Question

Question 21 (1 point) Which of the following animals is not classified as a mandibulate? spider crab insect millipede

Answer 1

QUESTION 21 ANS . SPIDERS

.MANDIBULATES COMES UNDER THE PHYLUM ARHTROPODA. MANDIBULATES ARE THOSE ORGANISMS WHICH CONTAIN MANDIBLES. MANDIBLES ARE JAW LIKE APPENDAGES WHICH ARE PRESENT ONLY IN PHYLUM ARTHROPODA. BUT NOT ALL CLASSES OF PHYLUM ARHTROPODA CONTAIN MANDIBLES. MANSDIBLES ARE USUALLY USED FOR CHEWING THE FOOD MATERIALS. AMONG THESE ORGANISMS SPIDERS LACK MANDIBLES. ALL OTHERS CRAB AND MILLIPEDES CONTAIN MANDIBLES. SPIDERS COMES UNDER THE CLASS ARACHINIDA. ARACHINIDS DOES NOT CONTAIN MANDIBLES.

QUESTION. 32. LEECH.

LEECHES ARE THE ORGANISMS WHICH CAN LIVE ON WATER AND ON LAND . THEY SUCK BLOOD FROM FROGS , LIZZRADS , BIRDS AND ALSO HUMANS. LEECHES COMES UNDER THE PHYLUM ANNELIDA AND CLASS CITELLATA.THERE ARE ONLY TWO PARASITES AMONG THE OPTIONS LEECH AND TAPWORM . TAPWORMS LIVES IN THE INTESTINE OF HUMANS..TAPWORM DOES NOT SUCK BLOOD. SPIDERS AND SEA ANEMONE ARE NOT PARASITES.

QUESTION . 37. ANS . EARTHWORM.

ECDYSIS IS THE PROCESS OF MOULTING OF THE CUTICLE OR CHANGING THE CUTICLE WITH A NEW ONE.ECDYSOZOANS ARE THOSE ORGANISMS WHICH POSSES ECDYSIS. ECDYSOZOANS PERIODICALLY CHANGES THEIR SKIN OR CUTICLE WHEN THEY GROW.ECDYAOZOANS INCLUDE INVETEBRATE  ORGANISMS UNDER ANNELIDS , ARHTROPDA , MOLLUSCA AND SOME VERTEBRATES LIKE SNAKES. AMONG THESE OPTIONS ONLY EARTHWORMS POSSES ECDYSIS. SPIDERS, OCTOPUS AND JELLYFISHES DOES NOT PERFORM ECDYSIS.

QUESTION 38. ANS. ANTHOZOANS.

POLYP AND MEDUSAE ARE TWO BODYFPRMS OF ORGANISMS UNDER THE PHYLUM COELENTERATA. POLYPS ARE SESSILE AND CYLINDRICAL FORM EXAMPLE HYDRA AND ADAMASIA. MEDUSAE ARE FREE SWIMMING AND UMBRELLA SHAPED EXAMPLE JELLYFISH.THOSE COELENTERATES WHICH POSSES THE TWO BODYFORMS ARE SAID TO EXHIBIT ALTERNATION OF GENERATION . THAT IS POLYPS PRODUCE MEDUSAE ASEXUALLY AND MEDUSAE PRODUCE POLYPS SEXUALLY. AMONG THESE OPTIONS CLASS ANTHOZOANS HAS ONLY POLYP BODY PALN . CLASS ANTHOZOANS DOESNOT POSSES MEDUSAE  BODYPLAN. MOST OF THE SPECIES UNDER CLASSES HYDROZOANS, SCYPHOZOANS AND CUBOZOANS POSSES BOTH POLYP AND MEDUSAE BODY PLAN