Zoology
- Hormones secreted by the placenta to maintain pregnancy are Answer: 2. hCG, hPL, progestogens, estrogens Key idea: The placenta works as a temporary endocrine gland. It secretes hCG, hPL (human placen... 1
- Which of the following features is used to identify a male cockroach from a female cockroach ? Answer: 3. Presence of caudal styles Key idea: Male and female cockroaches differ in the last abdominal segments. Males have a pair of threa... 1
- Which part of poppy plant is used to obtain the drug "Smack" ? Answer: 3. Latex Key idea: Smack (brown sugar, heroin) is made by acetylation of morphine. Morphine is obtained from the latex of the opium... 1
- Which of the following is not an autoimmune disease ? Answer: 2. Alzheimer's disease In an autoimmune disease the immune system attacks the body's own tissues. Psoriasis, rheumatoid arthritis an... 1
- In which disease does mosquito transmitted pathogen cause chronic inflammation of lymphatic vessels ? Answer: 1. Elephantiasis Key idea: Filarial worms (Wuchereria) are spread by Culex mosquitoes and live in lymphatic vessels. They cause chro... 1
- Among the following sets of examples for divergent evolution, select the incorrect option : Answer: 4. Eye of octopus, bat and man Key idea: Divergent evolution means homologous organs (same origin) adapted to different functions. O... 1
- The similarity of bone structure in the forelimbs of many vertebrates is an example of Answer: 1. Homology Key idea: Similar bone structure in the forelimbs of different vertebrates shows a common ancestral origin, which is hom... 1
- Which of the following is an amino acid derived hormone ? Answer: 1. Epinephrine Key idea: Hormones made from amino acids (amines, peptides, proteins) differ from steroid hormones made from choleste... 1
- Which of the following hormones can play a significant role in osteoporosis ? Answer: 2. Estrogen and Parathyroid hormone Key idea: Osteoporosis is loss of bone mass, linked to low estrogen and to calcium regulation. E... 1
- Which of the following structures or regions is incorrectly paired with its function ? Answer: 3. Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement. Key idea: Find the pair... 1
- The transparent lens in the human eye is held in its place by Answer: 1. ligaments attached to the ciliary body Key idea: The lens is suspended by the suspensory ligaments (zonular fibres). These ligame... 1
- In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is Answer: 4. Genetic Engineering Appraisal Committee (GEAC) In India GEAC (Genetic Engineering Appraisal Committee) decides on the safety of G... 1
- Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called Answer: 3. Biopiracy Using biological resources or related knowledge without proper authorisation and payment is called biopiracy. Biodegrad... 1
- A ‘new’ variety of rice was patented by a foreign company, though such varieties have been present in India for a long time. This is related to Answer: 4. Basmati A foreign company patented Basmati rice (a US patent to RiceTec), though India has grown basmati for centuries. Co-667 is... 1
- The correct order of steps in Polymerase Chain Reaction (PCR) is Answer: 4. Denaturation, Annealing, Extension PCR is a cycle of three steps in a fixed order: denaturation, annealing, extension. Heat (abou... 1
- Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes ? Answer: 1. Retrovirus To put a gene into animal cells such as human lymphocytes, disarmed retroviruses are used as vectors. Retroviruses inf... 1
- MALT constitutes about ______ percent of the lymphoid tissue in human body. Answer: 4. 50% Mucosa-associated lymphoid tissue (MALT) lines the respiratory, digestive and urogenital tracts. It forms about 50% of the ly... 1
- In case of poriferans, the spongocoel is lined with flagellated cells called : Answer: 2. choanocytes The spongocoel of sponges is lined by flagellated choanocytes (collar cells). Their beating drives water through the... 1
- Artificial selection to obtain cows yielding higher milk output represents : Answer: 1. directional as it pushes the mean of the character in one direction. Selecting cows for higher milk yield moves the mean of the t... 1
- Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of : Answer: 4. Residual Volume After a forceful expiration some air still stays in the lungs. This is the residual volume, about 1100 mL to 1200... 1
- Hypersecretion of Growth Hormone in adults does not cause further increase in height, because : Answer: 1. Epiphyseal plates close after adolescence. Height increases through growth at the epiphyseal plates of long bones. After adolesce... 1
- Good vision depends on adequate intake of carotene-rich food.Select the best option from the following statements.(a) Vitamin A derivatives are formed from carotene.(b) The photopigments are embedded in the membrane discs of the inner segment.(c) Ret… Answer: 1. (a), (c) and (d) Go statement by statement. (a) True: vitamin A derivatives form from carotene. (b) False: photopigments lie in t... 1
- Frog's heart when taken out of the body continues to beat for sometime.Select the best option from the following statements.(a) Frog is a poikilotherm.(b) Frog does not have any coronary circulation.(c) Heart is "myogenic" in nature.(d) Heart is auto… Answer: 3. (c) and (d) An isolated frog heart keeps beating because it is myogenic (the beat starts in the heart muscle itself) and autoexci... 1
- Transplantation of tissues/organs fails often due to non-acceptance by the patient's body. Which type of immune-response is responsible for such rejections ? Answer: 1. Cell - mediated immune response Graft rejection is due to cell-mediated immune response, carried out by T-lymphocytes that recogn... 1