11. At which stage in its life-cycle does the silkworm yield the fibre of commerce?
[A] Egg
[B] Larva
[C] Pupa
[D] Imago
Show Answer
Correct Answer: C [Pupa]
Notes:
Silk worm yield the fibre from pupa stage, which is commercially used to produce clothes.
12. Which is the largest organ in the human body?
[A] Liver
[B] Large intestine
[C] Skin
[D] Pancreas
Show Answer
Correct Answer: C [Skin]
Notes:
Skin is considered as the largest organ in the human body as a whole while liver is the largest internal organ of the human body.
13. Which branch of biology is known for the scientific study of the distribution of animals on Earth?
[A] Phytogeography
[B] Zoogeography
[C] Psychobiology
[D] Zoophytology
Show Answer
Correct Answer: B [Zoogeography]
Notes:
Zoogeography is the branch of biogeography that deals with the geographical distribution of animal species.
14. Which of the following give maximum energy after breaking down?
[A] Fat
[B] Sugar
[C] Carbohydrate
[D] Protein
Show Answer
Correct Answer: A [Fat]
Notes:
Fat gives maximum energy after breaking down, fat is composed of essential carbon and hydrogen atoms releasing 9.1 calories per gram of energy.
15. The biological nature of the virus came from studies by the Russian scientist ____ in 1892 and by the Dutch scientist ____ in 1898.
[A] Dmitry I. Ivanovsky, Martinus W. Beijerinck
[B] Martinus W. Beijerinck, Dmitry I. Ivanovsky
[C] Félix H. d’Hérelle, Frederick W. Twort
[D] Frederick W. Twort, Félix H. d’Hérelle
Show Answer
Correct Answer: A [Dmitry I. Ivanovsky, Martinus W. Beijerinck]
Notes:
The biological nature of viruses was discovered in 1892 by the Russian scientist Dmitry I. Ivanovsky and in 1898 the Dutch scientist Martinus W. Beijerinck’s studies.
16. Where is teichoic acid commonly found?
[A] cell walls of gram positive bacteria
[B] outer membranes of gram positive bacteria
[C] cell walls of gram negative bacteria
[D] outer membranes of gram negative bacteria
Show Answer
Correct Answer: A [cell walls of gram positive bacteria]
Notes:
Teichoic acid is found within the cell wall of most Gram-positive bacteria. It appears to extend to the surface of the peptidoglycan layer, and species in the genera Staphylococcus, Streptococcus, Bacillus, Clostridium, Corynebacterium and Listeria.
17. What are the characteristics of sexual reproduction?
[A] Two parents are involved
[B] Gamete formation and fertilization take place
[C] The whole process is slow and lengthy
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
The characteristics of sexual reproduction are: Two parents are involved, Gamete formation and fertilization take place, the process is slow and lengthy and offspring are different from parents, genetically and physically.
18. Where are Amphiumas found?
[A] southeastern Virginia
[B] Louisiana
[C] Alabama
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Amphiumas are found in southeastern Virginia, eastern North Carolina, South Carolina, southern Georgia and Alabama, Florida, south Mississippi, Louisiana, and southeastern Texas. Amphiumidae is also called congo eels.
19. What type of reptiles are turtles?
[A] Viviparous
[B] Oviparous
[C] Bisexual
[D] Parthenogenic
Show Answer
Correct Answer: B [Oviparous]
Notes:
Oviparous animals are female animals that lay their eggs, with little or no other embryonic development within the mother. Turtles are Oviparous.
20. The material covering the bones of reptiles is?
[A] Calcium
[B] Chitin
[C] Keratin
[D] None
Show Answer
Correct Answer: C [Keratin]
Notes:
The material covering the bones of reptiles is Keratin and their skin is dry, and rough, without any glands.
