31. What is the function of the vena cava in the excretory system?
[A] form a network between the arteries to veins
[B] return deoxygenated blood from the body and the head to the heart
[C] Both 1 and 2
[D] None of these
Show Answer
Correct Answer: B [return deoxygenated blood from the body and the head to the heart]
Notes:
The vena cava returns deoxygenated blood from the body and head to the heart.
32. What causes black quarter in cattle?
[A] Euphorbia tirucalli
[B] Clostridium chauvoei
[C] Bacillus anthracis
[D] None of these
Show Answer
Correct Answer: B [Clostridium chauvoei]
Notes:
Clostridium chauvoei causes black quarter in cattle. It is an acute and highly fatal disease.
33. Which of the following are examples of harmful microbes?
[A] Streptococcus Pyogenes
[B] Escherichia Coli
[C] Pseudomonas Aeruginosa
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Streptococcus Pyogenes, Escherichia Coli, and Pseudomonas Aeruginosaare examples of harmful microbes. They can be transmitted through a variety of mediums in our bodies.
34. 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.
35. Which of the following is a mobile genetic element?
[A] virus
[B] bacteria
[C] Transposons
[D] insertion sequence
Show Answer
Correct Answer: C [Transposons ]
Notes:
A transposon is a mobile genetic element. This is also known as jumping genes. A type of genetic material that can move around within a genome is called a mobile genetic element.
36. The colour change in the Chameleon is due to the presence of ____:
[A] Chromatophore
[B] Haemoglobin
[C] Chlorophyll
[D] Pneumatophore
Show Answer
Correct Answer: A [Chromatophore]
Notes:
Chameleons have specialized cells, chromatophores, which contain pigments in their cytoplasm, in three layers below their transparent outer skin. Dispersion of the pigment granules in the chromatophores sets the intensity of each color. Chromatophores contain pigments and reflect light, which are responsible for creating coloration. In chameleons, there are four types of chromatophores: xanthophores, erythrophores, iridiophores, and melanophores (Cooper and Greenberg, 1992).
37. Dumb-bell shaped guard cells are present in
____:
[A] Mango
[B] Wheat
[C] Gram
[D] Groundnut
Show Answer
Correct Answer: B [Wheat]
Notes:
Monocost and dicots differ in the location of stomata and shape of guard cells. In monocots stomata are Dumb-bell shaped in dicots they are bean-shaped.
38. Which one of the following is not a true fish?
[A] Jellyfish
[B] Starfish
[C] Cuttlefish
[D] All of the above
Show Answer
Correct Answer: D [All of the above ]
Notes:
The term fish is most strictly used to describe any animal with a backbone that has gills throughout life and has limbs, if any, in the shape of fins. Many types of aquatic animals commonly referred to as fish are not fish in this strict sense; examples include shellfish, cuttlefish, starfish, crayfish and jellyfish.
39. Which of the digestive organs contains acid?
[A] Stomach
[B] Colon
[C] Small intestine
[D] Appendix
Show Answer
Correct Answer: A [Stomach]
Notes:
Gastric acid, gastric juice or stomach acid, is a digestive fluid, formed in the stomach. It is composed of hydrochloric acid (HCl), potassium chloride (KCl) and sodium chloride (NaCl). Gastric acid plays a key role in digestion of proteins, by activating digestive enzymes.
40. Which type of plants have weak stems and take support on neighbouring structures to climb up?
[A] Climbers
[B] Herbs
[C] Trees
[D] Shrubs
Show Answer
Correct Answer: B [Herbs]
Notes:
There are some plants with weak stems that cannot stand upright and spread on the ground. These are called creepers, while those that take support on neighbouring structures and climb up are called climbers. Money plant, gourd plant, etc are examples of climbers.
