types of reproduction and reprod in plants

Question 1

asexual reproduction

Answer 1

process resulting in genetically identical offspring from one parent

Question 2

sexual reprodcuction

Answer 2

involving the fusion pf the nuclei in the two gametes to form a zygote and the productiopn of offspring that are geneti diff

Question 3

egg/ovulum and sperm nr

Answer 3

haploid - 23 chromosomes

Question 4

zygote and embryo nr

Answer 4

46 chromosomes

Question 5

characteristics of insect-polinated plants

Answer 5

large colorful petals, sweetly scented, nectaroes, moderate amount of pollen, pollen is sticky and spickym anther and stigma inside

Question 6

characteristics on wind pollinated planta

Answer 6

dull petals, no scent, no nectarie, huge amount of pollen , pollen round light smooth, anther ans stigma hangin out

Question 7

function of sepal

Answer 7

protect de flower bud

Question 8

function of petal

Answer 8

attract insct

Question 9

function of antehr

Answer 9

has pollen sacs w pollen grains which contain the male gamete

Question 10

function of stigma

Answer 10

platform on which pollen grains land, female

Question 11

function of ovary

Answer 11

hollow chamber, ovules grow inside

Question 12

function of ovule

Answer 12

contains the female sex cell, found inside the ovary

Question 13

pollination

Answer 13

transfer of pollen grains from the male part of the plant (anther of the stamen) to the female part (stigma)

Question 14

self-pollination

Answer 14

transfer to pollen grains from the anther of a flowr to the stigma of the same flower - very efficent, no genetic variation

Question 15

cross pollination

Answer 15

tranfer of pollen grains from another flower to the stigma of a diff flowa of the same species, risky pollen might not reach the other flowers, chance for genetic variation

Question 16

steps of fertilisation in plants

Answer 16

1 the pollen grain lands on the sticky stigma and produces a pollen tube
2 it creates a tunnel down the style
3 through the micropyle to the ovules
Once the nuclei ( have joined together, that ovule has been fertilised and a zygote has been formed
The zygote will start to divide and eventually form a seed within the ovule

Question 17

germination

Answer 17

Germination is the start of growth in the seed, controilled by enzymes

Question 18

factors required for successful germination

Answer 18

Water – allows the seed to swell up and the enzymes in the embryo to start working so that growth can occur
Oxygen – so that energy can be released for germination
Warmth – germination improves as temperature rises (up to a maximum) as the reactions which take place are controlled by enzymes