Question

Fill in the blanks:
$a$. Simple organisms like sponges and coelenterates circulate $1$_____ from their surroundings through their body cavities to facilitate the cells to exchange of $O_2,CO_2$, nutrients and waste products.
$b$. More complex organisms use special fluids within their bodies to transport such materials. The $2$_____ is most commonly used body fluid by most of the higher organisms including humans for this purpose.
$c$. Another body fluid $3$_____ also helps in the transport of certain substances.

• A. $1$—lymph, $2$—water, $3$—blood
• B. $3$—lymph, $1$—water, $2$—blood
• C. $2$—lymph, $3$—water, $1$—blood
• D. $2$—lymph, $1$—water, $3$—blood

Answer 1

Answer: (B)

a. Simple organisms like sponges and coelenterates circulate water from their surroundings through their body cavities to facilitate the cells to exchange of $O_2,CO_2$, nutrients and waste products.
b. More complex organisms use special fluids within their bodies to transport such materials. The blood is most commonly used body fluid by most o f the higher organisms including humans for this purpose.
c. Another body fluid, lymph also helps in the transport of certain substances