1. Deficiency of Vitamin D causes?
[A] Rickets
[B] Night blindness
[C] Goitre
[D] None of the above
Show Answer
Correct Answer: A [Rickets]
Notes:
Deficiency of Vitamin D can lead to a loss of bone density, which can result in osteoporosis and fractures (broken bones). In children the deficient of Vitamin D can cause rickets.
2. Which among the following diseases is characterized by “complete loss of memory”?
[A] Amnesia
[B] Schizophrenia
[C] Alzheimer’s disease
[D] Parkinson’s disease
Show Answer
Correct Answer: A [Amnesia ]
Notes:
Amnesia refers to a loss of memory due to illness, injury, drug abuse or other causes.
3. Which of the following bacteria forms an endosymbiotic nitrogen fixing association with roots of legumes that helps in Nitrogen Fixation?
[A] Clostridium
[B] Rhizobium
[C] Salmonella
[D] Staphylococcus
Show Answer
Correct Answer: B [Rhizobium]
Notes:
Rhizobium Found in roots of legumes, like Peas, grams, Pulses etc, where it fixes atmospheric nitrogen as ammonia, which is then converted into useful amino acid.
4. The human musculoskeletal system consists of
[A] human skeleton
[B] bones attached to other bones with joints
[C] skeletal muscle attached to the skeleton by tendons.
[D] All the above
Show Answer
Correct Answer: D [All the above]
Notes:
The human musculoskeletal system consists of human skeleton, bones attached to other bones with joints and skeletal muscle attached to the skeleton by tendons. It permits movement of the body, maintains posture and circulates blood throughout the body.
5. Pearls are primarily composed of which of the following substances?
[A] Protein
[B] Calcium Carbonate
[C] Silica
[D] Sodium Carbonate
Show Answer
Correct Answer: B [Calcium Carbonate]
Notes:
Pearls are composed primarily of calcium carbonate, which is what gives them their unique luster. They are formed within the shell of certain mollusks as a defense mechanism against a potentially threatening irritant, such as a parasite. Over time, the mollusk continually deposits layers of calcium carbonate, which eventually forms a smooth, hard pearl. This process can take up to eight years.
6. Ornithophily refers to the pollination through which among the following?
[A] Wind
[B] Insects
[C] Birds
[D] Water
Show Answer
Correct Answer: C [Birds]
Notes:
Ornithophily refers to the pollination through birds. Birds which are involved in ornithophily are specialist nectarivores with brushy tongues and long bills, that are either capable of hovering flight or light enough to perch on the flower structures.
7. The Gram Positive Bacteria can be identified by the Gram staining because of the following reasons?
[A] The cell walls have more lipids compared to peptidoglycan
[B] The Cells walls have more Peptidoglycan compared to Lipids
[C] The Cells membrane has more fatty acids
[D] The plasma has Peptidoglycans
Show Answer
Correct Answer: B [The Cells walls have more Peptidoglycan compared to Lipids]
Notes:
The cell wall which is made up of Peptidoglycan as well as lipids gets violet due to the reaction of the CV+. After the decolorization with alcohol, the lipids gets dissolved and the bacteria with higher Peptidoglycan remain violet. These are called Gram Positive bacteria.
8. Which among the following enzyme allows the cows to digest cellulose?
[A] beta-lactase
[B] alpha-amylase
[C] beta-amylase
[D] alpha-lactase
Show Answer
Correct Answer: C [ beta-amylase]
Notes:
Correct answer is beta-amylase. Regarding amylase there is an interesting fact that it has proved its role in Human evolution. The salivary amylase levels found in the human lineage are six to eight times higher in humans than in chimpanzees, which are mostly fruit eaters and ingest little starch relative to humans.
9. Which of the following cells are closely associated and interacting with guard cells?
[A] Transfusion tissue
[B] Complementary cells
[C] Subsidiary cells
[D] Hypodermal cells
Show Answer
Correct Answer: C [Subsidiary cells]
Notes:
Subsidiary cells are the accessory cells to guard cells in the epidermis of plants. Two or four subsidiary cells are found surrounding the pair of guard cells. Subsidiary cells do not consist of chloroplasts. They provide support for the functioning of guard cells in the epidermis.
10. In a majority of flowering plants, out of the four megaspores, what is the ratio of functional and degenerate megaspores?
[A] 2:2
[B] 1:3
[C] 4:1
[D] 3:1
Show Answer
Correct Answer: B [1:3]
Notes:
At least one of the spores develop into haploid female gametophytes thus making the ratio of functional and degenerate megaspores is 1:3. Out of the four, three megaspores degenrate.
