Question

QUESTION 29 What is a disadvantage of being an Ecto-parasite? Vulnerable to natural enemies. Exposed to an uncertain external environment. Feeding can be more difficult. Answers A, B, &C are all disadvantages of being an Ecto-parasite. O None of the above answers are correct. QUESTION 30 Which of the following mutualists cannot survive without the symbiotic interaction? obligatory symbiont trophic mutualist dispersive mutualist facultative mutualist Onone of the above

Answer 1

27. symbiosis is the the intimate and protracted association between 2 or more organisms of different species.

mutualism is the the interaction between two different species in which both get benefits.

commensalism is the associartion between two different species inwhich one get benefits and otheris unaffected, neither benefit nor harm.

parasitism is the relationship between two species in which one gets benefits and other gets harm.

28. the host population evolves to become more susceptable to parasite.  usually after a long term parasitic interaction host evolves stronger defenc against parasite. the samw way parasites eveolve to avoid the defence mechanaism by host.

29. A,B and C are all disadvantages of being ecto parasite. being an ecto parasite is more vulnarable to natural enemies because it is exposed to the outer environment. Fedding is also more difficult compared to the endoparasites which absorbe food more easily from the host.

30. Obligate symbiosis is a type of association in which  two organisms are in symbiotic relationship and they can't survive without each other

Trophic mutualism is the transfer of energy between two species.

Dispersive Mutualism is the association in which the pollinating agent get food from flower for pollinating.

facultative mutualism is a type of mutualism in which the interacting species get benefit from each other but they are not fully dependent to each other.