Gametes: structure and function

Question 1

gametogenesis

Answer 1

the formation of gametes by meiosis in the sex organs

Question 2

oocyte

Answer 2

a cell in an ovary which may form an ovum if it undergoes meiotic division

Question 3

acrosome

Answer 3

the region at the head of the sperm that contains enzymes to break down the protective layers around the ovum

Question 4

zona pellucida

Answer 4

a layer of protective jelly around the unfertilised ovum

Question 5

sporophyte generation

Answer 5

the diploid generation in plants that produces spores by mitosis

Question 6

gametophyte generation

Answer 6

the haploid generation in plants that give rise to the gametes by mitosis

Question 7

sporophyte

Answer 7

the diploid main body of the plant

Question 8

microgametes

Answer 8

the male gametes produced in plants, the pollen grains

Question 9

tube nucleus

Answer 9

the male nucleus that will control the production of the pollen tube in fertilisation

Question 10

generative nucleus

Answer 10

the male nucleus that will fuse with the female nucleus

Question 11

pollen tube

Answer 11

a tube that grows out of a pollen grain down the style, into the ovary and through the micropyle of the ovule to carry the generative nucleus (which divides to form two male nuclei) to the ovule

Question 12

placenta (plant)

Answer 12

the pad of special tissue that attaches the plant ovule to the ovary wall

Question 13

megagamete

Answer 13

the female gamete, the egg cell, in plants