Biology - Online Test
Q1. 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.
Q2. 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.
Q3. 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.
Q4. 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.
Q5. Forest act was first enacted in
Answer : Option B
Explaination / Solution:
An Act to consolidate the law relating to forests, the transit of forest-produce and the duty leviable on timber and other forest-produce. The Indian Forest Act, 1927 was largely based on previous Indian Forest Acts implemented under the British.
Q6. During mitosis ER and nucleolus begin to disappear at
Answer : Option C
Explaination / Solution:
During mitosis ER and nucleolus begin to diappear at late prophase stage indicated the beginning of next phase. It happens due to increased divisional activities of nucleus.
Q7. The tendency of population to remain in genetic equilibrium may be disturbed by
Answer : Option C
Explaination / Solution:
The tendency of population to remain in genetic equilibrium may be disturbed by lack of random mating due to ethics and geographical or other barriers.
Q8. Which one is a obligate category of classification?
Answer : Option D
Explaination / Solution:
Family is the obligate category of classification as it forms the basic functional unit of classification. Family includes all the related species having similar charecters.
Q9. Vasectomy is a surgical method of birth control performed in
Answer : Option B
Explaination / Solution:
Vasectomy is surgical method of birth control in male in which vas deference is cut and tides to prevent release of sperm during coitus. This method cannot be reversed back.
Q10.
Match the following with reference to frog
Column I
a) Medulla oblongata
b) Smell
c) Touch
d) Cranial nerves
Column II
i) Sensory papillae
ii) PNS
iii) Foramen magnum
iv) Nasal epithelium
Answer : Option B
Explaination / Solution:
The medulla oblongata passes out through the foramen magnum and continues into spinal cord, which is enclosed in the vertebral column. Frog has different types of sense organs. This includes organs of touch (sensory papillae) and smell (nasal epithelium). The nervous system is organized into a central nervous system including brain and spinal cord and peripheral nervous system (PNS) including cranial and spinal nerves.
