NEET UG
- The highest DDT concentration in aquatic food chain shall occur in Answer: 1. seagull DDT is not broken down and builds up at each higher trophic level (biomagnification). The seagull is the top consumer her... 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
- 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
- If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is Answer: 4. 0 Colour blindness is X-linked recessive. Let the normal allele be X and the defective allele X^c. Father: X^cY. Mother (homozygo... 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
- 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
- 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
- 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
- Genetic drift operates in Answer: 4. small isolated population Genetic drift is a random change in allele frequency due to chance. Its effect is strong in small isola... 1
- 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
- Which of the following depicts the correct pathway of transport of sperms? Answer: 4. Rete testis → Efferent ductules → Epididymis → Vas deferens The sperm path is: seminiferous tubules, then rete testis, then effer... 1
- Match Column—I with Column—II and select the correct option using the codes given below :Column—I: a. Mons pubis; b. Antrum; c. Trophectoderm; d. NebenkernColumn—II: (i) Embryo formation; (ii) Sperm; (iii) Female external genitalia; (iv) Graafian fol… Answer: 1. (iii) (iv) (i) (ii) Mons pubis: fatty cushion over the pubic bone, part of the female external genitalia (iii). Antrum: fluid-fil... 1
- Several hormones like hCG, hPL, estrogen, progesterone are produced by Answer: 1. placenta The placenta is a temporary endocrine tissue during pregnancy. It makes hCG, hPL (human placental lactogen), estrogens a... 1
- Match the stages of meiosis in Column—I to their characteristic features in Column—II and select the correct option using the codes given below :Column—I: a. Pachytene; b. Metaphase I; c. Diakinesis; d. ZygoteneColumn—II: (i) Pairing of homologous ch… Answer: 4. (iii) (iv) (ii) (i) Each stage of meiotic prophase I has one signature event. Pachytene: crossing-over between non-sister chromat... 1
- Select the wrong statement. Answer: 4. The walls of diatoms are easily destructible. Diatom cell walls are made of silica and are indestructible, so statement 4 is wron... 1
- Which one of the following is wrong for fungi? Answer: 1. All fungi possess a purely cellulosic cell wall. Fungal cell walls are made of chitin and other polysaccharides, not purely cellu... 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
- Conifers are adapted to tolerate extreme environmental conditions because of Answer: 2. thick cuticle Conifers grow in cold, dry conditions. A thick cuticle and sunken stomata, with needle-like leaves, reduce water lo... 1
- Which one of the following statements is wrong ? Answer: 1. Algin is obtained from red algae, and carrageenan from brown algae. The statement is reversed. Algin comes from brown algae and c... 1