Plant Path

43問 • 1年前

問題一覧

Fungi are usually multicellular eukaryotic organism that are known to be heterotrophs, meaning they are not capable in making their own food. What fungal structure do fungi utilize to take food from its host?

haustorium

All of the ff belong to the Order Uredinales except:

Pleorotus ostreatus

It is the quantitative amount of disease that an isolate of a given pathogen can cause in a given group of plants in terms of size or number of lesions

virulence

Which of the ff does not belong to the group?

Pycnidium

Viruses are ultramicroscopic particles, thus requiring specialized processes in studying it. All the ff are transmission processes in studying viral particles except:

none of the above

What is the casual organism for the bacterial leaf spot of tomato?

Xanthomonas campestris pv. vesicatoria

A virus is diff from a viroid in that the viroid is composed of

single stranded RNA alone with extensive base pairing

Which of the ff is not a definition of plant disease?

any agent which causes a disease

Which of the ff is not an example of parasitic plant?

goose grass

The casual agent of soft rot vegetable is _____?

Pectobacterium carotovorum

These pathogens are known to cause cadang-cadang of coconut

viroids

It causes the bacterial leaf blight of rice

Xanthomas oryzae pv. oryzae

The disease in banana causes the shortening of internodes of shoots or branches resulting in crowding of foliage

bunchy top

The ff are signs of fungal diseases except?

ooze

The spores of this microbial agent enter through the body openings or adhere to the cuticle of the nematode, germinate and penetrate making it strongly parasitic on all stages of development of common plant parasitic nematodes, esp. the eggs

Paecilomyces lilacinus

This is the rice fungal disease that caused Bengal famine in 1943

brown spot disease

This part is missing in mollicutes

cell wall

Flagellation patterns characteristics by the presence of single flagellum

monotrichous

The fungus that causes downy mildew of corn

Peronosclerospora philippinensis

It is major constituent of middle lamella of cell walls

calcium

The central atom in chlorophyll molecule and activator of enzyme

magnesium

The first report of insect transmission of a plant virus in the country dates back to 1926 when Gerardo O. Ocfemia reported transmission of a plant virus by Pentalonia nigronervosa. What is the particular virus disease?

abaca bunchy top

Cadang-cadang disease which is caused by Coconut cadang-cadang viroid (CCCVd) becomes widely distributed in the central Philippines. Because of this, strict enforcement of quarantine regulations by concerned government agencies on the safe movement of coconut germplasm from infected areas is heightened to prevent its further spread to diseased-free areas. The name Cadang-cadang is derived from the Bicol term gadan-gadan which means ____

dying

Different pathogens may cause the formation of identical symptoms

true

The classification according to the type of pathogen that cause the disease is preferred by many workers because of the etiological basis

true

The non-parasitic agents of disease cause non-infectious or physiological disorders which can recognised by their symptoms

true

Plants infected with ____ have masked symptoms

virus

An obligate parasite can grow only in association with a _____

living host

Fungal sub-species that has no apparent morphological diff from other similar sub-species but differs in host range is called

formae speciales

Orange gall caused by Synchytrium psophocarpi is a fungal disease of ____

winged bean

In non-circulative virus-vector relationship, the virus binds the stylet during feeding and is released when the insect secretes saliva on a new feeding place

true

The virus circulate in the host and infects insect cells and replicates in the vector

none of the above

Unlike most disease, stem rust requires two plants to complete the entire cycle. The common ____ is the alternate host to the stem rust fungus, and is crucial to the pathogen completing its life cycle

Berberis vulgaris

According to the Department of Foreign Affairs, the Philippines will start shipping fresh mangoes to Australia this month. The SCU is an arrangement document for the importation of fresh mango fruit from the Philippines to Australia under Australia's Biosecurity Act 2015, which has been amended and updated throughout the years to include export opportunities for Filipino mango farmers, according to the ____

BPI-NPQSD

In 2021, about a thousand hectares of ricefields in the third district of Albay are unproductive due to rice tungro virus disease. According to Rep. Joey Sarte Salceda, the disease so far affected the ff municipalities: ___, ___ , and _____

Polangui, Oas, Libon

The lack of protein-coding capacity of viroids entails that their replication mechanism is much more host-reliant

True

Tungro is a viral disease caused by a complex of two viruses and it provides an excellent system to understand the host and virus interactions during infection. It is known that RTBV is the major determinant of the disease while RTSV accentuated the symptoms

both statement are true

A disease cause by fastidious vascular bacteria

Pierce's disease of grapes

The main components of plant viruses are

eirher DNA or RNA + protein

The presence of different nuclei in the same mycelium is termed as

heterokaryosis

Spores produced from fragmentation of hyphal cells A. Chlamydospores B. Arthrospores🤞 C. Catenate spores D. Basidiospores

Arthrospores

Which of the ff disease is caused by viroid?

potato spindle tuber

Which of the ff is incorrect?

Belonolaimus sp. -lance nematode

CropSc 01

Anne Ranay · 100問 · 1年前

CropSc 01