NEET is the most famous and important medical entrance examination held in our country. This exam is an objective type, an offline test which includes 4 sections namely– Physics, Chemistry, Botany, and Zoology. The maximum marks that can be scored are 720 marks and have 180 questions.
About half of the paper consists of questions from Biology, as the NEET exam essentially focuses on capacitating students to go for seats in medical courses. One of the most significant and crucial sections in the NEET exam is of Biology. It comprises of theories, descriptions, discoveries, diagrams, definitions, explanations of differences, and relations. The majority of the topics covered in the NEET syllabus are from the NCERT syllabus of Class 11 & 12 and other related sources become part of the rest of the syllabus.
Clear Exam curates a list of articles selected by professionals who recommend the highly vital topics for NEET exams. The table below takes you directly to the respective topic where the in-depth article and the MCQs are available for an easy and productive learning experience. Prior to solving NEET question papers or practicing mock tests, you must ensure to study the basic concepts in NEET and practice a few sample questions related to this exam. Students will be covered for all their studies as the topics are available from basics to even the most advanced.
Deforestation can have many impacts including increase rates of soil erosion decrease levels of rainfall and destroys natural habitats of wildlife
I. CNG burns most efficiently without leaving any unburnt remnant behind
II. CNG is cheaper than petrol or diesel
III. CNG cannot be siphoned off by thieves and adulterated like petrol or diesel
Which of the statements given above are correct?
Compressed natural gas is a better fuel than petrol or diesel because it is (i) Cheaper (ii) Burns more efficiently (iii) Does not produce much pollution (iv) Cannot of siphoned off by thieves (v) Cannot be adulterated like petrol and diesel
Sulphur dioxide causes respiratory tract diseases like asthma, bronchitis, cancer, emphysema, etc.
Q4. If a pond food chain gets polluted by DDT, the tissue concentration of DDT would be highest in
Toxic substances cannot be metabolised or excreted therefore, they get accumulated in an organism and passed onto higher trophic levels. So, if a pond food chain gets polluted by DDT, the tissue concentration of DDT would be highest in bird feeding on fish
I. conversion of former moist and fertile land into arid desert area
II. is a product of soil erosion
III. desertified area cannot be put to any use
Which of the statements given above are correct?
Desertification is a type of land degradation in which, a relatively dry land region becomes increasingly arid, typically losing its bodies of water as well as vegetation and wildlife. Desertified area cannot be put to any use. The main cause of desertification is overgrazing, others being soil erosion and deforestation
Reforestation is the natural or intentional restocking of existing forests and woodlands that have been depleted, usually through deforestation
Acid rain results from air pollution by oxides of nitrogen (NOx) and sulpaur (SOx). These gases react with water and form acids.
SO2+H2O->H2SO3
SO3+H2O->H2SO4
N2O5+H2O->2HNO3
When the pH of rain is below 5.6, it is called acid rain.
Quantitative pollutants are those substances which are already present in the environment, but are termed as pollutants when their concentration (quantity) increase in the environment, e.g.,CO2 is present on the environment in greater quality than normal.
Ozone depletion is occurring widely in the strotasphere, the depletion is particularly marked over the Antarctic region. This has resulted in formation of a large area of thinned ozone layer, commonly called as ozone hole
Cadmium (Cd) poisoning leads to itai-itai (ouch-ouch) disease. Cadmium consumption causes diarrhea, bone deformation, kindly damage, retarded growth, CNS injury etc.
Mercury (Hg) poisoning causes Minamata disease, lead (Pb) consumption cause damage to liver, heat, kidney and reduction haemoglobin formation, while black-foot disease is caused by chronic exposure to arsenic.
