Biology - Online Test
Q1. A grown up cell divides when a maximum size is attained and which disturb the
Answer : Option B
Explaination / Solution:
A disturbance in the nucleoplasmic ratio will cause the cell to divide and attain stable ration which is 1. If it is less or more than 1 the cell becomes unstable and divides agin.
Q2. Single step large mutation is called
Answer : Option A
Explaination / Solution:
Evolution for Darwin was gradual while deVries believed mutation caused speciation. The single large mutation is called saltation.
Q3. Specimens are preserved in the containers or jars in preservative solutions in
Answer : Option A
Explaination / Solution:
Specimens are preserved in the containers or jars in preservative solutions in museum.
Q4. A mother of one year old daughter wanted to space between her children. The best contraceptive method she should use is
Answer : Option B
Explaination / Solution:
Copper-T is a contraceptive method under intra uterine contraceptive device which prevents the implantation and reduce the motility of sperm. It is implanted inside the uterus and works up to five years. So, it is the best method for spacing between two children.
Q5. 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.
Q6. 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.
Q7. 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.
Q8. 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.
Q9. 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.
Q10. 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.
