Seeds have their own food supply & coating

Evergreen

Stays green all year long

Name the region of the pistil where pollen grains land.

Stigma

What tissue becomes the fruit? What is the function of this fruit tissue (how does it aid the plant in completing its life cycle)

The ovary; it attracts birds & mammals

What is the function of the petals? Of the sepals?

Bright colors to attract pollinatars; to protect the bud

What is the function of the micropyle?

Its an opening to receive the sperm

Deciduous

Leaves fall off in the fall

Monoecious

One plant with both male & female parts

List the three components of a seed

Seed coat, food supply, new sporophyte

Following fertilization, the ovule develops into the ____,the integuments form the ______ and the ovary matures into the____

Seed; Seed coat; Fruit

List the characteristics of angiosperms

They make a flower&fruit, double fertilization

Dioecious

Two separate plants, one male & one female