Biology - Online Test
Q1. Monohybrid ratio is
Answer : Option D
Explaination / Solution:
Monohybrid ratio is the ratio of different phenotypic traits obtained on hybridizing single pair of trait. It is 3:1. When tall pea plant is crossed with dwarf, the offspring obtained are in 3/4 tall and 1/4 dwarf.
Q2. In plants, the gaseous exchange take place in a) Stomata b) Roots c) Stems d) Lenticles
Answer : Option B
Explaination / Solution:
Plants unlike animals have no special systems for breathing or gaseous exchange. Stomata and lenticels allow gaseous exchange by diffusion.
Q3. Ethanol is commercially produced through a particular species of
Answer : Option A
Explaination / Solution:
Saccharomyces is an yeast which is used to ferment sugar to produce ethanol in absence of oxygen or by anaerobic respiration.
Q4. A sure indicator of air pollution is
Answer : Option A
Explaination / Solution:
Bioindicators are living organisms that respond in an especially clear way to a change in the environment.
The lichens are useful bioindicators for air pollution, espeially sulfur dioxide pollution, since they derive their water and essential nutrients mainly from the atmosphere rather than from the soil.
The polluted air have very less or no lichens.
Q5. The period of pregnancy is known as
Answer : Option B
Explaination / Solution:
The duration from implantation of fertilised eggs to uterus till birth of well-developed baby is called gestation period. It is about nine months in human beings.
Q6. The root is covered at the apex by a thimble-like structure called
Answer : Option A
Explaination / Solution:
The root is covered at the apex by a thimble-like structure called the root cap.
Q7. What is the average cell cycle span for a mammalian cell?
Answer : Option D
Explaination / Solution:
All the phases of cell cycle in mammalian cell are completed in 24 hours.
Q8. Protein encoding gene expressed in heterologous host is called as
Answer : Option C
Explaination / Solution:
Recombinant Protein is a protein encoded by a gene — recombinant DNA — that has been cloned in a system that supports expression of the gene and translation of messenger RNA (see expression system). Modification of the gene by recombinant DNA technology can lead to expression of a mutant protein. Protein encoding genes are commonly described as structural or regulatory. Structural gene encodes enzymes and structural protein.
Q9. A renal corpuscle is :
Answer : Option C
Explaination / Solution:
Renal corpuscle, also called malpighian body, filtration unit of vertebrate nephrons, functional units of the kidney. It consists of a knot of capillaries (glomerulus) surrounded by a double-walled capsule (Bowman's capsule) that opens into a tubule.
Q10. Which theory explains the origin of universe
Answer : Option A
Explaination / Solution:
Origin of universe is explained by big bang theory. According to this theory, whole universe was concentrated into single sphere. Due to same unknown reason, there was explosion in it that forms different galaxies still moving away from each other.
