Unit 4.3 Plant disease triple

Question 1

name a plant disease caused by a virus

Answer 1

tobacco mosaic virus

Question 2

name a plant disease caused by a fungus

Answer 2

black spot

Question 3

plant diseases can be detected by which symptoms?

Answer 3

stunted growth
spots on leaves
areas of decay
discolouration
presence of pests

Question 4

How can gardeners identify plant diseases

Answer 4

1. consulting gardening manual or website
2. take plant to a lab and identify pathogen
3. use tests that contain monoclonal antibodies

Question 5

plants can be infected with viruses, fungus, bacteria and what other organism?

Answer 5

insects - aphids

Question 6

nitrate deficiency symptoms are

Answer 6

stunted growth

Question 7

nitrates in a plant are needed to make

Answer 7

amino acids which make proteins

Question 8

chlorosis is caused by which mineral deficiency?

Answer 8

magnesium

Question 9

symptoms of a plant with chlorosis are

Answer 9

pale yellow leaves

Question 10

why does a plant with chlorosis have yellow leaves

Answer 10

cant make chlorophyll

Question 11

what is magnesium needed for in a plant?

Answer 11

to make chlorophyll

Question 12

name the key mineral ions needed by a plant

Answer 12

magnesium and nitrates

Question 13

Why is chlorophyll in a plant important?

Answer 13

needed for photosynthesis

Question 14

what are aphids

Answer 14

insects

Question 15

what are the 3 main defences plants have against disease/predation?

Answer 15

physical
chemical
mechanical

Question 16

give some examples of physical defences

Answer 16

waxy cuticle - barrier
cell wall
layers of dead cells around their stem

Question 17

What are physical defences

Answer 17

barriers to infection

Question 18

cell wall is made from

Answer 18

cellulose

Question 19

give some examples of chemical defences

Answer 19

antibacterial chemicals which can kill bacteria

posions

Question 20

chemical defences include poisons how does this help a plant?

Answer 20

deters a predator from eating it

Question 21

a herbivore is

Answer 21

an animal that eats plants

Question 22

give some examples of mechanical defences

Answer 22

thorns/spikes
droopy/curly leaves
mimicry

Question 23

what is mimicry?

Answer 23

when organisms mimic other organisms

Question 24

How does mimicry help a plant?

Answer 24

tricks animals into not eating it