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. 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) there was no food in the tank, so the fish starved b) the body cells of the fish swelled and burst as a result of the hypotonic fresh water c) the body cells of the fish shrank as their sap was hypertonic to the freshwater d) the tank was too small compared to the large-ocean 2 / 30 2. 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 3 / 30 3. 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) 46.7 d) 20.0 4 / 30 4. Choose the sequence which represents the correct order of organisms in a food chain a) Grass, grasshopper, toad, snake, hawk b) Grass, snake, toad, grasshopper, hawk c) Grass, grasshopper, snake, toad, hawk. d) Grass, snake, grasshopper, toad, hawk 5 / 30 5. 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 6 / 30 6. 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) 23% c) 35% d) 16% 7 / 30 7. The appendicular skeleton is composed of the pectoral girdle? a) lumbar vertebrae and pelvic girdle b) pelvic girdle, fore and hind limbs c) lumbar vertebrae, fore and hind limbs d) pelvic girdle and fore limbs 8 / 30 8. Which of the following produces both hormones and enzymes? a) Kidney b) Gall bladder c) Pancreas d) Ileum 9 / 30 9. 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 10 / 30 10. 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 workers which are specially fed to breed d) some adult reproductives from the same colony 11 / 30 11. If a DNA strand has a base sequence TCA, its complementary strand must be? a) GAT b) ATG c) TAG d) AGT 12 / 30 12. 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) takes tip water and burst d) absorbs a little water 13 / 30 13. Which of the following food substances will produce a brick-red colour when warmed with Benedict's solution? a) Starch b) Glucose c) Egg White d) Maltose 14 / 30 14. 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 15 / 30 15. Flatworms and roundworms are said to be invertebrates because? a) they can live inside the vertebrates b) they have no backbones c) some of them are unicellular d) they are small animals 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) mesenteric artery d) hepatic artery 17 / 30 17. The order of passage of food in the digestive system is a) ileum --> caecum ->large intestine -> rectum b) large intestine --> ileum -> caecum -> rectum c) B ileum --> colon --> caecum -> rectum d) colon -> caecum -> ileum -> rectum 18 / 30 18. 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 19 / 30 19. The two key cations involved in the action potential of nervous transmissions are? a) Na+ and Fe2+ b) Mg2+ and K+ c) Na+ and K+ d) Fe2+ and Mg2+ 20 / 30 20. In the mammalian respiratory system. exchange of gases occurs in the? a) bronchi b) alveoli c) bronchioles d) lungs 21 / 30 21. Which of the following is TRUE of the process of conjugation in Paramecium? a) Macro nucleus undergoes division b) Each micronucleus divides twice c) Each ex-conjugant divides only once d) Micronucleus disintegrates 22 / 30 22. 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) I, II, III, IV c) I, IV, III, II d) IV, III, II, I 23 / 30 23. 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 24 / 30 24. One of the functions of the xylem is? a) conducting manufactured food b) reducing loss of water c) strengthening the stem d) manufacturing food 25 / 30 25. Which of the following is a measure for the control of bilharzia? a) Application of herbicides in water bodies b) Cutting low bushes around homes c) Screening windows and doors with mosquito nets d) Application of molluscicides in water bodies 26 / 30 26. The villus in the small intestine is significant because it? a) assists in mixing digested food b) assists in filtering undigested food c) increases the surface area for absorption d) increases the surface area for digestion 27 / 30 27. Some of the features of an animal are scales, teeth, nares, and backbone. The animal is likely to be a? a) bird b) lizard c) toad d) rat 28 / 30 28. Aged erythrocytes are destroyed in the? a) lymph nodes b) kidney c) pancreas d) liver 29 / 30 29. A freshwater plant such as water lily can solve the problem of buoyancy by the possession of? a) aerenchyma tissues b) thin cell walls of the epidermis c) dissected leaves d) water-repelling epidermis 30 / 30 30. People who suck petrol with their mouths run the risk of increasing in their blood the concentration of a) lead b) calcium c) iron d) magnesium Your score is The average score is 25% Restart Cbt Please click the stars to rate the quiz Send feedback
