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T.Y.B.Sc. Question Bank -2 for practise

All the TYBSc. Zoology students, please click on the link below to go to the Question Bank-2 of Organic Evolution for practice purpose. Organic Evolution Question Bank-2 for Practice
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MICROSCOPES

SIMPLE MICROSCOPE A Simple microscope is commonly used in a laboratory. It is most usually used for dissection of small organisms or for getting the magnifying look at certain organs of organisms e.g. while studying mouthparts or insects. In a simple microscope single or group of convex lenses is used. A convex lens magnifies the object and helps to produce a magnified image. Magnification obtained by simple microscope can be calculated as Where D = the least distance of distinct vision             F = Focal Length of convex length This microscope can provide magnification only up to 3 times. In cases where greater magnification is required, more than one lens should be used. A Simple microscope consists of two parts viz. A.     Optical Part B.     Mechanical Part A.     Optical Part : It consists of a single convex lens B.  Mechanical Part : As the name suggests it provides the mechanical support to the microscope. It holds the lens at the proper posi

Starfish: External Characteristics

STARFISH SYSTEMATIC POSITION Kingdom: Animalia    Phylum: Echinodermata       Class: Asteroidae          Order: Forcipulata             Family: Asteriidae               Genus:   Asterias                  Species:   rubens HABIT & HABITAT: 1.        Asterias is exclusively marine in nature 2.        It is mostly found on sea costs and in shore waters 3.        It generally prefers rocky areas where locomotion and concealment is easier 4.        It is bottom dwelling benthoic organism 5.        It clings to submerged objects by firmly attaching to them. 6.        It is solitary in nature in normal conditions 7.        Asterias is strongly positive towards light whereas other genus are negative towards light 8.        It is carnivorous and voracious feeder 9.        It is nocturnal in nature 10.   It shows remarkable power of autotomy and regeneration EXTERNAL CHARACTERISTICS: A.        SIZE & SHAPE: 1.        Body is star