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Que. Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.
[NEET (National) 2019]
(a) Streptococcus pneumoniae / Widal test
(b) Salmonella typhi / Anthrone test
(c) Salmonella typhi / Widal test
(d) Plasmodium vivax / UTI test
Ans. (c)
Typhoid fever is caused by the bacterium Salmonella typhi and widal test is the confirmatory test for typhoid, which is based on antigen antibody reaction. Typhoid fever or enteric fever has the incubation period of 1 to 2 weeks and it is usually transmitted through contaminated food and water.
Que. Mad cow disease in cattle is caused by an organism which has
[NEET (Odisha) 2019]
(a) inert crystalline structure
(b) abnormally folded protein
(c) free RNA without protein coat
(d) free DNA without protein coat
Ans. (b)
Mad cow disease in cattle is caused by prions which are abnormally folded proteins. It is also known as Bovine Spongiform Encephalopathy (BSE). It is a progressive neurological disorder of cattle.
Que. Which of the following is correctly matched for the product produced by them?
[NEET 2017]
(a) Acetobacter aceti: Antibiotics
(b) Methanobacterium : Lactic acid
(c) Penicillium notatum : Acetic acid
(d) Saccharomyces cerevisiae : Ethanol
Ans. (d)
Acetobacter aceti produces acetic acid. Methanobacterium produces methane. Penicillium notatum produces penicillin. Saccharomyces cerevsiae produces ethanol.
Que. First discovered restriction endonuclease that always cuts DNA molecule at a particular point by recognising a specific sequence of six base pairs is
[NEET (Oct.) 2020]
(a) Eco RI
(b) Adenosine deaminase
(c) Thermostable DNA polymerase
(d) Hind II
Ans. (d)
Hind II was the first discovered endonuclease. It was isolated by Smith Wilcox and Kelley (1968) from Haemophilus influenzae bacterium. It always cuts bacterium. DNA at particular point by recognising a specific sequence of six base pairs. It is known as the recognition sequence for Hind II and reads as 5β-GTC GAC-3β, 3β-CAG CTG-5β.
Que. 4 If an agricultural field is liberally irigated for a prolonged period of time, it is likely to face problem of
[NEET (Odisha) 2019
(a) metal toxicity
(b) alkalinity
(c) acidity
(d) salinity
Ans. (d)
Salinity of soil is a problem faced by farmers if they liberally irrigate agricultural field for a prolonged periodof time.
Irrigation salinity is the accumulation of salts in the topsoil under irrigation. It is caused by over irrigation of agricultural and, inefficient water use, poor drainage and the irrigation of unsuitable and leaky soils.
Que. Study of inter-relationships between living organisms and their environment is
[CBSE AIPMT 1993]
(a) Ecology
(b) Ecosystem
(c) Phytogeography
(d) Ethology
Ans. (a)
Study of inter relationship between living organisms a is called as Ecology. Ecology may be called environmental biology.
Que. Which one of the following is a characteristic feature of cropland ecosystem?
[NEET 2016, Phase II]
(a) Least genetic diversity
(b) The absence of weeds
(c) Ecological succession
(d) The absence of soil organisms
Ans. (a)
Cropland ecosystem is largest anthropogenic ecosystem characterised by less diversity and high productivity.
Que. Alexander von Humbolt described for the first time
[NEET 2017]
(a) ecological biodiversity
(b) law of limiting factor
(c) species area relationships
(d) population growth equation
Ans. (c)
Alexander von Humbolt was a great German naturalist and geographer. He did extensive explorations in the wilderness of South American forests. He established species area relationship.
He observed that with in a region, species richness increase with increasing explored area, but upto a certain limit. Infact, the relationship between species richness and area for a variety of taxa turns out to be a rectangular hyperbola.
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Nitrate present in the soil is also reduced to nitrogen by the process of denitrification . denitrification carried by the bacteria of οΏΌ
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A metal ring is held horizontally and bar magnet is dropped through the ring with its length along the axis of the ring.The
acceleration of the falling magnet is
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Orr haan ?? Jo handwritten notes ki itne high quality mei pdf deta hu , pyq ques ke pdf .
Voto 2 minutes mei ban jaati hai !!
Hena ???πππ
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Pehli baat to ye ,
Ki me ek student hu koi teacher nahi , or baat rahi notes ki to alag alag platform ya channel se lakar tumko ek jagah ache se arranged form mei dena hi kaffi badi baat hai ,
