Biology - Online Test
Q1. Regurgitation is more common in infants than in adults. The reason will be:
Answer : Option C
Explaination / Solution:
Regurgitation is the expulsion of material from the pharynx, or esophagus, usually characterized by the presence of undigested food or blood. Regurgitation is used by a number of species to feed their young. Regurgitation is more common in infants than adults because cardiac sphincter is much less effective in infants.
Q2. Self-pollination is transfer of pollen from anther to stigma of
Answer : Option B
Explaination / Solution:
The transfer of pollen grain from anther to stigma of same flower is called self-pollination. Both anther and stigma must be ready at same time for this kind of pollination.
Q3. The formation of both peptide and glycosidic bonds involves
Answer : Option C
Explaination / Solution:
In a polypeptide or a protein, amino acids are linked by a peptide bond which is formed when the carboxyl (-COOH) group of one amino acid reacts with the amino (-NH2) group of the next amino acid with theelimination of a water moiety (the process is called dehydration). In polysaccharide the individual monosaccharides are linked by a glycosidic bond. This bond is also formed by dehydration.
Q4. A metastatic cancerous tissue is termed ‘sarcoma’ if the disorder is in
Answer : Option A
Explaination / Solution:
A metastatic cancerous tissue is called sarcoma if the disorder is in fibroblast. The property of cancerous cells to reach from one part of the body to other through blood is called metastasis.
Q5. Select the incorrect matching
Answer : Option C
Explaination / Solution:
The nucleus contains the chromosomes which in turn contain the genetic material, DNA.
Q6. A gene of operon which synthesizes a repressor protein is
Answer : Option C
Explaination / Solution:
No Explaination.
Q7. The number of Oxygen molecules released per photon or quantum of light is called
Answer : Option A
Explaination / Solution:
Quantum yield is the number of Oxygen molecules released per photon or quantum of light. During light reaction of photosynthesis oxygen molecules are release during photolysis.
Q8. Large proportion of cultivated plants are
Answer : Option A
Explaination / Solution:
Cultivated plants are mostly allopolyploids that contain multiple sets of genetic material in their cells. Bread wheat is generally hexaploid. Allopolyploids occurs due to faulty karyokinesis.
Q9. Endemics of western Ghats include
Answer : Option B
Explaination / Solution:
Endemism is the ecological state of a species being unique to a defined geographic location, such as an island, nation, country or other defined zone, or habitat type.
Notable endemics are the Nilgiri leaf monkey and the brown and carmine Beddome's toad of the Western Ghats.
Q10. A reptile having four chambered heart is
Answer : Option B
Explaination / Solution:
Reptiles generally possess three chamber heart, two upper chamber and single lower chamber. But in crocodile, the heart is four chambered having two atrium and two ventricles.
