11. Robert Hooke is known for which of the following works?
[A] how messages pass between nerve cells in mammals
[B] first use of the word cell
[C] theory of punctuated equilibrium
[D] aquatic ape theory
Show Answer
Correct Answer: B [first use of the word cell]
Notes:
Robert Hooke is known for his discovery of the law of elasticity (Hooke’s law), for his first use of the word cell in the sense of a basic unit of organisms, and for his studies of microscopic fossils, which made him an early proponent of a theory of evolution.
12. The name of Theodor Schwann is associated with the discovery of which of the following?
[A] enzyme pepsin
[B] glial cells in nerves
[C] microorganisms play in alcohol fermentation
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Schwann discovered the enzyme pepsin and discovered glial cells in nerves – these are now known as Schwann cells. He also identified the role of microorganisms in alcohol fermentation.
13. Which of the following is a type of Monera Kingdom?
[A] Bacteria
[B] Mushroom
[C] Euglena
[D] Mucor
Show Answer
Correct Answer: A [Bacteria]
Notes:
Bacteria comes under Monera kingdom, Mushroom and Mucor are part of Fungi.
14. What are cryptogamous plants?
[A] Flowerless plant
[B] Seedless Plant
[C] Reproduce by spores
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Cryptogamic plants include Algae, mosses, liverworts, lichens, ferns and fungi and they reproduce by spores and not producing flowers or seed.
15. What is the condition called when a virus enters a cell but does not replicate itself immediately?
[A] lysogeny
[B] fermentation
[C] symbiosis
[D] synergism
Show Answer
Correct Answer: A [lysogeny]
Notes:
Lysogeny is a type of life cycle that occurs when a bacteriophage infects certain types of bacteria.
16. What is the shape of enveloped viruses?
[A] icosahedral
[B] helical
[C] roughly spherical
[D] complex
Show Answer
Correct Answer: C [roughly spherical]
Notes:
The shape of enveloped viruses is roughly spherical. Enveloped virus have glyco-protein spikes that arise from their envelopes.
17. A protein that binds to operators or stoperators within prophage to prevent transcription of lytic genes is called__?
[A] immunity repressor
[B] immunity operon
[C] operon repressor
[D] None of these
Show Answer
Correct Answer: A [immunity repressor]
Notes:
A protein that binds to operators or stoperators within prophage to prevent transcription of lytic genes is called immunity repressor.
18. Coconut milk contains a cytokinin called ____ which promotes plant growth.
[A] Naphthalene acetic acid
[B] Indole-3-acetic acid
[C] Gelatin
[D] Zeatin
Show Answer
Correct Answer: D [Zeatin]
Notes:
Zeatin is a plant growth hormone in the cytokinin family. It is a purine ring structure with a side chain that contains hydroxyl, amino, and olefin groups.
19. Flag smut of wheat is caused by__.
[A] Ustilago tritici
[B] Urocystis agropyri
[C] Ustilago hordet
[D] Taphrina deformans
Show Answer
Correct Answer: B [Urocystis agropyri]
Notes:
Flag smut is caused by a fungal pathogen Urocystis agropyri. Flag smut is characterized by long, black raised stripes on leaves, leaf sheaths, gooseberries, and sometimes on stems.
20. Flight muscles of birds are attached to:
[A] Clavicle
[B] Coracoid
[C] Keel of sternum
[D] Scapula
Show Answer
Correct Answer: C [Keel of sternum]
Notes:
Flight muscles of birds are attached to the Keel of the sternum. The keel bone provides the main attachment for the flight muscles.
