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. A freshwater plant such as water lily can solve the problem of buoyancy by the possession of? a) water-repelling epidermis b) thin cell walls of the epidermis c) aerenchyma tissues d) dissected leaves 2 / 30 2. If a DNA strand has a base sequence TCA, its complementary strand must be? a) GAT b) TAG c) ATG d) AGT 3 / 30 3. Which of the following is TRUE of the process of conjugation in Paramecium? a) Each ex-conjugant divides only once b) Each micronucleus divides twice c) Macro nucleus undergoes division d) Micronucleus disintegrates 4 / 30 4. In the mammalian respiratory system. exchange of gases occurs in the? a) lungs b) alveoli c) bronchi d) bronchioles 5 / 30 5. 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 6 / 30 6. 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) I and II d) II and III 7 / 30 7. 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) 30.0 c) 20.0 d) 46.7 8 / 30 8. When a Spirogyra cell is immersed in a salt solution more concentrated than its cell sap, it? a) loses water and shrivels b) remains unchanged c) absorbs a little water d) takes tip water and burst 9 / 30 9. Flatworms and roundworms are said to be invertebrates because? a) they are small animals b) some of them are unicellular c) they have no backbones d) they can live inside the vertebrates 10 / 30 10. Which of the statements below is not characteristic of wind-pollinated flowers? a) Nectary is usually absent b) The flowers are not scented. c) The pollen grains have rough spiny surfaces d) Stigmas are usually large and feathery 11 / 30 11. People who suck petrol with their mouths run the risk of increasing in their blood the concentration of a) magnesium b) lead c) calcium d) iron 12 / 30 12. When the original king and queen of termites die, they are replaced by a) the king and queen of another colony b) developing nymphs nurtured as secondary reproductives c) some adult reproductives from the same colony d) some adult workers which are specially fed to breed 13 / 30 13. Which of the following produces both hormones and enzymes? a) Kidney b) Gall bladder c) Ileum d) Pancreas 14 / 30 14. Choose the sequence which represents the correct order of organisms in a food chain a) Grass, snake, toad, grasshopper, hawk b) Grass, snake, grasshopper, toad, hawk c) Grass, grasshopper, snake, toad, hawk. d) Grass, grasshopper, toad, snake, hawk 15 / 30 15. The order of passage of food in the digestive system is a) B ileum --> colon --> caecum -> rectum b) colon -> caecum -> ileum -> rectum c) ileum --> caecum ->large intestine -> rectum d) large intestine --> ileum -> caecum -> rectum 16 / 30 16. 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 17 / 30 17. The appendicular skeleton is composed of the pectoral girdle? a) lumbar vertebrae and pelvic girdle b) pelvic girdle, fore and hind limbs c) pelvic girdle and fore limbs d) lumbar vertebrae, fore and hind limbs 18 / 30 18. Which of the following is NOT regarded as a pollutant on land or in the air? a) Noise b) Sulphur dioxide c) Nitrogen d) Smoke 19 / 30 19. Some of the features of an animal are scales, teeth, nares, and backbone. The animal is likely to be a? a) bird b) toad c) lizard d) rat 20 / 30 20. I. Rattus rattus. Il. Agama agama III. Bufo regularis IV. Tilapia zillii The order of evolutionary advancement of the above vertebrates is? a) II, III, IV, I b) IV, III, II, I c) I, II, III, IV d) I, IV, III, II 21 / 30 21. Which of the following food substances will produce a brick-red colour when warmed with Benedict's solution? a) Starch b) Maltose c) Egg White d) Glucose 22 / 30 22. In demonstrating the importance of mineral elements in plants, the culture bottle must be darkened to? a) prevents photosynthesis in the root b) prevent algal growth in culture solution c) prevent breakdown of mineral elements d) allow root growth 23 / 30 23. One of the functions of the xylem is? a) strengthening the stem b) manufacturing food c) conducting manufactured food d) reducing loss of water 24 / 30 24. The correct sequence for the perception of smell in mammals is? a) dissolved chemicals --> nasal sensory cells --> brain b) chemicals --> olfactory nerve endings --> brain c) dissolved chemicals --> sensory cells --> olfactory nerve --> brain d) chemicals --> mucus membrane sensory cells --> brain 25 / 30 25. Which of the following is a measure for the control of bilharzia? a) Screening windows and doors with mosquito nets b) Application of herbicides in water bodies c) Application of molluscicides in water bodies d) Cutting low bushes around homes 26 / 30 26. The correct sequence of the movement of urea during urine formation is? a) convoluted tubule -> Bowman's capsule -> Henle's loop -7> glomerulus -> collecting tubule b) glomerulus -> Bowman's capsule -> convoluted tubule -> Henle's loop -> convoluted tubule -> collecting tubule c) convoluted tubule -> glomerulus --> Nettle's loop -> Bowman's capsule->collecting tubule d) glomerulus ---> Bowman's capsule -> convoluted tubule ---> Henle's loop -> collecting- tubule 27 / 30 27. 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) 46% b) 16% c) 35% d) 23% 28 / 30 28. Aged erythrocytes are destroyed in the? a) kidney b) pancreas c) liver d) lymph nodes 29 / 30 29. 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 body cells of the fish shrank as their sap was hypertonic to the freshwater b) the body cells of the fish swelled and burst as a result of the hypotonic fresh water c) the tank was too small compared to the large-ocean d) there was no food in the tank, so the fish starved 30 / 30 30. The two key cations involved in the action potential of nervous transmissions are? a) Mg2+ and K+ b) Na+ and Fe2+ c) Fe2+ and Mg2+ d) Na+ and K+ Your score is The average score is 25% Restart Cbt Please click the stars to rate the quiz Send feedback
