Biology - Online Test
Q1. Which of the following statements are not correct?
Answer : Option D
Explaination / Solution:
A nucleic acid containing deoxyribose is called deoxyribonucleic acid (DNA) while that which contains ribose is called ribonucleic acid (RNA).
Q2. In human males, some recessive genes express their effect because
Answer : Option D
Explaination / Solution:
Recessive genes are expressed only in case of homozygous condition but sex chromosomes of males do not have opposite alleles on Y-chromosome. So, the recessive gene located on X-chromosome get expressed in males.
Q3. The biological control of agricultural pests, unlike chemical control is
Answer : Option C
Explaination / Solution:
The biological control of agricultural pest, unlike chemical control is called self-perpetuating as biological control has power to renew or perpetuate oneself of itself for indefinite length of time.
Q4. For a healthy individual, calculate stroke volume for him if other values are; heart beat per minute = 72 and cardiac output is 5 litre?
Answer : Option B
Explaination / Solution:
E Stroke volume of healthy individual can be calculated by dividing cardiac output by number of heart beat per minute. So stroke volume = 5/ 72 = 0.0694.
Q5. Energy releasing enzymatically controlled catabolic process which involves step-wise oxidative breakdown of organic substance inside living cells is called
Answer : Option B
Explaination / Solution:
Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
Q6. In which year did the scientists report largest ozone hole in the atmosphere?
Answer : Option A
Explaination / Solution:
From September 21 to 30, 2006 the average area of the ozone hole was the largest ever observed, at 10.6 million square miles. It is called as Antarctic ozone hole.
Q7. Synapsis occurs between
Answer : Option C
Explaination / Solution:
Synapsis occur between two homologous chromosome during zygotene phase of prophase of meiosis I due to presence of synaptonemal complex between homologous chromosomes.
Q8. The DNA fragments in an agarose gel at the same position signify that the two fragments have
Answer : Option C
Explaination / Solution:
Gel electrophoresis is a technique used to separate DNA fragments (or other macromolecules, such as RNA and proteins) based on their size and charge. Electrophoresis involves running a current through a gel containing the molecules of interest. Based on their size and charge, the molecules will travel through the gel in different directions or at different speeds, allowing them to be separated from one another.
The DNA fragments in an agarose gel at the same position signify that the two fragments have same molecular weight and travel same distance.
Q9. People with chronic kidney disease are usually affected by anemia. It happens because damaged kidney doesn’t secrete sufficient :
Answer : Option A
Explaination / Solution:
The person suffering from chronic kidney disease are usually affected by anemia. The damage kidney is not able to secrete sufficient erythropoietin in blood that help in absorption of iron.
Q10.
Which of the following statements are correct about origin of earth?
a. There was no atmosphere on early earth.
b. Water vapour, methane, carbon dioxide and ammonia are released from molten mass covered the earth.
c. Oxygen gas is released from plants during photosynthesis.
Answer : Option C
Explaination / Solution:
There was no atmosphere on early earth. Water vapour, methane, carbon dioxide and ammonia are released from molten mass covered the earth. Oxygen and hydrogen gas is formed by splitting of water by UV rays.
