NTA Abhyas NEET2020BotanyAnimal KingdomPractice
Which of the following statements is incorrect?
Options
- AThe body of platyhelminthes bears suckers and most of them are endoparasites.
- BThe sedimentary form of colentrata is polyp.
- CClosed circulatory system, respiratory pigment dissolved in plasma and setae are the unique features of anneli
- DSpiny skin, closed circulatory system and developed sense organs are present in echinodermata.
Correct answer
D. Spiny skin, closed circulatory system and developed sense organs are present in echinodermata.
Step-by-step solution
Almost 80 % of the flatworms are parasitic in nature, while few are free living platyhelminthes. The free-living forms are scavengers or predators. The parasitic species feed on the tissues of the host organism in which they live. Hooks and suckers are present in parasitic forms. Coelentrata exhibit 2 forms sessile polyp forms and swimming medusa forms. They have a well-developed circulatory and digestive system. Body contains haemoglobin, which gives them a red colour.