Question

The rusts are a serious disease of our economic plants. The disease is caused by the fungus :
 A.Rhizopus
B.Ustilago
C.Puccinia
D.Agaricus

Answer 1

Hint: Rusts are plant illnesses brought about by pathogenic parasites of the order Pucciniales. Rust growths are profoundly specialized plant microbes with a few novel features. Rust growths are assorted and influence numerous plants. Rust parasites are obligate plants to pathogens that just contaminate living plants.

Complete answer:
Rhizopus: They are categorized as saprophytic fungi that are found in plants and parasitic in animals. There are almost eight species of Rhizopus and are multicellular. They are answerable for causing a shrewd disease known as obtrusive mucormycosis in people and animals. A few animal varieties are utilized for modern significance, for example, Rhizopus stolonifer, which caused bread form.

Ustilago: Ustilago, the most significant variety of the family Ustilaginaceae, is spoken to by more than 400 cosmopolitan species. The indications show up just on the botanical parts. The botanical spikes turn dark and stay loaded up with the muck spores. The parasite is of much economic significance since it makes grave misfortune different monetarily significant plants.

Puccinia: It is a pathogenic fungus that is responsible for causing Rust in various plant parts. They can affect multiple cultures of plants once the spore of the fungi lands on the plant surface. Following this, germination takes place, and the fungi perform invasion of the host. Therefore, all the fungus species in this genus are obligate pathogens that are known as rusts. Generally, these fungus attack the plant part that is above the ground.

Agaricus: It is a saprophytic fungus found in decaying litter, soil humus, and wood logs. It is an edible fungus belonging to the family Agaricaceae. There are almost 17 species of Agaricus that are found in India.

So, the correct answer is “C- Puccinia.”

Note:
While framing such questions, students’ fundamental mistake is to confuse the pathogens’ names and their characteristics. Firstly, try to identify the family of the organism. Noted below are the family of these organisms-

Rhizopus: Mucoraceae
Ustilago: Ustilaginaceae
Puccinia: Pucciniaceae
Agaricus: Agaricaceae