Advertisements
Advertisements
प्रश्न
Explain general characteristics of phylum Platyhelminthes.
Advertisements
उत्तर
(i) Their body is bilaterally symmetrical and dorsoventrally flattened.
(ii) They are acoelomate and triploblastic animals i.e. their tissues differentiate from three embryonic germ layers.
(iii) Circulatory and respiratory systems and skeleton are absent.
(iv) Their excretory system consists of blind tubules called protonephridia. Blind end of a tubule bears a tuft of cilia or a flagellum called the flame cell.
(v) They are hermaphrodites i.e. both male and female reproductive organs occur in the same individual.
APPEARS IN
संबंधित प्रश्न
What are the differences between animals belonging to the Aves group and those in the mammalia group?
What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
Match the following:
| Column I | Column II | ||
| (a) | Operculum | (i) | Ctenophora |
| (b) | Parapodia | (ii) | Mollusca |
| (c) | Scales | (iii) | Porifera |
| (d) | Comb plates | (iv) | Reptilia |
| (e) | Radula | (v) | Annelida |
| (f) | Hairs | (vi) | Cyclostomata and Chondrichthyes |
| (g) | Choanocytes | (vii) | Mammalia |
| (h) | Gill slits | (viii) | Osteichthyes |
Match the animals given under column A with their respective classification group given under column B
| Column A | Column B | ||
| 1 | Sponge | a | Amphibia |
| 2 | Snail | b | Reptilia |
| 3 | Butterfly | c | Echinodermata |
| 4 | Toad | d | Mollusca |
| 5 | Lizard | e | Arthropoda |
| 6 | Starfish | f | Porifera |
Write down four characteristics of Ctenophora.
Define the term hermaphrodite.
Write down four main characters of chordates.
Write short note on protochordates.
Describe general characteristics of phylum Annelida.
What are the group names of the following categories of animals?
Animals with a hairy skin ___________
Give any one difference between the following :
Flatworm and Roundworm
Name any two animals which possess compound eyes.
Give two examples of each of the following: Platyhelminthes
Give two examples of each of the following: Arthropoda
Fill in the blanks:
The excretory organs of platyhelminthes are ______.
Choose the correct answer: Mosquito is included in insects because
Choose the correct answer: Binomial Nomenclature was proposed by
Assertion: Binomial name is the universal name and contains two names.
Reason: It was first introduced by Carolus Linnaeus
What is binomial nomenclature?
