#neet
- In Hardy-Weinberg equation, the frequency of heterozygous individual is represented by Answer: 1. 2 pq The Hardy-Weinberg equation is p² + 2pq + q² = 1 . p² and q² are the homozygous genotypes, and 2pq is the frequency of heter... 1
- The chronological order of human evolution from early to the recent is Answer: 1. Ramapithecus → Australopithecus → Homo habilis → Homo erectus Use the approximate ages given in NCERT. Ramapithecus: about 15 mil... 1
- Which of the following is the correct sequence of events in the origin of life?I. Formation of protobiontsII. Synthesis of organic monomersIII. Synthesis of organic polymersIV. Formation of DNA-based genetic systems Answer: 2. II, III, I, IV The chemical evolution order is: Synthesis of organic monomers (II). Synthesis of organic polymers (III). Formatio... 1
- A molecule that can act as a genetic material must fulfill the traits given below, except Answer: 2. it should be unstable structurally and chemically A genetic material must: replicate itself, express itself (as Mendelian charact... 1
- DNA-dependent RNA polymerase catalyzes transcription on one strand of the DNA which is called the Answer: 4. template strand In transcription, RNA polymerase reads one DNA strand, which acts as the template strand (it has 3' to 5' polarit... 1
- Interspecific hybridization is the mating of Answer: 1. two different related species In interspecific hybridisation, male and female animals of two different related species are mated... 1
- Which of the following is correct regarding AIDS causative agent HIV? Answer: 1. HIV is enveloped virus that contains two identical molecules of single-stranded RNA and two molecules of reverse transcriptase. H... 1
- Among the following edible fishes, which one is a marine fish having rich source of omega-3 fatty acids? Answer: 3. Mackerel Mackerel is a marine fish and a good source of omega-3 fatty acids. Mangur (catfish), Mrigala (a major carp) and Mystus... 1
- Match Column—I with Column—II and select the correct option using the codes given below :Column—I: a. Citric acid; b. Cyclosporin A; c. Statins; d. Butyric acidColumn—II: (i) Trichoderma; (ii) Clostridium; (iii) Aspergillus; (iv) MonascusCodes :a b c… Answer: 1. (iii) (i) (iv) (ii) Citric acid: Aspergillus niger (iii). Cyclosporin A (immunosuppressant): Trichoderma polysporum (i). Statins... 1
- Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from Answer: 2. petroleum industry BOD measures the oxygen needed by microbes to break down organic matter, so it is a good index for organic was... 1
- The principle of competitive exclusion was stated by Answer: 1. G. F. Gause The competitive exclusion principle was stated by G. F. Gause. It says two closely related species competing for the... 1
- Which of the following National Parks is home to the famous musk deer or hangul? Answer: 3. Dachigam National Park, Jammu & Kashmir The Kashmir stag, called hangul, lives in Dachigam National Park in Jammu and Kashmir. Ke... 1
- A lake which is rich in organic waste may result in Answer: 3. mortality of fish due to lack of oxygen A lake with a lot of organic waste has a high microbial decomposition. The microbes use u... 1
- Which of the following sets of diseases is caused by bacteria? Answer: 4. Cholera and tetanus Cholera and tetanus are caused by bacteria (Vibrio cholerae and Clostridium tetani). Smallpox, mumps, herpes... 1
- Match Column—I with Column—II for housefly classification and select the correct option using the codes given below :Column—I: a. Family; b. Order; c. Class; d. PhylumColumn—II: (i) Diptera; (ii) Arthropoda; (iii) Muscidae; (iv) InsectaCodes :a b c d Answer: 4. (iii) (i) (iv) (ii) The housefly is classified as: Phylum Arthropoda (ii), Class Insecta (iv), Order Diptera (i), Family Muscidae... 1
- Choose the correct statement. Answer: 1. All cyclostomes do not possess jaws and paired fins. Cyclostomes (lampreys, hagfishes) have no jaws and no paired fins. Correct.... 1
- Study the four statements (A-D) given below and select the two correct ones out of them :A. Definition of biological species was given by Ernst Mayr.B. Photoperiod does not affect reproduction in plants.C. Binomial nomenclature system was given by R.… Answer: 2. A and D A: Ernst Mayr gave the biological species concept. True. B: Photoperiod affects flowering and reproduction in plants. Fal... 1
- In male cockroaches, sperms are stored in which part of the reproductive system? Answer: 4. Seminal vesicles In a male cockroach, the testes make sperm, which pass through the vasa deferentia to the seminal vesicles, wher... 1
- Red List contains data or information on Answer: 2. threatened species The IUCN Red List documents the conservation status of threatened species of plants and animals, with categori... 1
- Methanogens belong to Answer: 1. Archaebacteria Methanogens produce methane under anaerobic conditions (for example in the gut of ruminants and in biogas plants)... 1
- The label of a herbarium sheet does not carry information on Answer: 3. height of the plant A herbarium label records the collector's name, date, locality, local name, family and scientific name, habit... 1
- The term 'polyadelphous' is related to Answer: 1. androecium Polyadelphous means stamens united by their filaments into more than two bundles (for example in Citrus). Stamens belo... 1
- Radial symmetry is found in the flowers of Answer: 4. *Brassica* Radial symmetry (actinomorphic) is seen in Brassica (cruciferae). Trifolium and Pisum have zygomorphic papilionaceous... 1
- Free-central placentation is found in Answer: 4. *Dianthus* Free-central placentation, in which ovules sit on a central axis without septa, is found in Dianthus and Primula. Arge... 1