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Biology Past Questions

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11

the function of lenticels is

  • A. to remove excess water in plant
  • B. to absorb water from the atmosphere
  • C. for gaseous exchange
  • D. to absorb light
  • E. to store food
View Answer & Discuss (37) JAMB 1978
12

The following events take place during conjugation in spirogyra 1. The protoplasm of each of the conjugating cell separate from the cell wall to form a Gamete; the gamete of one filament passes through the conjugation tube to meet the gamete of the other filament 2. The zygote soon become surrounded by thick brown wall to become zygospore which burst after a short rest and germinate to produce a new filament 3. The nuclei of the gametes fuse to form a zygote 4. The protuberance meet and where they touch the cell-wall disappear so that a conjugation tube joining the two cell is formed 5. protuberance appear on the wall of the cell of two filament of spirogyra lying side by side opposite one another. Now what is the correct sequence in which the above sequence occur?

  • A. 1,2,3,4,5
  • B. 1,2,4,5,3
  • C. 3,4,5,2,1
  • D. 5,4,1,3,2
  • E. 5,4,3,1,2
View Answer & Discuss (9) JAMB 1978
13

Which of the following is a characteristic of animal cell?

  • A. Presence of chloroplast
  • B. possession of cellulose cell-wall
  • C. absence of large vacuoles
  • D. presence of large vacuoles
  • E. presence of chromosome
View Answer & Discuss (30) JAMB 1978
14

Nitrifying bacteria keep the soil fertile by

  • A. converting nitrate to nitrogen
  • B. converting ammonium salt to nitrate
  • C. converting atmospheric nitrogen to plant nitrogen
  • D. converting nitrate to nitrous oxide
  • E. converting atmospheric nitrogen to nitrates
View Answer & Discuss (16) JAMB 1978
15

In the life history of schistosoma (Bilharzia), one of the following is intermediate host

  • A. man
  • B. snail
  • C. mosquito larva
  • D. crayfish
  • E. fish
View Answer & Discuss (17) JAMB 1978