I know the answer is B) by flagella. But can somebody explain why B is correct a
ID: 63848 • Letter: I
Question
I know the answer is B) by flagella. But can somebody explain why B is correct answer? Thanks
For several decades now, amphibian species worldwide have been in decline. A significant proportion of the decline seems to be due to the spread of the chytrid fungus, Batrachochytrium dendrobatidis (Bd). Chytrid sporangia reside within the epidermal cells of infected animals, animals that consequently show areas of sloughed skin. They can also be lethargic, which is expressed through failure to hide and failure to flee. The infection cycle typically takes four to five days, at the end of which zoospores are released from sporangia into the environment. In some amphibian species, mortality rates approach 100%; other species seem able to survive the infection. 70) Apart from direct amphibian-to-amphibian contact, what is the most likely means by which the zoospores spread from one free-living amphibian to another? A) by wind-blown spores B) by flagella C) by cilia D) by pseudopods E) by hyphaeExplanation / Answer
Generally speaking spores are of two types motile and non motile spores. The motility of a spore helps in swimming the spore towards a favorable environment, thereby germination and further development. Where as a non motile spore which lacks flagellum moves along with water current towards a new environment for further germination. The flagellar zoospores are asexual spores. Presence of flagellum is a characteristic feature of certain algae, fungi and bacteria. This flagellm helps in locomotion away from parent. They germinate mostly on moist places, that’s why they have selected the moist skin of amphibians. A wind blown spore is a characteristic feature of fungi, so it needs wind to distribute it from its parent for further germination. For example, mushrooms shoot their spores with considerable energy to long distances. Cilia is a characteristic feature of most eukaryotes are sensory in function and pseudopods are the characteristic of amoeboid organisms for the purpose of movement and catching the food. Hyphae are the characteristic feature of fungi and helps in vegetative growth by forming branched mycelim.