Zoology - Online Test
Q1. The sequence of structural gene in lac operon concept is
Answer : Option A
Explaination / Solution:
In lac operon concept the sequence of arrangement of structural gene is as lac Z, lac Y and lac A. The z gene codes for beta-galactosidase. The y gene code for permease and a gene encodes a transacytylase.
Q2. A human female is born with a million of primary oocytes at the time of birth. How many eggs get a chance to mature?
Answer : Option B
Explaination / Solution:
Girls are born with 200-300 millions of primary oocytes but all of these oocytes do not get chance to mature and change into ovum because one ovary produce only one ovum each month in the middle of menstrual cycle. So, about 500 eggs are released by female during her reproductive life.
Q3. Deforestation does not lead to
Answer : Option A
Explaination / Solution:
Deforestation does not lead to quick nutrient cycling but it may leads to soil erosion, alteration of local weather conditions and destruction of natural habitat of wild animals.
Q4. Which type of cell division helps in regeneration?
Answer : Option A
Explaination / Solution:
Regeneration is the ability of organism to regain its lost body parts. Regeneration is achieved by mitotic cell division to maintain same number of chromosomes in the cell.
Q5. Which of the following sentences is incorrect about microspheres?
Answer : Option D
Explaination / Solution:
Microspheres are molecules developed during organic evolution. They do not have all properties of life. They are composed of protein molecule and form buds to develop smaller microspheres.
Q6. The existence of a wide range of different types of organisms in a given place at a given time is
Answer : Option D
Explaination / Solution:
The parks and zoo are the places where wild animals are kept in protected environments under human care. Museums have collections of preserved plant and animal specimens for study and reference. Hence, the correct option is Biodiversity.
Q7. Absence of menstruation during period of intense lactation following parturition is called as
Answer : Option A
Explaination / Solution:
During intense lactation just after the delivery the menstrual cycle get stopped and there is no chance of pregnancy. This absence of menstruation is called lactational amenorrhea.
Q8. Removal of RNA polymerase III from nucleoplasm will affect the synthesis of
Answer : Option B
Explaination / Solution:
During transcription of m-RNA, removal of RNA polymerase III form nucleoplasm will affect the synthesis of t-RNA. The t-RNA transfers the amino acids to the site of translation to form protein.
Q9. Five oogonia yield 10 primary oocytes, then how many ova are produced on completion of oogenesis?
Answer : Option B
Explaination / Solution:
Each oogonium produces one ovum at the end of oogenesis process and three polar bodies. Thus, five oogonia will produce five ova at the completion of oogenesis process.
Q10. Jhum cultivation refers to
Answer : Option A
Explaination / Solution:
Jhum cultivation refers to tribal method of shifting cultivation by clearing forest for agriculture again and again. It is an act of deforestation.
