Lecture 7

Question 1

What is a plant stress?

Answer 1

Anything that prevents a plant from growing to its full potential

Question 2

Abiotic stress is caused by

Answer 2

a non-living organism

Question 3

examples of an abiotic stress

Answer 3

salt, temperature, and nutrients.

Question 4

stresses by salts

Answer 4

salts in soils deprive plants of water and dissolve nutrients

Question 5

Low temperature plant stress

Answer 5

Lower temperatures will result in slow plant growth and development.

Question 6

Where is winter burn particularly noticeable?

Answer 6

Evergreen species.

Question 7

High temperature plant stress

Answer 7

Damage plant tissue. the cell proteins coagulate and plant cell dies.

Question 8

Wilting

Answer 8

When plants are unable to take up moisture, they will eventually die because the N.A.R is negative.

Question 9

What is a stomata?

Answer 9

Openings in plant that allow for movement of gases. E.g., photosynthesis and respiration.

Question 10

What do guard cells respond to in order to regulate the opening?

Answer 10

turgor pressure.

Question 11

Trichomes

Answer 11

Hairs. May be unicellular or multicellular.

Question 12

What is a biotic stress?

Answer 12

A stress to a plant caused by a living organism.

Question 13

What are weeds?

Answer 13

Any plant that is growing in a place where it is not wanted.

Question 14

Harvest loss caused by weeds

Answer 14

May occur if the weeds are so thick that harvesting is difficult.

Question 15

toxic weeds

Answer 15

Death cama’s

Question 16

Why are weeds a problem?

Answer 16

Weeds are hard to control because they are very suited to their environment.

Question 17

Rhizomes

Answer 17

Horizontal underground stems

Question 18

Seeds and fruits can be distributed in several ways, such as:

Answer 18

1. ) wind adaptations.
2. ) Water
3. ) Animals

Question 19

The disease cycle is broken in to a number of stages

Answer 19

1. ) Inoculation
2. ) Incubation
3. ) Infection

Question 20

Causes of Infectious Disease

Answer 20

Caused by micro-organism which attack susceptible plants.

Question 21

What is the most common (and important) plant disease causing organism in Western Canada?

Answer 21

Fungi

Question 22

How does Fungi reproduce?

Answer 22

Spores. spreader by wind, water, machinery, animals, insects, contaminated seed, etc.

Question 23

What do plant disease cause?

Answer 23

Yield loss and quality loss.

Question 24

Sclerotinia

Answer 24

Sclerotinia stem rot, commonly known as white mould, is caused
by the fungus Sclerotinia sclerotiorum.

Question 25

What is an Ergot?

Answer 25

A fungal pathogen that creates sclerotia as overwintering bodies.

Question 26

Aster Yellows

Answer 26

A disease caused by phytoplasma that results in phyllode and is transmitted by leaf hoppers.

Question 27

2 groups of insects

Answer 27

1. ) beneficial insects

2. ) Harmful insects

Question 28

Beneficial Insects

Answer 28

Perfect duties advantageous to humans.

Question 29

Harmful Insects

Answer 29

damage to crops, food, buildings, etc.

Question 30

Insect damage. extent of damage depends and how well the plant recovers is dependent on:

Answer 30

1. ) insect population.
2. ) Plant growth stage.
3. ) growing conditions.
4. ) Weather.

Question 31

Who suffers the most from insect damage?

Answer 31

Smaller plants

Question 32

the Cyclical Nature

Answer 32

Damage occurs in a cycle related to life cycle of insect.