The graph below shows the results of a laboratory investigation which measured the body temperatures of a lizard and a bird under changing artificial conditions. Use it to answer the question.
Which of the statements below is valid?
The bird's blood was always warmer than that of the lizard
The body temperature of the bird varied less than that of the lizard during changes in environmental temperature
The body temperature of the bird remained constant despite changes in environmental temperature
The body temperature of the lizard was always close to that of the environmental temperature
Correct answer is B
No explanation has been provided for this answer.
Which of the following features is not a characteristic of arteries? Arteries
possess valves at internals throughout their length
have thick muscular and elastic walls
carry blood away from the heart
transport oxygenated blood with the exception of the pulmonary artery
Correct answer is A
*Caries blood away from heart
*Thick, muscular, elastic wall
*Blood is at high pressure and flows fast in spurts(pulse waves)
*Valves absent (except for semi-lunar valves near the heart)
*Blood is oxygenated (except that is pulmonary arteries)
Which of the following groups of organisms has kidney as the excretory organ?
Fishes, amphibians, birds, man
Fishes, amphibians, annelids, insects
Fishes, reptiles, birds, tapeworm
Fishes, protozoans, amphibians, man
Correct answer is A
All of the organisms listed in option A use kidneys as their excretory organ.
The reason why the flow of blood through the capillaries is very slow is
because the walls of Capillaries are very thick
to avoid high blood pressure
to ensure that the individual does not get dizzy
Their large numbers and one cell-thick walls enables them to provide a large surface area through which materials can be exchanged between the blood and the body cells
Correct answer is D
Their large numbers and one cell-thick walls enables them to provide a large surface area through which materials can be exchanged between the blood and the body cells.
Which of the following structures is not a skeletal material?
Chitin
Cartilage
Bone
Muscle
Correct answer is D
No explanation has been provided for this answer.
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