2021 – JAMB BIOLOGY PAST QUESTIONS & ANSWERS CBT PRACTICE You can also check in for latest; 9JA Music Gospel Music Foreign Music 7 123456789101112131415161718192021222324252627282930 2021 - JAMB Biology Past Questions & Answers Cbt Practice 1 / 30 1. Which of the following food substances will produce a brick-red colour when warmed with Benedict's solution? a) Egg White b) Glucose c) Starch d) Maltose 2 / 30 2. Flatworms and roundworms are said to be invertebrates because? a) they have no backbones b) they are small animals c) some of them are unicellular d) they can live inside the vertebrates 3 / 30 3. I. High birth rate and high immigration rate II. Low birth rate and high immigration rate III. Low mortality rate and low emigration rate IV. High mortality rate and high emigration rate. Which combination of the above can cause rapid over-crowding in climax biotic communities and human settlements? a) I and II b) I and IV c) II and III d) I and II 4 / 30 4. Which of the following is a measure for the control of bilharzia? a) Application of herbicides in water bodies b) Application of molluscicides in water bodies c) Cutting low bushes around homes d) Screening windows and doors with mosquito nets 5 / 30 5. The order of passage of food in the digestive system is a) B ileum --> colon --> caecum -> rectum b) ileum --> caecum ->large intestine -> rectum c) colon -> caecum -> ileum -> rectum d) large intestine --> ileum -> caecum -> rectum 6 / 30 6. When a marine fish was taken from the ocean and put in a tank of fresh water, it died after a short period because? a) the tank was too small compared to the large-ocean b) the body cells of the fish shrank as their sap was hypertonic to the freshwater c) there was no food in the tank, so the fish starved d) the body cells of the fish swelled and burst as a result of the hypotonic fresh water 7 / 30 7. When a Spirogyra cell is immersed in a salt solution more concentrated than its cell sap, it? a) loses water and shrivels b) takes tip water and burst c) absorbs a little water d) remains unchanged 8 / 30 8. The villus in the small intestine is significant because it? a) assists in filtering undigested food b) assists in mixing digested food c) increases the surface area for digestion d) increases the surface area for absorption 9 / 30 9. The two key cations involved in the action potential of nervous transmissions are? a) Na+ and Fe2+ b) Fe2+ and Mg2+ c) Mg2+ and K+ d) Na+ and K+ 10 / 30 10. Which of the following is TRUE of the process of conjugation in Paramecium? a) Micronucleus disintegrates b) Each micronucleus divides twice c) Macro nucleus undergoes division d) Each ex-conjugant divides only once 11 / 30 11. I. Rattus rattus. Il. Agama agama III. Bufo regularis IV. Tilapia zillii The order of evolutionary advancement of the above vertebrates is? a) IV, III, II, I b) II, III, IV, I c) I, II, III, IV d) I, IV, III, II 12 / 30 12. The appendicular skeleton is composed of the pectoral girdle? a) lumbar vertebrae, fore and hind limbs b) pelvic girdle and fore limbs c) lumbar vertebrae and pelvic girdle d) pelvic girdle, fore and hind limbs 13 / 30 13. If a DNA strand has a base sequence TCA, its complementary strand must be? a) GAT b) ATG c) TAG d) AGT 14 / 30 14. Which of the following is NOT regarded as a pollutant on land or in the air? a) Sulphur dioxide b) Nitrogen c) Smoke d) Noise 15 / 30 15. The correct sequence of the movement of urea during urine formation is? a) glomerulus ---> Bowman's capsule -> convoluted tubule ---> Henle's loop -> collecting- tubule b) convoluted tubule -> Bowman's capsule -> Henle's loop -7> glomerulus -> collecting tubule c) glomerulus -> Bowman's capsule -> convoluted tubule -> Henle's loop -> convoluted tubule -> collecting tubule d) convoluted tubule -> glomerulus --> Nettle's loop -> Bowman's capsule->collecting tubule 16 / 30 16. The correct sequence for the perception of smell in mammals is? a) dissolved chemicals --> sensory cells --> olfactory nerve --> brain b) dissolved chemicals --> nasal sensory cells --> brain c) chemicals --> olfactory nerve endings --> brain d) chemicals --> mucus membrane sensory cells --> brain 17 / 30 17. In the mammalian respiratory system. exchange of gases occurs in the? a) alveoli b) bronchi c) bronchioles d) lungs 18 / 30 18. People who suck petrol with their mouths run the risk of increasing in their blood the concentration of a) magnesium b) iron c) lead d) calcium 19 / 30 19. When the original king and queen of termites die, they are replaced by a) some adult reproductives from the same colony b) some adult workers which are specially fed to breed c) developing nymphs nurtured as secondary reproductives d) the king and queen of another colony 20 / 30 20. One of the functions of the xylem is? a) strengthening the stem b) reducing loss of water c) conducting manufactured food d) manufacturing food 21 / 30 21. Which of the statements below is not characteristic of wind-pollinated flowers? a) Nectary is usually absent b) The pollen grains have rough spiny surfaces c) The flowers are not scented. d) Stigmas are usually large and feathery 22 / 30 22. The initial volume of water poured into a bag of dry soil was 50ml and the amount that drained through was 35mI. The percentage water content of the fully soaked soil is therefore? a) 25.0 b) 46.7 c) 30.0 d) 20.0 23 / 30 23. The blood vessel which carries blood from the alimentary canal to the liver is the? a) hepatic vein b) hepatic portal vein c) hepatic artery d) mesenteric artery 24 / 30 24. A freshwater plant such as water lily can solve the problem of buoyancy by the possession of? a) dissected leaves b) aerenchyma tissues c) thin cell walls of the epidermis d) water-repelling epidermis 25 / 30 25. Aged erythrocytes are destroyed in the? a) liver b) lymph nodes c) kidney d) pancreas 26 / 30 26. The number of plant species obtained from a population study of a garden is as follows: Guinea grass (15), Ipomoea spp (5), Sida spp (7) and Imperata spp (23) What is the percentage of occurrence of Imperata spp? a) 16% b) 35% c) 46% d) 23% 27 / 30 27. In demonstrating the importance of mineral elements in plants, the culture bottle must be darkened to? a) prevent algal growth in culture solution b) allow root growth c) prevent breakdown of mineral elements d) prevents photosynthesis in the root 28 / 30 28. Choose the sequence which represents the correct order of organisms in a food chain a) Grass, grasshopper, snake, toad, hawk. b) Grass, grasshopper, toad, snake, hawk c) Grass, snake, toad, grasshopper, hawk d) Grass, snake, grasshopper, toad, hawk 29 / 30 29. Some of the features of an animal are scales, teeth, nares, and backbone. The animal is likely to be a? a) rat b) lizard c) toad d) bird 30 / 30 30. Which of the following produces both hormones and enzymes? a) Pancreas b) Gall bladder c) Kidney d) Ileum Your score is The average score is 25% Restart Cbt Please click the stars to rate the quiz Send feedback
