Alternation of Generation

Question 1

Why do we need plants?

Answer 1

• Provide oxygen and food
• Slow down erosion, desertification and sand storms
• Habitat for organisms
• Wood for products
• Improve mental health

Question 2

What’s asian dust?

Answer 2

Dust originating from deserts and is carried by wind over large areas

Question 3

Define seed

Answer 3

Mature, fertilized ovule with three basic parts: embryo, seed coat (testa), food source

Question 4

Seed: function of seed coat (testa)

Answer 4

Protects embryo

Question 5

Seed: function of food source

Answer 5

Nourishes embryo

Question 6

Define alternation of generations

Answer 6

Alternation of diploid and haploid forms in an organism’s life cycle

Gametophyte > fusion of parents > zygote > mitosis > sporophyte > meiosis > distribution of sporangia > gametophyte

Question 7

Define archegonia and antheridia

Answer 7

Archegonia: egg in female non-seed plants

Antheridia: sperm in male non-seed plants

Question 8

Sporophyte vs gametophyte

Answer 8

Sporophyte: diploid spore-producing phase in the alternation

Gametophyte: haploid gamete-producing phase in the alternation - antheridia and archegonia

Question 9

What plants fall under gametophyte dominant?

Answer 9

Bryophytes - gametophytes are aided by water

Question 10

What plants are sporophyte dominant but gametophyte free living?

Answer 10

Ferns

Question 11

What plants are sporophyte dominant and have reduced gametophytes?

Answer 11

Gymnosperms and angiosperms

Question 12

Advantage of a diploid over a haploid:

Answer 12

Are able to avoid unwanted mutations

Question 13

Define homospory

Answer 13

1 type of spore

Ex: Lycopodium (ground pine)

Question 14

Define heterospory

Answer 14

2 types of spores

Ex: Selaginella (spike moss)