Biology - Online Test
Q1. Urethra is an 8 to 10 inch long muscular tube. The urethra passes through the prostate glands and end at the
Answer : Option C
Explaination / Solution:
Semen passes from the ejaculatory duct to the exterior of the body via urethra. The urethra passes through the prostate glands and ends at the external urethral orifice.
Q2. Which of the following nitrogenous base produces nucleoside only with ribose sugar?
Answer : Option D
Explaination / Solution:
Uracil nitrogenous base is produces nucleoside only with ribose sugar. This nucleoside is present only inside the RNA and absent in DNA.
Q3. A somatic cell in human male contains
Answer : Option B
Explaination / Solution:
Somatic cells in human male contain 22 pairs of autosomes and 1 pair (XY) of sex chromosome. Y chromosome is smaller in size and do not have allelomorphic pair of X chromosome. So, only one sex-linked gene is available for each character.
Q4. Agriculture by using only biofertilizers is called
Answer : Option C
Explaination / Solution:
Organic farming is the practice of agriculture in which no chemical substance is used as fertilizers, pesticides or insecticides. Biofertilizers are used to provide nutrient.
Q5. Mayank stood still for a long time and he felt swelling of feet. What would you suggest him :
Answer : Option D
Explaination / Solution:
During long hours of standing still swelling of feet is observe due to accumulation of blood in lower limb due to gravitation effect. This can be corrected by jerk or wriggle of legs to restart circulation properly.
Q6. In Kreb cycle conversion of succinyl-CoA to succinic acid by
Answer : Option A
Explaination / Solution:
Conversion of Succinyl-CoA to Succinate : Succinyl-CoA, like acetyl-CoA, has a strongly negative free energy of hydrolysis of its thioester bond In the next step of the citric acid cycle, energy released in the breakage of this bond is used to drive the synthesis of a phosphoanhydride bond in either GTP or ATP, and succinate is also formed in the process.
The enzyme that catalyzes this reversible reaction is called either succinyl-CoA synthetase or succinic thiokinase;
Q7. The metal which is inert and when swallowed remains non-toxic but becomes severely toxic when inhaled in volatile form:
Answer : Option A
Explaination / Solution:
Mercury is inert and when swallowed remain non-toxic but becomes severely toxic when inhaled in volatile form. It enters the respiratory system and riches to lungs to cause lung cancer.
Q8.
Which phase of meiosis in animal cell is shown in figure given below?
Answer : Option B
Explaination / Solution:
In diakinesis phase of prophase of meiosis I terminalisation of chismata takes place which is visualized in picture.
Q9. The particles used to coat with DNA in Biolistic gun is of
Answer : Option B
Explaination / Solution:
DNA is coated with tungsten before used in biolistic gun for inserting the DNA directly into target cells for obtaining particular protein.
Q10. All of the following organs help in excretion except :
Answer : Option B
Explaination / Solution:
Lungs help in excretion of carbon dioxide, liver help in excretion of toxic substance and skin help in removal of extra salts along with sweat. Heart is the organ that pumps the blood in body.
