First to occur during secondary growth of a dicot root is
Which of the following is a matching pair
Iron porphyrin occurs in
A vein possesses a large lumen because
Veins have larger diameters and thinner walls as compared to arteries.
So veins have larger lumens and contribute capacitance to the circulation, holding approximately two thirds of all circulating blood.
The intima and adventitia are similar in structure and function to arteries but the media is much thinner due to significantly less smooth muscle and elastic tissue.
Veins therefore do not have the same capacity for elastic recoil and vasoconstriction as arteries.
Blood is propelled forward by contraction of surrounding muscles and pressure gradients created during inspiration and expiration.
Bacterial ribosomes lie in
Chloroplasts are self replicating units as they possess
The process of micropropagation is the formation of new plants from
Mr. X is eating curd/yoghurt. For this food intake, in a food chain he is considered as occupying
Dinsaurs were dominant during
Which of the following is not included in coenozoic era?
The genetic code is found in
Which of the following lies between replication and translocation ?
Evolution of a species or group can be studied through
Which one is not produced in Escherichia coli present in lactose medium?
A gamete normally contains :
A genetically diseased male marries a normal female producing three diseased girls and five normal sons. It would be a
In sickle cell anaemia, death occurs when lethal genes are present in
In a cross between heterozygous tall(Tt) and homozygous tall (TT), there is a progeny of 12. How many of them would be tall
AIDS Virus has
A blood group has both A and B antigens but no antibodies. It is
Palmately compound leaf
The vascular cambium and cork cambium are the examples of
Gradient of turgor pressure as the possible mechaninsm of nutrient transpiration was given by
Nitrogen fixation occurs in
The restriction enzymes are used in genetic engineering because they
Photosynthates are transported through
The decomposition of domestic wastes, under natural process, is known as
Which of the following metal is pollutant that causes sterility in human beings?
Manganese pollution causes sterility. It is found in water bodies which come from thermal power plants and fungicides.
Entamoeba histolytica infection occurs through :
Green-house effect is due to
The presence of human chorionic gonadotropin (HCG) in a woman’s urine indicates that she
The largest plant belongs to
Variations giving rise to new species are serialised by the process of
Darwin wrote "Origin of Species" in
Which of the following organelles is found in large numbers in the cells, which line the proximal convoluted tubule?
Mule is a product of
The inability to regulate the concentration of sodium ions in the blood could be due to improper functioning of the