Reproduction of Seed Plants: Assignment #1

Question 1

Alternation of generations

Answer 1

the dominant generation of seed-bearing plants (ie, the most recognizable) is the diploid sporophyte

Question 2

Cones

Answer 2

the reproductive structures produced by many mature sporophyte gymnosperms

Question 3

2n Pollen Cones

Answer 3

• reduced in size, papery

- release thousands of pollen grains, some of which reach seeds by wind

Question 4

2n seed/ovulate cones

Answer 4

• larger, more obvious cones you se on the tree or on the ground
• 2 ovules are found at the base of each scale (modified leaf); this is where the female gametophytes develop naked/unprotected by a fruit
• two seeds should form per scale
• each should be dispersed by the wind; key adaption for this type of dispersal: wings

Question 5

Flower

Answer 5

• the sexual reproductive structure of angiosperms

- parts are arranged in circles of whorls; all parts are modified leaves

Question 6

Complete Flower

Answer 6

one which possesses both pistils and stamens; all whorls are present

Question 7

Incomplete Flower

Answer 7

one which possesses either pistils or stamens

Question 8

Sepals

Answer 8

• collectively: the calyx
• description: may or may not be photosynthetic; may be colored
• function: protect the developing flower before it blossoms; if colored: helps to attract pollinators

Question 9

Petals

Answer 9

• collectively: the corolla
• description/function: usually used to attract pollinators
• sterile leaves: not producing sperm and egg

Question 10

Stamens

Answer 10

• collectively: the androecium
• description: male part
• components: anther and filament

Question 11

Anther

Answer 11

site of pollen grain (male gametophyte) formation

Question 12

Filament

Answer 12

stalk that suspends the anther, allowing for better contact with pollinators or wind exposure