Questions for 31 July Zoology

Q:-1 Write short notes on the following in 200 Words each 10X4-40
a) Scales in fishes
b) Jaw suspensorium in vertebrates
c) Endoskelton in fishes and amphibians
d) Respiratory organs in amphibians and reptilians comparative account

Q:-2 Discuss the evolution of heart with suitable diagrams and give detailed account of it in mammals. (20)

Q:-3 What is hardy weinberg law? In a large experimental Drosophila population, the fitness of a recessive phenotype is calculated to be 0.90, and the mutation rate to the recessive allele is 5 × 10−5. If the population is allowed to come to equilibrium, what allelic frequencies can be predicted? (5+10)

Q:-4 Discuss the origin of humans with suitable fossil descriptions. (20)

Comments

Post a Comment

More On Blog

CANAL SYSTEM IN Porifera

Image
Canal system in Porifera (sponges) Body of all sponges is the perforated by large number of apertures through which water enters Inside body and flows through a system of criss-crossing canals collectively forming the canal system which is a characteristic feature of poriferans. Following types of canal systems are found in sponges: Ascon type, with flagellated spongocoel Sycon type, with flagellated radial canals Leucon type, with flagellated chambers Rhagon type, with conical shape and broad base ASCON TYPE This is the simplest type of canal system and is found in  Leucosolenia  and other homocoela. Ostia are present on the surface of body and lead directly into the spongocoel, which is lined by flagellated choanocyte cells. Spongocoel opens to the outside through a narrow circular opening, the  osculum  located at the distal free end of the sponge body. Water enters through ostia into spongocoel and goes out of body through the  osculum . SYCO...
Read more

Parasitic adaptation of Taenia

Taenia Parasitic adaptations Tapeworms live as internal parasites and they have to make several adjustments for the same. The following are few of the adaptations made by these tapeworms to make their life easy in their hosts. Presence of enzymatic resistant covering A hard covering called as tegument covers the body of these tape worms. Tegument is enzyme resistant and it protects all the internal organs from the digestive actions of the alkaline fluids of the host. On the other hand tegument is permeable to water and other nutrients. Absence of locomotory organelles This parasite lacks organs for locomotion. As there is no need for any locomotory organs both the adult and larval forms lack cilia or flagella. Osmotic pressure The osmotic pressure inside the body is higher than that of the surrounding host tissue or fluid. This helps the parasite to reside conveniently in the host body. Presence of hooks and suckers for attachment For the attachment purpose a scolex...
Read more