Biology - Online Test
Q1.
Muscular dystrophy is a genetic disorder.
i. It is genetically inherited.
ii. Some people get affected by MD due to mutated dystrophin gene and nutritional defects at the pre-natal age.
iii. Predominantly males are affected by DMD although females can be carriers of it.
iv. Dystrophin is a protein found in tendons.
Answer : Option D
Explaination / Solution:
Muscular dystrophy is a genetic disorder and genetically inherited. It may also occurs due to mutated dystrophin gene and nutritional defects at the pre-netal age. Males are more affected by MD although females can be carriers of it.
Q2. The organization set up by Indian government for making decisions regarding validity of GM research is
Answer : Option C
Explaination / Solution:
The Genetic Engineering Appraisal Committee (GEAC) is the apex body constituted in the Ministry of Environment and Forests under 'Rules for Manufacture, Use, Import, Export and Storage of Hazardous Microorganisms/Genetically Engineered Organisms or Cells 1989', under the Environment Protection Act, 1986.
Q3. First human population explosion took place due to
Answer : Option D
Explaination / Solution:
First human population explosion occurred due to agriculture system in which people start living together in colonies. They felt the need for more labour powere to perform different agricultural practices.
Q4. Muscle forming cells are called
Answer : Option C
Explaination / Solution:
The muscle forming cells are called myoblasts cells. Myoblast is a type of embryonic progenitor cell that differentiates to give rise to muscle cells.
Q5. Plants complete their life cycle in two phase, saprophytic and gametophytic which occurs alternately called
Answer : Option D
Explaination / Solution:
The multicellular haploid plant structure is called the gametophyte, which is formed from the spore and give rise to the haploid gametes. The fluctuation between these diploid and haploid stages that occurs in plants is called the alternation of generations.
Q6. Bulk flow can be achieved by
Answer : Option C
Explaination / Solution:
Bulk flow can be achieved either through a positive hydrostatic pressure gradient (e.g., a garden hose) or a negative hydrostatic pressure gradient (e.g., suction through a straw).
Q7. Assertion: The portion of embryonal axis above the level of cotyledon is epicotyl.
Reason: Epicotyl terminates at with lower end in the radicle or root tips.
Reason: Epicotyl terminates at with lower end in the radicle or root tips.
Answer : Option B
Explaination / Solution:
In embryo, the portion of embryonical axis above the level of cotyledon is epicotyl which terminates with Plumule or stem tips above the above the level of cotyledons,
Q8. How will you represent a stable population?
Answer : Option C
Explaination / Solution:
Stable populations are theoretical models widely used by demographers to represent and understand the structure, growth and evolution of human populations. By definition, stable populations have age-specific fertility and mortality rates that remain constant over time.
Age pyramids generally shows age distribution of male and female in combined diagram. The stble population shows a bell shaped polygon.
Q9. Grey spots of Oat are due to deficiency of
Answer : Option C
Explaination / Solution:
Manganese deficiency in Oat appear as grey spots on leaves of oat. Rate of photosynthesis is also influenced by the Manganese elements.
Q10. All are digestive glands except :
Answer : Option A
Explaination / Solution:
Liver, pancrease and salivary gland are digestive gland that release enzymes for digestion of food but thyroid gland release thyroxin hormone that help in metabolism of carbohydrates, proteins and fats.
