31. The stroma of the ovary consists of blood vessels, nerves, muscle fibers, and a type of protein called?
[A] Fibrin
[B] Collagen
[C] Albumin
[D] Globulin
Show Answer
Correct Answer: B [Collagen]
Notes:
The stroma of the ovary contains blood vessels, nerves, muscle fibers, and a type of protein called collagen. Collagen is the main structural protein of various connective tissues in animals. These are secreted by fibroblast cells.
32. Which of the following organism causes pneumonia?
[A] Bacteria
[B] Protozoan
[C] Fungi
[D] Slime mould
Show Answer
Correct Answer: A [Bacteria]
Notes:
A common cause of bacterial pneumonia is Streptococcus pneumoniae. This is an infection of your lungs caused by certain bacteria.
33. The alternate form of a gene is__
[A] Alternate type
[B] Recessive character
[C] Dominant character
[D] Allele
Show Answer
Correct Answer: D [Allele]
Notes:
The alternate form of a gene is Allele. An allele is a variant of a gene.
34. A process in which earthworms convert organic waste into manure rich in high nutritional content is called
[A] Farmyard manure
[B] Bio Compost
[C] Vermicomposting
[D] Green manure
Show Answer
Correct Answer: C [Vermicomposting]
Notes:
A process in which earthworms convert organic waste into manure rich in high nutritional content is called Vermicomposting.
35. Which of the following is an example of a loose association of nitrogen-fixing bacteria?
[A] Rhizobium
[B] Blue-Green algae
[C] Azotobacter
[D] Azospirillum
Show Answer
Correct Answer: D [Azospirillum]
Notes:
Azospirillum is an example of a loose association of nitrogen-fixing bacteria. Azotobacter is an example of Free-Living Nitrogen-Fixing Bacteria. Rhizobium is an example of Symbiotic Nitrogen-Fixing Bacteria. Blue-Green alga is an example of Symbiotic Nitrogen-Fixing Cyanobacteria.
36. Who proposed rDNA technology?
[A] Herbert W. Boyer
[B] Stanley N
[C] Both 1 and 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: C [Both 1 and 2]
Notes:
Herbert W. Boyer and Stanley N proposed rDNA technology. Recombinant DNA (rDNA) is a technology that uses enzymes to cut and paste together DNA sequences of interest.
37. Bt toxin is produced by a bacterium called __.
[A] Bacillus thuringiensis
[B] Bacillus anthracis
[C] Bacillus thermophilus
[D] Bacillus subtilis
Show Answer
Correct Answer: A [Bacillus thuringiensis]
Notes:
Bt toxin is produced by a bacterium called Bacillus thuringiensis.
38. Which one of the following features is absent in a virus?
[A] Presence of cell wall
[B] Reproduce within host cell
[C] Fully parasitic in nature
[D] Presence of either DNA or RNA
Show Answer
Correct Answer: A [Presence of cell wall]
Notes:
A virus has a simple structure. It has no internal cellular structure, no cell wall or cell membrane, just the protein coat that holds the string of nucleic acid. It is made only of a nucleic acid + a protein coat. A cell wall is a layer located outside the cell membrane found in plants, fungi, bacteria, algae, and archaea.
39. Which of the following are warm-blooded animals?
[A] Whales
[B] Draco
[C] Alytes
[D] Whale Sharks
Show Answer
Correct Answer: A [Whales]
Notes:
Animals, such as mammals and birds, that maintain a constant body temperature regardless of the temperature of the surroundings are called warm blooded. These include birds and mammals. Whales are aquatic mammals hence, being mammal, they are warm blooded. The have a thick layer of fats called blubber underneath their skin to maintain temperature even in cold water of oceans.
40. Which of the following cell organelle contains DNA apart from nucleus?
[A] Golgi Apparatus
[B] Mitochondria
[C] Cytoplasm
[D] Ribosome
Show Answer
Correct Answer: B [Mitochondria]
Notes:
The three organelles that contain DNA are the nucleus, mitochondria and chloroplasts. Mitochondria are unlike most organelles (with an exception of plant chloroplasts) in that they have their own set of DNA and genes that encode proteins. They are specialized structures unique to the cells of animals, plants and fungi.
