Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant heparin?
Neutrophils
Basophils
Eosinophils
Monocytes
B.
Basophils
The basophils are probably like mast cells of connective tissue. They release heparin histamine and serotonin. Their nucleus is usually three-lobed and their granules take basic stain strongly.
Monocytes are the largest of all types of leucocytes. Their nucleus is bean-shaped. They are motile and phagocytic in nature. They engulf bacteria and cellular debris. Generally, they will change into macrophages after entering tissue spaces. Eosinophils have a two-lobed nucleus. They are non-phagocytic and help in dissolving a blood clot. Their number increases in people with allergic conditions such as asthma or high fever.
Neutrophils are most numerous of all leucocytes They eat harmful germs and are, therefore, phagocytic in nature. Their nucleus is many lobed and strain weakly with both and basic stains.
Bilateral symmetry, metameric segmentation, coelom and open circulatory system are the features of
Annelida
Arthropoda
Mollusca
Echinodermata
If a child is of O blood group and his father is of B blood group, the genotype of father is
IO IO
IA IB
IO IB
IO IA
Correctly matched set of phylum, class and example is
Protozoa-Mastigophora-Entamoeba
Mollusca=-Bivalvia-c-Pmcrcdc
Arthropoda-Diplopoda-Scolopendra
Chordata-Cyclostomata-Phrynosoma
Which one of the following in birds, indicates, their reptilian ancestry?
Scales on their hindlimbs
Four-chambered heart
Two special chambers crop and gizzard in their digestive tract
Eggs with a calcareous shell
Select incorrect pair
Porifera – Choanocytes
Coelenterata – Nematocysts
Annelida – Segmentation
Monera – Eukaryote
