Biology - Online Test
Q1. Which of the following gas is found to work as a second messenger?
Answer : Option A
Explaination / Solution:
Second messengers are molecules that relay signals received at receptors on the cell surface to trigger physiological changes. Nitrogen oxide (NO) acts as second messenger.
Q2. In which of the organism, internal fertilisation is seen?
Answer : Option C
Explaination / Solution:
Most of the animals are not able to fertilize its own egg by sperms but in liver fluke, self-fertilization takes place. Earthworm also possess both male and female reproductive organ in same individual but not able to fertilize its own egg.
Q3. The vagina connects the
Answer : Option A
Explaination / Solution:
The vagina is a elastic, muscular tube that connects the cervix of the uterus to the exterior of the body. It is located inferior to uterus and posterior of the urinary bladder.
Q4. A polysaccharide present as storehouse of energy of plant tissues
Answer : Option B
Explaination / Solution:
Starch is a variant of this but present as a store house of energy in plant tissues.
Q5. In somatic cells of human beings chromosomes exists as
Answer : Option A
Explaination / Solution:
Somatic cells of human beings contain 23 pairs of chromosomes, 23 each from male and female gametes. These chromosomes always occurs as homologous chromosome as contain same kinds of trait.
Q6. The discovery that led to development of first antibiotic was made by
Answer : Option C
Explaination / Solution:
The discovery of first antibiotic was related to A.Flemming observations about the secretion of some chemicals from Penicillium notatum that prohibited the growth of bacteria.
Q7. As Soham, ages with chronic CAD the lumen of his coronary artery may get nearly completely obstructed Result is flow of blood to heart tissue is restricted such that the tissue receives inadequate supply of oxygen rich blood and this condition is diagnosed as :
Answer : Option C
Explaination / Solution:
In case of chronic CAD, the lumen of coronary artery may get nearly completely obstructed that results into restricted flow of blood to heart. The tissue receives inadequate bloods called myocardial ischemia.
Q8. Lactic acid is formed by the process of
Answer : Option C
Explaination / Solution:
Lactic acid is formed by the process of incomplete oxidation of glucose in presence of insufficient oxygen. Lactic acid is formed in muscle cells due to incomplete oxidation to cause cramps.
Q9. Potency of injury that can be caused by a radioactive isotope will not depend upon
Answer : Option A
Explaination / Solution:
Radioactive isotopes releases harmful radiations that may cause injury to health. Potency of injury will depends upon its rate of being absorbed or excreted, penetrating ability and its ionizing power and not on the place of availability.
Q10. Which one is not a significance of meiotic cell division?
Answer : Option B
Explaination / Solution:
Meiosis cell division results in halving of chromosome number in daughter cells, recombination of genes and formation of spores and gametes.
