Question

Lactobacillus is a bacteria that lives inside humans. These bacteria live on the nutrients from our bodies. They help to keep our gut clean and healthy. S. typhi is a bacteria that enters our bodies through contaminated food. This bacteria causes infections in the body. Based on this information, which two statements about the association between these bacteria and humans are true?

Answer 1

Answer:

Statement for Lactobacillus:

Bacteria and humans are in mutualism.

Statement for S. Typhi:

Bacteria and humans are in parasitism.

Explanation:

• Mutualism: A symbiotic relationship between two species when both get benefits from each other without harming each other.
• Hence Lactobacillus and humans both are benefited by each other. So its a mutualism.
• Parasitism: A relationship where one species get the benefit and others get harm.
• Here S.typhi lives in human and harms humans by infecting him/her.
• So its a parasitism.