Biological Classification – NEET Biology MCQs (Part 10)

Correct Answer: C

Kingdom Fungi is divided into four major classes based on features such as the morphology of the mycelium, the mode of spore formation and the nature of fruiting bodies. These structural and reproductive characteristics help scientists classify fungi into different groups for systematic study.

Correct Answer: B

Fungi are classified into four major classes based on characteristics such as mycelium structure, type of spores and fruiting bodies. These four classes are Phycomycetes, Ascomycetes, Basidiomycetes and Deuteromycetes. Each group has distinct structural and reproductive features that help scientists identify and study them.

Correct Answer: B

Phycomycetes are a group of fungi that are commonly found in aquatic environments and in moist, damp places such as decaying wood. Some members also live as obligate parasites on plants, meaning they depend entirely on the host plant for their nutrition. Because they prefer moist environments, they are frequently seen in water or on decaying organic matter.

Correct Answer: B

In Phycomycetes, the fungal mycelium consists of aseptate hyphae, meaning the hyphae lack cross walls or septa. As a result, the cytoplasm forms a continuous tube containing many nuclei. This type of hypha is called coenocytic. Because there are no septa dividing the hyphae into cells, the cytoplasm remains multinucleated throughout the mycelium.

Correct Answer: A

Phycomycetes include fungi such as Mucor, Rhizopus and Albugo. Mucor and Rhizopus are commonly found growing on moist bread and other decaying organic matter. Rhizopus is often referred to as bread mould. Albugo is a parasitic fungus that infects plants such as mustard and causes diseases like white rust. These fungi typically possess aseptate and coenocytic mycelium.

Correct Answer: A

Rhizopus is a fungus commonly known as bread mould because it frequently grows on moist bread and other decaying organic materials. It belongs to the group Phycomycetes and has aseptate, coenocytic hyphae. Rhizopus reproduces asexually through sporangiospores formed inside sporangia. Under suitable conditions, it grows rapidly on moist substrates such as bread.

Correct Answer: B

Albugo is a parasitic fungus belonging to the group Phycomycetes. It commonly infects mustard plants and causes a disease known as white rust. The infection produces white blister-like spots on the leaves and stems of the plant. As a parasite, Albugo obtains nutrients from the host plant, which may weaken the plant and reduce crop yield.

Correct Answer: B

Ascomycetes are commonly called sac fungi because their sexual spores, called ascospores, are produced inside sac-like structures known as asci. These fungi show great diversity and include both unicellular forms such as yeast and multicellular forms such as morels and truffles. Many members of this group are important in industries and agriculture.

Correct Answer: A

Most ascomycetes are multicellular fungi, such as Penicillium, which form filamentous mycelium. However, a few members of this group are unicellular. A common example is yeast (Saccharomyces), which exists as single cells and reproduces mainly by budding. Because of this variation, ascomycetes include both multicellular and unicellular forms, though multicellular forms are more common.

Correct Answer: B

Penicillium is a multicellular fungus belonging to the group Ascomycetes. It consists of filamentous hyphae that form a network called mycelium. Penicillium is well known for producing the antibiotic penicillin, which is used to treat bacterial infections. This fungus commonly grows on decaying organic matter and moist food materials.

Correct Answer: C

Yeast is a unicellular fungus belonging to the group Ascomycetes. Unlike most fungi that are multicellular and filamentous, yeast exists as single cells. It reproduces mainly by budding and is widely used in fermentation processes such as bread making and alcohol production. A common example of yeast is Saccharomyces.

Correct Answer: B

Saccharomyces is a genus of unicellular fungi commonly known as yeast. It belongs to the group Ascomycetes. Yeast reproduces mainly by budding and plays an important role in fermentation processes. It is widely used in baking and brewing industries for making bread, beer and wine because it converts sugars into alcohol and carbon dioxide.

Correct Answer: B

Ascomycetes, commonly called sac fungi, include both multicellular forms such as Penicillium and unicellular forms such as yeast (Saccharomyces). Most of them are saprophytic and act as decomposers of organic matter. Some species live as parasites on plants and animals, while others are coprophilous, meaning they grow on animal dung. Because of these different nutritional modes, ascomycetes play an important ecological role in nutrient recycling.

Correct Answer: A

Basidiomycetes are a group of fungi that include commonly known forms such as mushrooms, bracket fungi and puffballs. These fungi are mostly multicellular and form large fruiting bodies. They reproduce sexually by producing basidiospores on structures called basidia. Many basidiomycetes grow on soil, wood or decaying organic matter and play an important role in decomposition.

Correct Answer: B

Basidiomycetes are fungi that commonly grow in soil, on logs and on tree stumps where organic matter is available. Some species also live as parasites in living plant bodies. Parasitic basidiomycetes include fungi that cause plant diseases such as rusts and smuts. Because of their role in decomposing organic matter and sometimes causing plant diseases, they are ecologically and agriculturally important.

Correct Answer: B

Agaricus is a genus of fungi belonging to the group Basidiomycetes. It is commonly known as mushroom. Many species of Agaricus are edible and widely consumed as food. These fungi grow on soil rich in organic matter and reproduce by producing basidiospores on specialized structures called basidia.

Correct Answer: B

Ustilago is a genus of parasitic fungi belonging to the group Basidiomycetes. It is commonly known as smut fungus because it causes smut diseases in plants, especially cereal crops such as wheat, barley and maize. The infection results in black powdery masses of spores on the infected plant parts, reducing crop yield.

Correct Answer: A

Puccinia is a genus of parasitic fungi belonging to the group Basidiomycetes. It is commonly known as rust fungus because it causes rust diseases in many plants, especially wheat. The infected plants develop reddish-brown rust-like spots on their leaves and stems. These diseases can significantly reduce crop yield and are therefore agriculturally important.

Correct Answer: C

Deuteromycetes are commonly called imperfect fungi because their sexual stage of reproduction has not been observed. Only the asexual or vegetative stages are known for these fungi. They reproduce mainly by asexual spores called conidia. When the sexual stage of these fungi is discovered, they are often reclassified into other groups such as Ascomycetes or Basidiomycetes.

Correct Answer: B

Deuteromycetes are known as imperfect fungi because only their asexual or vegetative stages have been observed. Their sexual stage of reproduction has not been discovered. These fungi reproduce mainly through asexual spores called conidia. When the sexual stage of such fungi is later discovered, they are usually reclassified into other fungal groups such as Ascomycetes or Basidiomycetes.

Correct Answer: B

Members of Deuteromycetes may live as saprophytes or parasites. Many species act as decomposers of litter and dead organic matter present in soil. By breaking down complex organic substances into simpler compounds, they release minerals back into the soil. This process contributes to mineral cycling in ecosystems and helps maintain soil fertility.

Correct Answer: A

Deuteromycetes, also called imperfect fungi, include many species whose sexual stage is not known. These fungi reproduce mainly through asexual spores called conidia. Some common examples of Deuteromycetes are Alternaria, Colletotrichum and Trichoderma. Many of these fungi live as saprophytes, parasites or decomposers and play an important role in breaking down organic matter.