CBSE Questions for Class 11 Medical Biology Biological Classification Quiz 3 - MCQExams.com

• Ainsworth G. C. classification of fungi is based on morphology, especially of reproductive structure.
• He placed Rhizopus in class Zygomycetes.
• Rhizopus species mostly are saprobic (decomposers) and feed on a variety of dead organic matter, though some species are also parasitic or pathogenic.
  
• The body of Rhizopus is branched and composed of three types of hyphae: stolons, rhizoids, and usually unbranching sporangiophores. 
• Mycelium is aseptate and multinucleate (coenocytic mycelium).

Cleistothecium is actually the spherical fruiting body in penicillium and aspergillus. It is actually the container of the sexual spores called ascospores. Cleistothecia must rupture or disintegrate to release their ascospores. 

The correct answer is C.

The largest virus is the pox virus, around 250 to 300 microns. The infectious viral particles have the enzymes required for replication within the virion and hence, the virus has a large size. These viruses are different from other viruses in their ability to replicate inside the infected cytoplasm independently. So, the correct answer is option C.

• Phylum virus is divided into two sub-phylum:- 

• Bacteriophages are viruses that infect bacteria. 
• The $$T_4$$ phage that infects the bacterium Escherichia coli consists of a polyhedral head attached to a helical tail, a shape commonly found in bacteriophages.
• Many phages have tail fibers that attach to the host cell.
• So, the correct answer is 'A - Head, B - Sheath, C - Collar, D - Tail fibres'.

• Fungi are heterotrophic eukaryotic organisms. Fungi are unable to make their own food material because of the absence of chlorophyll.
• Phagocytic mode of nutrition includes engulfment of solid material using pseudopodia. Fungi do not show a phagocytic mode of nutrition. 
• Pinocytosis mode of nutrition involves the engulfment of liquid or small particles by forming an invagination around it and forming a small vesicle. Fungi do not show the pinocytic mode of nutrition. 
• Fungi obtain nutrients from dead, organic matter. Fungi release digestive enzymes to break down complex food into a simple form of food. Such, simple form of food is utilized by fungi. This is the saprophytic mode of nutrition.

• The fungal cell wall shows the presence of chitin. 
• Since they are eukaryotes, they possess a well-defined nucleus with a nuclear membrane. 
• They are made of filamentous structures called hyphae.
• However fungi do not have chlorophyll as they are heterotrophic, i.e., they can not synthesize their own food. They are either saprophytes or parasites.

Bacteria reproduce by binary fission. This is a simple division of the parent cell in two daughter cells, which are the clone of the parent cell. Other than that, Animals, Plants and Fungi depend on asexual and sexual reproduction to exchange genetic information.

The correct answer is C.