Nematodes: Characteristics and Impact

Nematodes, or roundworms, are abundant and diverse organisms found in various habitats. They play crucial ecological roles, from nutrient cycling to pest control. Nematodes exhibit unique anatomical features and reproductive strategies. While some are beneficial, others are agricultural pests. C. elegans, a model organism, has significantly contributed to scientific research.

What is the estimated number of nematodes for every human on Earth?

• 57-60 billion

• 10 million

• 100 billion

• 1 trillion

Which environment is NOT mentioned as a habitat for nematodes?

• Polar regions

• Freshwater

• Mountains

• Deserts

What percentage of nematode species are parasitic?

• 50%

• 10%

• 75%

• 25%

Which of the following is a characteristic feature of nematodes?

• Segmented body

• Eutely or cell constancy

• Presence of cilia

• Radial symmetry

How do nematodes move food through their digestive system?

• With a muscular intestine

• Through cilia

• By body movements

• Using stomach muscles

What role do nematodes play in soil ecosystems?

• They decompose organic matter

• They fix nitrogen

• They are primary producers

• They are top predators

Which nematode is known for surviving in extreme pH conditions?

• Filarial worm

• C. elegans

• Vinegar eel

• Root knot nematode

What is a significant agricultural impact of root knot nematodes?

• They pollinate crops

• They block water and nutrient flow

• They fix atmospheric nitrogen

• They enhance plant growth

What makes C. elegans a valuable model organism in research?

• Its large size

• Its complex nervous system

• Its completely mapped genome

• Its ability to photosynthesize

In which field has C. elegans NOT been used as a model organism?

• Aging studies

• Photosynthesis research

• Spaceflight research

• Gene function studies