Green Plants Part 2

Question 1

What is the first step in the process of double fertilization?

Answer 1

Pollen grain absorbs water and germinates on the stigma, and the pollen tube begins growing down the style.

Question 2

What happens to the generative cell nucleus during double fertilization?

Answer 2

The generative cell nucleus divides by mitosis to form two sperm in the pollen tube.

Question 3

In double fertilization, what does the pollen tube do after completing its growth?

Answer 3

The pollen tube passes through the micropyle and discharges the two sperm into a synergid.

Question 4

What occurs when one sperm unites with the egg during double fertilization?

Answer 4

It forms a zygote.

Question 5

What is formed when the second sperm fuses with the two polar nuclei?

Answer 5

Endosperm (nutrient tissue).

Question 6

What nutrients are loaded in the endosperm after double fertilization?

Answer 6

• Starch
• Oils
• Other proteins

Question 7

Fill in the blank: The endosperm will provide nutrients needed by the embryo after it _______.

Answer 7

germinates

Question 8

True or False: Double fertilization involves the fusion of one sperm with the egg and another with the polar nuclei.

Answer 8

True

Question 9

Double fertilization

Answer 9

is two spern combining with two polar nuclei to form endosperm