Which is the particular type of drug that is obtained from the plant whose one flowering branch is shown below? 
The plant illustrated in diagram is Datura which has hallucinogenic properties. Hallucinogen is a substance that produces psychological effects normally associated only with dreams, schizophrenia, or religious visions. It produces changes in perception (ranging from distortions in what is sensed to perceptions of objects where there are none), thought, and feeling.
At which stage of HIV infection does one usually show symptoms of AIDS:- 
In many patients, symptoms of HIV infection do not occur until stage 3 of the infection. HIV selectively destroys helper T-lymphocytes. It, therefore, causes symptoms of immunodeficiency due to a critically low number of helper T-lymphocytes.
Stage 3 is usually a period where the severity and frequency of these infections and neoplasms are directly related to the decline of CD4+ T cells or helper T-lymphocytes.
Thus, the correct answer is, 'When HIV damages a large number of helper T- Lymphocytes'.
Which of the following is not a sexually transmitted disease ? [2015 RS]
► Encephalitis is a disease of inflammation of the brain. It is not transmitted sexually. Most commonly it is caused by a virus.
► Syphilis is a bacterial infection usually spread by sexual contact. The disease starts as a painless sore — typically on your genitals, rectum or mouth. Syphilis spreads from person to person via skin or mucous membrane contact with these sores.
► Trichomoniasis (or “trich”) is a very common sexually transmitted disease (STD). It is caused by infection with a protozoan parasite called Trichomonas vaginalis.
► AIDS (Acquired Immune Deficiency Syndrome) is the final and most serious stage of HIV disease, which causes severe damage to the immune system.
HIV has been found in saliva, tears, nervous system tissue, blood, semen (including pre-seminal fluid, or "pre-cum"), vaginal fluid, and breast milk. However, only blood, semen, vaginal secretions, and breast milk have been proven to transmit infection to others.
Transmission of the virus occurs:
HIV that causes AIDS, first starts destroying: [2015 RS]
After infection, HIV starts to destroy the T cells (T-helper lymphocytes). T cells are very important for the immune system. In the early stage of infection, the decline in numbers of T cells is observed.
The active form of Entamoeba histolytica feeds upon: [2015 RS]
The trophozoites of Entalmoeba secretes proteolytic enzymes which partially dissolves and loosens the mucosa, submucosa and blood capillaries of the colon wall. On entering the colon, it actively ingests intestinal tissues and RBC's.
Serious damage ulceration are observed in the colon wall. This, E. histolytica feeds on erythrocyte, mucosa, and submucosa of colon which leads to amoebiasis.
Which of the following viruses is not transferred through semen of an infected male? [2015 RS]
Ebola virus has been detected in blood and many body fluids. Body fluids include saliva, mucus, vomit, feces, sweat, tears, breast milk, urine, semen, and vaginal fluids. HIV is transmitted through blood, semen, breast milk and other body fluids. Hepatitis B is usually spread through blood, semen, or other body fluids from a person infected with the virus. Chikungunya is an infection caused by the chikungunya virus. It is a viral disease transmitted to humans by infected mosquitoes.
Match each disease with its correct type of vaccine: [2015 RS]
Which of the following endoparasites of humans does show viviparity ? [2015 RS]
Trichinella spiralis is an endoparasite found in human intestine. It is the smallest nematode producing larvae in large number.These larvae bore the intestine of human being and enter the blood and lymphatic systems.
Which one of the following immunoglobulins does constitute the largest percentage in human milk? [2015 RS]
Colostrum contains high levels of lgA, which gives passive immunity to foetus.
If you suspect major deficiency of antibodies in a person, to which of the following would you look for confirmatory evidences? [2015 RS]
Serum globulins test provides confirmatory evidence measuring the deficiency of antibodies ( γ -globulin) in a person.
Which of the following diseases is caused by a protozoan ? [2015 RS]
Babesiosis is malaria like disease caused by protozoon-Babesia. In this desease haemoglobinuric fever takes place.
MALT constitutes about________per cent of the lymphoid tissue in human body.
Mucosa Associated Lymphoid Tissue constitutes about 50% of the lymphoid tissue in human body. It is scattered along mucosal lining in the human body. There are three types of situations in which MALT is present Tonsils, Appendix, & small intestine area.
Grafted kidney may be rejected in a patient due to : [2015 RS]
In graft rejection, grafts of a kidney, heart, lung, liver, etc. from one human to another always (unless donated by an identical twin) are seen by the recipient's immune system as antigenic (foreign) and elicit an immune response. If unchecked, this response will eventually lead to the destruction of the graft. Both CD4+ and CD8+ T cells participate in graft rejection. T cells (lymphocytes) bind to the surface of other cells that display the antigen and trigger a response.
So, the correct answer is option A.
Asthma may be attributed to
A mast cell or a mastocyte is typically a white blood cell. It is a special kind of granulocyte, which is a part of the immune system and laden with histamine and heparin. Besides these, mast cells also secrete the prostaglandin (PG) D2, and leukotriene (LT) C4, which are capable of inducing bronchoconstriction and mucosal edema, both features of asthma.
In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to 
An autoimmune disease is a pathological state arising from an abnormal immune response of the body to substances and tissues that are normally present in the body
Which part of the tobacco plant is infected by Meloidogyne incognita ? 
Meloidogyne incognita is a nematode (roundworm) in the family Heteroderidae. It is commonly called the "southern rootknot nematode" or the "cotton root-knot nematode".
Antivenom injection contains preformed antibodies while polio drops that are administered into the body contain 
Antivenom injection is an antiserum (preformed antibodies) which is obtained from the snake poison and it is transferred to the person with a snake bite. It is used to provide immediate immunity in case of emergency.
Polio vaccines are vaccines used to prevent poliomyelitis (polio). Two types are used - an inactivated poliovirus (antigen) given by injection and an attenuated poliovirus (antigen) given by mouth. The inactivated polio vaccines are very safe. Mild redness or pain may occur at the site of injection. Oral polio vaccines cause vaccine-associated paralytic poliomyelitis.
So, the correct answer is 'Attenuated pathogens'.