UNIT 3: Vegetative Propagation

Question 1

vegetative propagation

Answer 1

a type of asexual reproduction in plants

1. natural vegetative propagation
2. artificial vegetative propagation

Question 2

asexual reproduction

Answer 2

the production of a new individual from one parent

Question 3

natural vegetative propagation: stem propagation

Answer 3

brand new plants can arise from stems of certain species of plants, e.g. strawberry plants. The strawberry plant sends out long branches from its stem that run along the surface of the soil - they are called ‘runners’. when they are far enough away from the parent plant they send out a shoot and a root and a new strawberry plant is produced.

Question 4

natural vegetative propagation: root propagation

Answer 4

brand new plants can arise from the roots of certain plants e.g. the raspberry plant. The raspberry plant sends out shoots from the roots under the ground. these are called root sprouts or ‘suckers’. they eventually develop into a new plant

Question 5

natural vegetative propagation: leaf propagation

Answer 5

this type of propagation is extremely rare. it occurs in the devils backbone plant. tiny leaflets develop along the edge of a main leaf and then fall off and develop into a new plant

Question 6

natural vegetative propagation: bug propagation

Answer 6

buds are new growth points found on all plants. some buds of some species of plant are capable pf producing a new plant e.g. onion plant

Question 7

artificial vegetative propagation: cutting propagation

Answer 7

removal of a small piece of a parent plant and growing it with the use of various growth regulators e.g. rooting powders such as IBA or NAA

Question 8

artificial vegetative propagation: layering propagation

Answer 8

stem is bent down into the soil nearby and growth regulators added; used on climbing plants such as clematis

Question 9

artificial vegetative propagation: grafting propagation

Answer 9

shoot system (scion) of one plant is attached to the root system (stock) of another plant; used for producing large brightly colored roses or eating apples, both of whose own natural stocks are weak. a strong grafted stock helps to produce a better crop

Question 10

artificial vegetative propagation: tissue culture propagation (micropropagation)

Answer 10

growing a large number of plantlets in nutrient medium from small tissue samples. it is very expensive and labour intensive.

Question 11

Runner

Answer 11

Are horizontal stems that run or grow above ground from which new plants grow

Question 12

Root tuber

Answer 12

A swollen, underground root that remains dormant during winter and from which new plants may grow

Question 13

Bulb

Answer 13

A modified bud