Question
Answers

Yellow rust of Gramineae is caused by
A)Cystopus
B)Albugo
C)Cythium
D)Puccinia

Answer
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Hint: Yellow rust is also known as stripe yellow rust of the wheat, it is also a serious disease of the wheat it can occur in any area of the wheat that can be growing in any weather. The Microorganism responsible for causing this type of disease is Basidiomycetes fungi.

Complete answer:
Rusts: They are characterised by the formation of rusty pustules containing the spores. Puccinia graminis tritici - Black rust of wheat. Puccinia glumarum or P. striiformis - Yellow rust of wheat. P. recondita - Brown rust of wheat

Now let us find solution from given options:
Cystopus : it is another name of albugo candida and is responsible for causing white rust of crucifers and is characterised by the appearance of irregular white blisters on the leaves and stems.
Albugo : Albugo candida (Cystopus candidus) is responsible for causing white rust of crucifers and is characterised by the appearance of irregular white blisters on the leaves and stems.
Cythium : it is a parasitic oomycetes. It causes damping of disease in the seedling of tomato, chillies and mustard.
Puccinia : Puccinia is heteroecious obligate parasite which completes its life cycle on two hosts; Primary host-wheat Secondary or alternate host-basberry It has macrocyclic life cycle with five types of spores: uredospores (n + n), teleutospores (n+ n) on wheat plant, basidiospore (n) in soil, pycniospores (n) and aeciospores (n + n) on barberry leaf.

Hence, the correct answer is option (D)

Note: Basidiomycetes are the most advanced and most commonly seen fungi. They are among the best three composers of the wood. They are able to decompose both cellulose and lignin. Lignin is not metabolised by any other kind of fungi, and not even by the bacteria, only these Fungi are responsible for the decomposition of the Lignin.