Which of these responses could be exspected of an endothermic a sweating b. pant

Question

Which of these responses could be exspected of an endothermic a sweating b. panting (as a dog does) animal on a coida moving into the shade d. coiling up their body into a ball e. slower metabolism 48. Which would be the most effective response of mammals, including humans,to led body temperature? a. ice cold water applied to lower body b. cool water applied to feet, hands, and face c. drink ice water d. put on a hat e, move rapidly to generate air currents 49. One advantage of an exoskeleton over an endoskeleton is a. it provides a structure for muscle attachment b. the skeleton provides levers for rapid movement c. protection of body tissues d. no need to molt e. no energy cost to producing it S0. To osmoregulate in fresh water, a fish mustsalts and produce large amounts of urine. a. conserve; dilute b. excrete; concentrated c. conserve: concentrated d. excrete; dilute e. absorb; concentrated Which of the following features is NOT found in the chordate lineage? a. Bilateral symmetry b. A dorsal hollow nerve cord C. An external skeleton d. Pharyngeal slits at some stage during development e. A notochord at some stage during development 51. 52. Which of the following is a trait common to most of the protostomes? a. Dorsal nervous system b. Posterior brain c hermaphrodism d. Development of a mouth from a blastopore e asexual reproduction 53. The evolution of a chitinous exoskeleton affected many aspects of arthropod evolution. From the following list, select the aspect that was least affected. a. Specialization of function among the body parts b. Mode of locomotion c. Pattern of growth d. Type of gas exchange system e. Mode of digestion

Explanation / Answer

47)endotherms are organisms,which maintain body at metabolically favourable temperatures,by the heat produced by internal mechanisms.

Answer is option D

Coiling up their body into ball.

On cold days,endotherms apply special mechanisms to keep body warmer like shivering,coiling,rubbing hands etc..,

48)Answer is option B

Most effective response by endotherms on body elevated temperatures:

The organism must stay put and rest well,not to further increase it's temperature.

As it refers to temporary increase in body temperatures cooling the body extremeties is best way to get normal.

Ice cold water should not be used as they suffers from instant temperature changes if given.

49)Answer is option C

Exokseleton is disdvatageous than endoskleton in many ways.

As they molt,it takes so much energy to molt.

After molting till exoskeleton hardens its body tissues are left unprotected from infections,damage etc..,

One advantage is fully developed exoskeleton protects body tissues.the other options A and B are functions endoskeleton of humans.

50)Answer is option A

osmoregulatorstightly regulate the body osmolarity,which always stay constant irrespective of environment.

In freshwater lakes,the fish are hyperosmotic to lake. So the water moves from lake into fish.so,additional water must be remived. So the freshwater fishes more dilute urine.

Ions are lost by diffusion.

While excreting ions must be conserved. As the large amount of water is excreted there is possiblity of loss of ions.

Salt ions must be conserved by foods,and taken up by gills also.

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