5.11 The sex life of plants

Question 1

the reproductive part of angiosperms containing petals, stamens and carpels. They are often colourful to attract pollinating insects.

Answer 1

flowers

Question 2

the coloured parts of a flower that attract insects

Answer 2

petals

Question 3

parts of a flower, at the base of the petals, that secrete nectar

Answer 3

nectaries

Question 4

fine powder containing the pollen grains (the male sex cells of a plant)

Answer 4

pollen

Question 5

the female part of a flower, at the top of the carpel, that catches the pollen during pollination

Answer 5

stigma

Question 6

transfer of pollen from the stamen (the male part) of a flower to the stigma (the female part) of a flower

Answer 6

pollination

Question 7

transfer of pollen from the flower’s own stamen to its stigma

Answer 7

self-pollination

Question 8

transfer of pollen from stamens of one flower to the stigma of a flower of another plant of the same species

Answer 8

cross-pollination

Question 9

flowers that receive pollen carried on the body parts of insects from other flowers

Answer 9

insect-pollinated flowers

Question 10

flower that receives pollen carried by the wind from another flower

Answer 10

wind-pollinated flowers

Question 11

the male part of a flower that makes pollen

Answer 11

anthers

Question 12

the male gametes of a flower

Answer 12

pollen grains

Question 13

long tube growing from a pollen grain through the style to the ovule

Answer 13

pollen tube

Question 14

the supporting part of a flower that holds the stigma

Answer 14

style

Question 15

receptacle within an ovary that contains egg cells

Answer 15

ovules

Question 16

in plants, the hollow, lower end of the carpel containing the ovules (the female egg cells); in animals, the female organ that produces ova and reproductive hormones

Answer 16

ovary

Question 17

penetration of the ovum by a sperm

Answer 17

fertilisation

Question 18

food supply for the embryo plant in a seed

Answer 18

endosperm

Question 19

product of a fertilised ovule

Answer 19

seed

Question 20

the protective layer around a seed

Answer 20

seed coat

Question 21

ripened ovary of a flower, enclosing seeds

Answer 21

fruit

Question 22

scatter the seeds from plants

Answer 22

disperse

Question 23

small bud at the tip of the embryo plant in a seed

Answer 23

plumule

Question 24

the beginnings of a root making up part of a plant embryo inside a seed

Answer 24

radicle

Question 25

special leaves of the embryo plant inside a seed that provide food for the developing seedling

Answer 25

cotyledons

Question 26

first sign of growth from the seed of a plant

Answer 26

germination

Question 27

young plant produced from the embryo in the seed after germination

Answer 27

seedling