21. Which of the following processes removes carbon from the atmosphere?
- A. putrefaction
- B. photosynthesis
- C. volcanic eruption
- D. burning of fuels
Correct Option: Answer is D
22. Which of the following cycles involves the process of precipitation and transpiration?
- A. water cycles
- B. carbon cycle
- C. nitrogen cycle
- D. oxygen cycle
Correct Option: Answer is D
23. What is the critical limiting factor for plants below the photic zone in an aquatic ecosystem?
- A. availability of nutrients
- B. availability of water
- C. intensity of light
- D. carbon dioxide concentration
Correct Option: Answer is A
24. Which of the following instruments is used to estimate the number of plants in a habitat?
- A. pooter
- B. pitfall trap
- C. quadrant
- D. sweep net
Correct Option: Answer is A
25. Which of the following statements is true about sandy soil?
- A. has limited air space
- B. is light and easy to dig
- C. drains slowly
- D. is heavy and poorly aerated
Correct Option: Answer is C
26. Which of the following organisms is a primary consumer?
- A. dog
- B. sheep
- C. grass
- D. fungus
Correct Option: Answer is C
27. Study the diagram of a food chain shown and use; it to answer the question.
P —> Q —> R —> S —> T
The organism designated P in the food chain above is normally sustained by energy from
- A. sunlight
- B. carbohydrates
- C. green plants
- D. mineral salts
Correct Option: Answer is C
28.
Study the diagram of a food chain shown and use; it to answer the question.
P —> Q —> R —> S —> T
Which of the following statements best describes the organism designated R? It
- A. feeds on S
- B. is a primary consumer
- C. is a producer as well as a consumer
- D. is a secondary consumer
Correct Option: Answer is A
29. Which of the following diseases is not hereditary?
- A. Albinism
- B. Scabies
- C. Haemophilla
- D. Colour blindness
Correct Option: Answer is B
Is scabies hereditary? No, but it is common for several members of a family to have scabies at the same time as it spreads easily when people live together.
Scabies is an itchy, highly contagious skin disease caused by an infestation by the itch mite Sarcoptes scabiei. Direct skin-to-skin contact is the mode of transmission. A severe and relentless itch is the predominant symptom of scabies.
30. The immediate product of meiosis in flowering plants is the
- A. sporophyte
- B. gametophyte
- C. zygote
- D. pollen grains
can you please verify the answer for biology 2018 jamb question 29. I think the correct answer should be Scabies, that is option B and not A since albinism is an autosomal recessive disorder, hence it is hereditary.
Thank you Solomon, you are 100% correct and it has been corrected and updated.