Plant Disease

Question 1

Symptoms of TMV?

Answer 1

Mosaic pattern of discolouration on leaves

Question 2

Symptoms of black spot

Answer 2

Purple or black spots on leaves
Leaves often turn yellow and drop early

Question 3

Symptoms of plant infected with aphids

Answer 3

Damaged stems and leaves
Presence of green insects covering stem

Question 4

Symptoms of nitrate deficiency

Answer 4

Stunted growth

Question 5

Symptoms of magnesium deficiency ?

Answer 5

Leaves turn yellow

Question 6

Cause of TMV

Answer 6

Virus

Question 7

Cause if black spot

Answer 7

Fungus

Question 8

What are aphids

Answer 8

Insects

Question 9

What does TMV do?

Answer 9

.Destroys cells
.reduce plant growth because the affected areas don’t do photosynthesis

Question 10

What does black spot do?

Answer 10

Weakens the plant as it reduces the area of photosynthesis.
Doesn’t flower well

Question 11

What do aphids do to plants?

Answer 11

They feed on the Philemon vessels which contain sugar rich sap. This damages and weakens the plant. They can transfer pathogens between plants.

Question 13

What does nitrate deficiency do?

Answer 13

Can’t convert sugars made in photosynthesis to proteins needed for growth.