Biology - Online Test
Q1. Fleming, Chain and Florey were awarded the Nobel Prize in 1945 for discovery of
Answer : Option A
Explaination / Solution:
Fleming, Chain and Florey were awarded the Nobel Prize in 1945 for discovery of antibiotics. Antibiotics prevent the growth of bacteria and fungi.
Q2.
Read the following statements :
i. when the heart is not pumping blood sufficient to meet the need of the body then this state is called as heart attack.
ii. when the heart stops beating due to irreversible death of cells then this state is called as heart failure.
Answer : Option C
Explaination / Solution:
The state when the heart is not pumping blood sufficient to meet the need of the body then this state is called heart failure. When the heart muscles is suddenly damaged due to inadequate blood supply is called heart attack.
Q3. In electron transport system, the oxidation of one molecule of NADH produces
Answer : Option B
Explaination / Solution:
Oxidation of one molecule of NADH gives rise to 3 molecules of ATP, while that of one molecule of produces 2 molecules of ATP.
Q4. Which one is most toxic
Answer : Option A
Explaination / Solution:
Out of the given gases carbon monoxide is the most toxic gas as it combine with hemoglobin present in blood and reduce the oxygen carrying capacity of blood.
Q5. Which one of the following has the highest number of species in nature?
Answer : Option D
Explaination / Solution:
Insects have the highest number of species in nature. Insect belongs to arthropods family of class Mammalia. They are charecterised by jointed legs.
Q6. The plane of alignment of chromosome at metaphase is referred to as
Answer : Option B
Explaination / Solution:
The plane of alignment of the chromosomes at metaphase is referred to as the metaphase plate. This stage is also called as tetrad stage.
Q7. Helium is used in Biolistic gun as
Answer : Option A
Explaination / Solution:
Biolistic gun is used to insert the foreign DNA into the target organism. The gene gun is utilized to bombard the plant cell wall with many DNA coated metal particles by using compressed helium as the propellant.
Q8. Read the following about renal threshold :
i. The renal threshold of glucose is 180 mg/100ml of blood.
ii. If blood level of glucose exceeds 180mg, it leads to diabetes insipidus.
iii. If blood level of glucose exceeds 180mg, it leads to diabetes mellitus.
i. The renal threshold of glucose is 180 mg/100ml of blood.
ii. If blood level of glucose exceeds 180mg, it leads to diabetes insipidus.
iii. If blood level of glucose exceeds 180mg, it leads to diabetes mellitus.
Answer : Option D
Explaination / Solution:
The renal threshold is the state when glucose is present in urine. The renal threshold of glucose is 180 mg/100 ml of blood. If blood glucose level exceeds 180 mg, it leads to diabetes insipidus.
Q9. The process of evolution of different species in a given geographical area starting from a point and radiating to other geographical area is called
Answer : Option A
Explaination / Solution:
In evolutionary biology, adaptive radiation is a process in which organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges, or opens new environmental niches.
Q10. Monocotyledonous leaves are
Answer : Option B
Explaination / Solution:
Monocotyledonous leaves are isobilateral as both the lower and upper sides of the leaves are the same.
