Zoology - Online Test
Q1. Scrotal sacs of man and rabbit are connected with the abdominal cavity by
Answer : Option B
Explaination / Solution:
Scrotal sac contains testes in male. Scrotal sacs are connected with the abdominal cavity by inguinal canal which is a passage in the anterior abdominal wall which in man conveys the spermatic cord.
Q2. Identify the correct pairing between nitrogen bases in DNA.
Answer : Option C
Explaination / Solution:
There are two hydrogen bonds between A and T pairing. There are three hydrogen bonds between G andC pairing. Each strand appears like a helical staircase.
Q3. Which one of the following is used as biological insecticide?
Answer : Option D
Explaination / Solution:
Tiger beetle is a large group of beetles known for their aggressive predatory habits and running speed. They are used as biological insecticides in organic farming practices.
Q4.
When a person suffers from chest pain :
i. the reason for this suffering is decreased blood flow and simultaneously lowered oxygen supply to an area of the heart.
ii. deprived of oxygen, myocardium opts for alternative pathways i.e. anaerobic respiration and its byproduct ethanol causes the pain.
Answer : Option D
Explaination / Solution:
A symptom of acute chest pain appears when no enough oxygen is reaching the heart muscle.
Q5. The cultivation of a single cash crop in plantations or estates (large areas of land) on a large scale(in the whole year)is called plantational farming and example is/are
Answer : Option B
Explaination / Solution:
Plantation agriculture is a form of commercial farming where crops are grown for sale. Some crops are sold as raw materials to manufacturing industries or partially processed and value added before selling the products to large companies for further processing. Example of plantational farming is rubber plantation, tea plantation etc.
Q6.
Arrange the order of events taking place in anaphase II stage of meiosis:
a. Metaphase plate spilts
b. Each chromosome moves away from equatorial plane
c. Centromeres split and chromatids separate.
d. Chromatids move to opposite poles
Answer : Option B
Explaination / Solution:
During anaphase stage, metaphase plate splits and each chromosome moves away from equatorial plane splitting the centromere and separate chromatids which move to opposite poles.
Q7. EtbR fluoresces in UV light because
Answer : Option A
Explaination / Solution:
Ethidium bromide is a molecule commonly used to visualize DNA in agarose gel electrophoresis experiments. It both binds to DNA and fluoresces under the proper conditions. Ethidium bromide is known as an intercalating agent. The flat structure of ethidium bromide allows it to intercalate, or insert, between nitrogenous bases of a DNA molecule. This interaction is especially useful because of ethidium bromide's second characteristic. When it is exposed to ultraviolet light, ethidium bromide fluoresces. Thus, this chemical provides both a means of tagging DNA molecules and a means of visualizing them.
Q8. Diabetes insipidus is caused due to :
Answer : Option D
Explaination / Solution:
Diabetes insipidus is rate variety of diabetes characterized by excessive thrust and excretion of large amount of urine. It is caused due to reduced secretion of antidiuretic hormone (ADH) or vasopressin hormone.
Q9. Big bang theory try to explain
Answer : Option A
Explaination / Solution:
The Big Bang is a scientific theory about how the universe started, and then made the stars and galaxies we see today.
It tries to explain the origin of universe. It told us about the singular large explosion unimaginable in physical term.
Q10. Identify the correct binomial nomenclature of Mango
Answer : Option C
Explaination / Solution:
Biological name of an organism consists of genus name and species name. the correct biological nomenclature of Mango is Mangiferindica Linn.
