Question

question 7 (1 point)
which environmental conditions most favor the germination of fungal spores and the spread of bacterial pathogens?
o a high humidity and prolonged leaf wetness
o b cool temperatures and poor soil nutrition
o c dry air and strong wind
o d high sunlight and low humidity
question 8 (1 point)
which pathogen type is known for causing water-soaked lesions and slimy oozing from infected plant tissues?
o a oomycetes
o b fungi
o c viruses
o d bacteria
question 9 (1 point)
which pathogen was the first virus ever discovered, identified by dmitri ivanovsky in 1892?
o a fire blight
o b late blight
o c fusarium wilt
o d tobacco mosaic virus

Explanation:

Question 7

Fungal spores need moisture to germinate. High humidity and prolonged leaf wetness provide the necessary moisture. Bacterial pathogens also spread more easily in moist conditions as water can act as a medium for their movement. Cool temperatures and poor soil nutrition (b) do not directly favor spore germination or pathogen spread. Dry air (c) and low humidity (d) are unfavorable for fungal spore germination as they lack moisture.

Bacteria are known for causing water - soaked lesions and a slimy ooze from infected plant tissues. Oomycetes (a) cause diseases like downy mildew. Fungi (b) cause a variety of symptoms like rots, rusts etc. Viruses (c) cause symptoms like mosaic, stunting etc.

Dmitri Ivanovsky discovered the Tobacco Mosaic Virus in 1892. Fire blight (a) is a bacterial disease. Late blight (b) is caused by an oomycete. Fusarium wilt (c) is caused by a fungus.

Answer:

A. High humidity and prolonged leaf wetness

Question 8