World Mosquito day is celebrated on

[HDquiz quiz = “1968”]

Every year World Mosquito day is observed on the 20th of August throughout the world commemorating the discovery of the presence of malarial parasite (Plasmodium sp.) in the gut of female anopheles mosquito by Ronald Ross in 1897. he received the Nobel prize in Physiology and Medicine in 1902 for his discovery.

During amplification of gene using PCR, Taq polymerase is used between

[HDquiz quiz = "1967"]

Polymerase chain reaction or PCR is a technique to amplify a specific segment of DNA using a pair of primers and Taq DNA polymerase enzyme. The binding of primers on the DNA segment is called the Annealing. After annealing of primers, the Taq DNA polymerase binds and extends the DNA fragments. Therefore, Taq DNA polymerase is used between Annealing and Extension.

Which of the following is a non-symbiotic biofertilizer?

[HDquiz quiz = "1966"]

Non-symbiotic nitrogen-fixing bacteria are nitrogen-fixing bacteria that are free-living soil bacteria and are not directly associated with plants. These bacteria fix nitrogen from the atmosphere and provide it to the crop plants. Examples of free-living non-symbiotic nitrogen-fixing bacteria are Azotobacter, Azospirillum, etc.

In barley stem, vascular bundles are

[HDquiz quiz = “1965”]

Barley (Hordeum vulgare) is a monocot plant belonging to the Family Poaceae. The vascular bundles are closed type as the cambium is absent. Further, the vascular bundles are scattered throughout the ground tissue. The vascular bundle contains Xylem (present toward the inner surface) and Phloem (present toward the outer surface).

During an injury nasal septum gets damaged. For it’s recovery which cartilage is preferred?

[HDquiz quiz = “1964”]

Internally, the nasal septum divides the nasal cavity into the right and left sides. The nasal septum is made up of bone and cartilage. The cartilage portion of the nasal septum is the hyaline type of cartilage. Apart from the nasal septum, hyaline cartilage is also present in the larynx, trachea, etc. Therefore, if the nasal septum gets damaged, hyaline cartilage will be preferred.

Polysome is formed by

[HDquiz quiz = “1963”]

A polyribosome or polysome is the attachment of many ribosomes to an mRNA during translation or protein synthesis. Under the microscope, polyribosomes are visualized as “beads” on a “thread”. It is formed during the elongation phase of the translation. Polysomes are formed both in prokaryotes and eukaryotes.

A water fem which is used as green manure in rice fields is:

[HDquiz quiz = “1962”]

Azolla is a genus of aquatic fern. Azolla is also known as water fern, duckweed fern, or mosquito fern. Azolla belongs to the Salviniaceae family. Azolla is a weed and they grow very fast in a favorable environment. In rice fields, Azolla sps. are used as green manure. Azolla species contain the blue-green algae Anabaena. Anabaena is able to fix atmospheric nitrogen and provide it to the host Azolla. Upon decomposition, Azolla provides nitrogenous manure to the rice plant.

ELISA is used to detect viruses where the key reagent is:

[HDquiz quiz = “1960”]

ELISA or the enzyme-linked immunosorbent assay is a biochemical technique widely used in the research and medical field to detect the presence of specific proteins or biomolecules. In the ELISA test, two antibodies are required i.e. the primary antibody detects the presence of the specific molecule and the secondary antibody that detects the primary antibody. For visualization, the secondary antibody is conjugated with an enzyme. The enzyme may be the horseradish peroxidase or the alkaline phosphatase.

The phagocytic cell present in the kidney is

[HDquiz quiz = “1959”]

The macrophage-like phagocytic cell present in the kidney is called Mesangial cells. Mesangial cells are located in the glomerular capillaries of the renal corpuscle in the kidney. They are derived from smooth muscles and phagocytize components of the glomerular basal lamina. Apart from phagocytic functions, they also provide structural support to the glomerular capillaries and regulate glomerular filtration.