11. Which of the following is done by an Antigen?
[A] Lowers body temperature
[B] destroys harmful bacteria
[C] triggers the immune system
[D] is used as an antidote to poison
Show Answer
Correct Answer: C [triggers the immune system]
Notes:
An antigen is any substance that causes your immune system to produce antibodies against it. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen. An antigen may also form inside the body.
12. Which of the following comprise plant decomposers?
[A] Monera and fungi
[B] Plantae and fungi
[C] Monera and Animalia
[D] Animalia and Protista
Show Answer
Correct Answer: A [Monera and fungi]
Notes:
Decomposers are a type of bacteria and fungi that break down dead and decaying organic matter into simpler things like carbon dioxide, water, simple sugars and mineral salts, and return nutrients to the soil.
13. Which of the following cell organelles does not contain DNA?
[A] Nucleus
[B] Mitochondria
[C] Lysosomes
[D] Chloroplast
Show Answer
Correct Answer: C [Lysosomes]
Notes:
Lysosomes and vacuoles do not contain DNA. Mitochondria and chloroplasts have their own DNA.
14. Which of the following are blue-green algae?
[A] Prokaryotes
[B] Eukaryotes
[C] Both 1 and 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: A [Prokaryotes]
Notes:
Blue-green algae or cyanobacteria are prokaryotes. They lack membrane bound organelles and a nucleus.
15. Which sugar is present in RNA?
[A] Hexose
[B] Ribose
[C] Fructose
[D] Glucose
Glucose
Show Answer
Correct Answer: B [Ribose]
Notes:
Ribose is a simple sugar present in RNA. The chemical formula of ribose is C5H10O5, Hexose (C6H1206), Glucose (C6H12O6).
16. Which of the following can affect proteins and nucleic acids, but not viruses?
[A] Denaturation
[B] Enzyme treatment
[C] Pressure
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Because it affects proteins upon denaturation, this nuclease enzymes affect nucleic acids and the pressure will affect the structure but not the virus.
17. Which of the following is a plant without seed vascular tissue?
[A] Angiosperm
[B] Pteridophytes
[C] Bryophytes
[D] Gymnosperms
Show Answer
Correct Answer: B [Pteridophytes]
Notes:
Pteridophytes are the most primitive vascular plants. It is a simple reproductive system that does not have flowers and seeds.
18. What are the vegetative parts of a flower?
[A] Sepals
[B] petals
[C] Both 1 & 2
[D] None of these
Show Answer
Correct Answer: C [Both 1 & 2]
Notes:
Sepals and petals are the vegetative parts of a flower.
19. In which of the growing tissues are cytokinins most abundant?
[A] roots
[B] embryos
[C] fruits
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Cytokinins are most abundant in growing tissues – such as roots, embryos and fruits, where cell division is taking place.
20. Which of the following play a major role in defense responses to herbivores?
[A] Oligosaccharins
[B] Jasmonate
[C] Strigolactones
[D] None of these
Show Answer
Correct Answer: B [Jasmonate]
Notes:
Jasmonates play a major role in defense responses towards herbivores. They contribute to the production of volatile compounds that attract natural enemies of predators.
