Asexual And Sexual Reproduction

Question 1

Asexual reproduction

Answer 1

ONE parent

Genetically identical

Question 2

Binary fission

Answer 2

Parent cell divides into 2

BACTERIAL cell divides into 2 by making new cells

Question 3

Spore production in fungi

Answer 3

Pin mould is a fungus which grows on bread

Reproduces ASEXUALLY by creating spores

Question 4

Tuber formation in potatoes

Answer 4

Stem tubers- sucrose is transported in phloem from leaves into these undergroubd stem that swellbas they convert the sucrose into starch

Question 5

Advantages of asexual reproducyion of potatoes

Answer 5

Produce rapidly
Grow rapidly
Not wasted seeds

Question 6

Disadvantage of tuber formation in potatoes

Answer 6

Little variation

Quick spread of disease

Question 7

SEXUAL REPRODUCTION

Answer 7

2 parents
Sex organs ( gametes)
Non_ -identical offspring
Gametes fuse- ZYGOTE

Question 8

Advantages of sexual reproduction

Answer 8

Variety offspring
Seed production-disperse to new areas
Survive and adapt better to new env.

Question 9

Disadvantage of sexaul reproduction

Answer 9

X well adapted to the existing conditions as their parents

Question 10

Flower structure

Male parts

Answer 10

Anther , filament - STAMEN

Question 11

Flower structure

Female parts

Answer 11

Stigma, ovary, style -CARPEL

Question 12

What is pollination

Answer 12

Transfer pf pollen e

Question 13

Insect-pollinated flowers
PETALS-
ANTHER-
FILAMENT-
POLLEN-

Answer 13

PETALS- coloured, scented
ANTHER- pollen is made, inside flower
FILAMENT- hold anther, shot
POLLEN- small quantities, sticky and spicky

Question 14

Wind pollinated flowers
PETALS-
ANTHER-
FILAMENT-
POLLEN-

Answer 14

Petals- dull, small
ANTHER- hang outside flower
FILAMENT- Long, outside flower
POLLEN- large quantities, smooth, light

Question 15

What is selfpollination

Answer 15

When the pollen is transferred from anther to stigma of the same flower
Less variation

Question 16

What is cross pollination?

Answer 16

Pollen transfered tona stigma of another plant

Greater variation

Question 17

Stages of fertilisation in flower

Answer 17

1. Pollen lands on stigma- grow pollen tube throght style by enzymes
2. Take male nucleus to ovary and enters through the hole MICROPYLE
3. Male gamete fuse w/ egg cell nucleus- ZYGOTE
4. Protective seed will grow around ZYGOTE and ovary becomes fruit
5. Rest of flowers will die and fall

Question 18

Conditions for germination

Answer 18

Oxygen- aerobic repiration to provide embryo w/ energy
Water- seeds to swell activates enzymes
Warm temp- enzymes work efficiently

Question 19

What is a gamete

Answer 19

Sex cells

Question 20

Sperm

What does the head have

Answer 20

Acrosome- ensymes

Nucleus

Question 21

Sperm

What does the middle part have

Answer 21

Mitochondria- energy for movement from respiration

Question 22

Sperm

Tail/flagellum

Answer 22

Adapted for swimming

Question 23

Egg cell

Jelly coat

Answer 23

Block any sperm from entering after fertilisation

Question 24

Egg sperm

Answer 24

Mother chromosome

Question 25

Zygote is a diploid/haploid

Answer 25

Diploid

Question 26

Diploid has…

Answer 26

46

Question 27

Haploid has…

Answer 27

23

Question 28

Stages of fertilisation and implantation

Answer 28

1. Sperm fuses w/egg- ZYGOTE in oviduct
2. Zygote divides into 2 by MITOSIS and becomes embryo
3. embryo moves down the oviduct by peristaltic movements
4. Embryo embeds into the soft lining of the uterus- IMPLANTATION
5. Uterus thuckened
6. Embryo- nutrients and oxygen from these blood vessels by diffusion
7. Carbon dioxide, chemical waste- diffuse opposite direction