Flatworms lack dedicated respiratory and circulatory systems...

'Flatworms lack dedicated respiratory and circulatory systems because A) none of their cells are far removed from the gastrovascular cavity or from the external environment B) they lack mesoderm as embryos and, therefore, lack the adult tissues derived from mesoderm C) their flame bulbs can carry out respiratory and circulatory functions D) their body cavity, a pseudocoelom, carries out these functions'

Transcript

00:02 Hi, in today's video we will be discussing about flatworms and why flatworms do not have a respiratory and circulatory system.

00:13 Flatworms are referred to as a soft -bodied organisms.

00:17 Their body is soft and they are named flat worms because they are flat in body structure.

00:24 They are flat in vertebrates.

00:26 They also do not have segments in the body, hence they are unsegmented organisms.

00:39 So in this question, we have four options given and we need to identify the correct one, which is correct description to say that by flatworm do not have a circulatory or a respiratory system.

00:54 So let's start with discussion of each option.

00:57 Option b is saying the embryo of flatworm.

01:01 Do not have a mesoderm do not have mesoderm and that is the reason they do not have a circulatory and respiratory system and this statement is incorrect because ambrio flatworm has three germ layers like any other embryo which include actoderm and endoderm and mesoderm and meosoderm all three germ layer are present in the embryo hence it is a incorrect option.

01:39 Coming to option c, option c is saying the flame bulbs, platform has flame bulbs and their flame bulbs carry out the function of circulatory respiratory system and that is where they do not have a well organized or well developed circulatory respiratory system is incorrect because flame bulbs carries out function of excretory system.

02:06 They do not carry out the respiratory system.

02:08 They do not carry out the system function or circulatory system functions.

02:14 Hence it is also an incorrect option.

02:17 Coming to option d, option d is saying the body cavity and pseudo siloam carry out this function...

Question

Please give Ace some feedback