Biology - Online Test
Q1. Amino acid + ATP →Aminoacyl-AMP + P–P , depicts
Answer : Option A
Explaination / Solution:
Amino acid activation refers to the attachment of an amino acid to its Transfer RNA (tRNA).
Aminoacyl transferase binds Adenosine triphosphate (ATP) to amino acid, PP is released. Aminoacyl transferase binds AMP-amino acid to tRNA. Activated amino acids combine with t-RNA.
Q2. The process of synthesis of ATP from ADP in the presence of light are
Answer : Option B
Explaination / Solution:
The process of which ATP is synthesised by cells (in mitochondria and chloroplasts) is named phosphorylation. Photophosphorylation is the synthesis of ATP fromADP and inorganic phosphate in the presenceof light.
Q3.
The given graph shows consumption and ventilation during exercise so we can infer from this graph :
i. During exercise, oxygen consumption rate in our body increases.
ii. Neural stimulus allows abdominal muscles , which are a kind of smooth muscle to contract to facilitate ventilation while exercising.
iii. Increase in ventilation during exercise prevents large changes in the partial pressure of or
iv. The overall impact is breathing rate increases.
Answer : Option A
Explaination / Solution:
During exercise Oxygen consumption and ventilation changes drastically. Oxygen consumption rate in our body increases during exercise. Increase in ventilation during exercise prevents large change in the partial pressure of and to increase breathing rate.
Q4. The thousands of plants obtained through micro-propagation called soma clones because
Answer : Option C
Explaination / Solution:
The method of producing thousands of plants through tissue culture is called micro-propagation. All these plants will be genetically identical to original plant from which they are grown.
Q5. A category containing those species whose members survive only in captivity or as artificially supported populations far outside their historical geographic range is grouped under:
Answer : Option A
Explaination / Solution:
A taxon known only to survive in cultivation, in captivity or as a naturalized population (or populations) well outside the past range. A taxon is presumed Extinct in the Wild when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the taxon’s life cycle and life form.
Q6. During adolescence phase, Sunil’s body became abnormally large due to excessive growth of bones of his lower jaw and limbs.This abnormality is called
Answer : Option C
Explaination / Solution:
Acromegaly is the abnormal growth of the hands, feet and face caused by over production of growth hormone by pituitary gland.
Q7. A marine cartilaginous fish that can produce electric current is
Answer : Option B
Explaination / Solution:
Torpedo is a genus of rays, commonly known as electric rays, torpedo rays, or torpedoes. They are slow-moving bottom-dwellers capable of generating electricity as a defense and feeding mechanism.
Q8. Lyding cells synthesize and secretes testicular hormone called
Answer : Option B
Explaination / Solution:
Lyding cells synthesize and secrete testicular hormones called androgens. Androgens help in development of secondary sexual characters.
Q9. Identify the incorrect pair in the following
Answer : Option B
Explaination / Solution:
Haemoglobin present in blood transport gases, RNA ( tRNA and mRNA) are involved in proteinsynthesis and steroids are used as sex stimulating chemicals but glucose is not a storage product.
Q10. The phenomenon of having more than two sets of chromosome is called
Answer : Option A
Explaination / Solution:
Polyploidy is the phenomenon of having more than two genomes or sets of chromosomes in the nucleus of cell of an organism. It may be triploid, tetraploid etc. polyploidy with odd number of genomes are sexually sterile.
