Zoology - Online Test
Q1. How many sperms are formed by 4 primary spermatocytes?
Answer : Option A
Explaination / Solution:
Each primary spermatocyte undergoes first meiotic division to produce 2 secondary spermatocytes, which further proceeds to second meiotic division to form 2 spermatids. So, each primary spermatocyte produces 4 sperms.
Q2. Deforestation generally decreases
Answer : Option D
Explaination / Solution:
Deforestation generally decreases rainfall. Plants release water in form of water vapour in the process of transpiration. The water vapour contribute in cloud formation to bring rains.
Q3. Plant mitosis is generally controlled by
Answer : Option D
Explaination / Solution:
In plant cell, mitosis cell division is generally controlled by cytokinin hormone. It increase the rate of cell division leading to increased cell production. Auxinis also required for cell division in plant.
Q4. Which of the following is an example of genetic variation?
Answer : Option B
Explaination / Solution:
Genetic variation is the difference in the offspring of same parents produce sexually. The children of same parents having different eye colour is an example of genetic variation. Age, scar and eating habits are not genetic variation.
Q5. Carolus Linnaeus is associated with
Answer : Option D
Explaination / Solution:
Carolus Linnaeus is associated with Binomial nomenclature in which name of the organism consists of genus name and species name.
Q6. Which one is not a side effect due to regular use of contraceptive methods
Answer : Option C
Explaination / Solution:
Regular use of contraceptive methods may cause some side effects such as abdominal pain, breast cancer and nausea. AIDS is a viral disease caused by HIV and not a side effect of contraceptive method.
Q7. The number of nymphs produced from single ootheca of frog is
Answer : Option A
Explaination / Solution:
Young ones of frogs are called nymphs. When the ootheca ruptures, 16 nymphs come out.
Q8. Identify the cuboidal virus from the following
Answer : Option B
Explaination / Solution:
Virus consists of genetic material (DNA or RNA) surrounded by protein capsules. They are of different shapes and size. Polymyelitis virus is cubical in shape.
Q9. According to the lac-operon concept, which functional unit of the bacterial gene material is responsible for suppressing the activity of the operator gene in the absence of lactose?
Answer : Option D
Explaination / Solution:
A regulator gene is a gene that codes for a repressor protein that inhibits the activity of an operator gene (a gene which binds repressor proteins thus inhibiting the translation of RNA to protein via RNA polymerase). In prokaryotes, regulator genes often code for repressor proteins.
Q10. The developing sperms are nourished by
Answer : Option D
Explaination / Solution:
Seminiferous tubules contain Spermatogonia and Sertoli cells. Spermatogonium undergoes meiotic division to produce sperms and Sertoli cells provide nourishment to them.
