BIOLOGY ZNOTES

Various forms of Pearls Pearls are formed within the vanquish of live  pearl oyster (e.g. Pinctada).   They come Read more

Sex chromosomes together with Autosomes Most of the diploid organisms are amongst dissever sexes. The organisms producing sperms are called males and those producing eggs (ova) are called females.  Chromosome is the major ingredient to decide the sexual practice of an organism.  The chromosomes that are involved inwards sexual practice conclusion are called  sex chromosomes (allosomes).  They include  X & Y chromosomes.  Autosomes are chromosomes other than sexual practice chromosomes. Number of autosomes is same inwards males together with females. Henking (1891) studied spermatogenesis inwards simply about insects together with observed that fifty % of sperm received a nuclear construction later spermatogenesis, whereas other fifty % sperm did non have it. Henking called this construction every bit the X body. Later it is called every bit X-chromosome. Mechanism of sexual practice conclusion XX-XO mechanism: Here, manly individual...

Differences between  Amphibians together with Reptiles Features Amphibians Reptiles Group They come upwards nether bird Amphibia They come upwards nether bird Reptilia Habit together with habitat They unremarkably remain well-nigh H2O sources to forestall drying out, together with bring smoothen skin. They are groups of animals that breathe air, bring scales on their bodies, together with lay eggs. Breathing Gills, peel together with lungs Lungs Metabolism Ectothermic (Poikilothermic or cold-blooded) Ectothermic (Poikilothermic or cold-Blooded) Metamorphosis Yes. Breathes H2O through gills until it develops lungs. No. Looks similar a miniature adult when born. Heart 3-chambered. Two atria together with i ventricle 3-chambered, 2 atria together with i ventricle. But ventricle i...

Animal Kingdom: Model Questions 1.        An animate beingness shows the next characters: ·       Body is dorso-ventrally flattened ·       Parenchyma cells are industrial plant life betwixt the body wall too alimentary canal ·       Flame cells are present ·       Body is unsegmented too bilaterally symmetrical. a.                     Name the phylum of this animal. b.                    Give an example. 2.        Give reasons for the next statements a.      Saliva of Leech contains an enzyme hirudin. b.     Sponges were before considered equally lifeless organisms c.    ...