Question

27) if an algae living inside their ascocarp hosts provides carbon for the ascocarp, then algae can be proproly considered to be

1. parasites.

2. mutualists.

3. commensals.

4 symbionts

1.      Endosymbionts

A) 1 and 4

B) 1 and 5

c) 3 and 4

d) 2 and 5

4) in the late 1880;s farmers discovered that spraying a mixture of lime and sulfur was very effective in controlling San Jose scale insects that previously ravaged their orchards. But by 1900, the lime- sulfur cure was failing and this insect pest returned to its initial abundance in the orchards. Which of the following statemnets best explains why the abundance of the San Jose scale insects reoccurred.

A) the farmers sloopily combined the line – sulfur mixture formula and started using an inferior mix

B) Natural selection caused the San Jose scale insects to mutate, creating a new line-sulfur resistant species.

C) lime-sulfur resistant scale insects were more likely to survive and reproduce

d) lime-sulfur resistant scale insects displayed less efficient photosyntheise metabolism

Answer 1

27. Ascocarp is providing shelter to algae, whereas carbon is provided by algae. Both are getting benefitted.

I think the algae can be considered as mutualists and symbionts.

Endosymbionts represent the organisms that live in a host cell permanently.

If the algae mentioned here have undergone endosymbiosis, they can be considered as endosymbionts.

4.

B) Natural selection caused the San Jose scale insects to mutate, creating a new line-sulfur resistant species.