1. Which of the following bacteria forms an endosymbiotic nitrogen fixing association with roots of legumes that helps in Nitrogen Fixation?
[A] Clostridium
[B] Rhizobium
[C] Salmonella
[D] Staphylococcus
Show Answer
Correct Answer: B [Rhizobium]
Notes:
Rhizobium Found in roots of legumes, like Peas, grams, Pulses etc, where it fixes atmospheric nitrogen as ammonia, which is then converted into useful amino acid.
2. Enteric fermentation is fermentation that takes place in the digestive systems of ruminant animals. It is one of the reasons for increased ________emissions?
[A] Carbondioxide
[B] Methane
[C] Ammonia
[D] Sulphur
Show Answer
Correct Answer: B [Methane]
Notes:
Enteric fermentation is a digestive process that takes place in the digestive systems of ruminant animals by which carbohydrates are broken down by microorganisms into simple molecules for absorption into the bloodstream of an animal.
3. Which among the following is a correct definition of Hematocrit?
[A] proportion of blood volume that is occupied by red blood cells
[B] proportion of blood volume that is occupied by white blood cells
[C] proportion of blood volume that is occupied by Leucocytes and Thromobocytes
[D] proportion of blood volume that is occupied by plasma
Show Answer
Correct Answer: A [proportion of blood volume that is occupied by red blood cells]
Notes:
Hematocrit levels are used in doping tests of Athletes , (the RBCs are carriers of Oxygen). hematocrit levels also denotes the blood iron. hematocrit levels of 38 or higher are normally suitable for the donors to donate their blood. Here please note that sometimes its is asked in exams about the ion which can help better in blood coagulation and normally options given are Ca, Na, K & Fe+3. The obvious answer is Fe+3.
4. The Bovine spongiform encephalopathy (BSE) is commonly known as _______?
[A] Foot & Mouth Disease
[B] Mad Cow Disease
[C] Fog fever
[D] Creutzfeldt-Jakob disease
Show Answer
Correct Answer: B [Mad Cow Disease]
Notes:
The Bovine spongiform encephalopathy (BSE) is commonly known as Mad Cow Disease. It is a brain disorder in an adult cattle that may be spread to humans through diseased meat.
5. The bacterium ‘Escherichia coli’ is found mainly in:
[A] Human Intestine
[B] Pteridophytes
[C] Root Nodules of leguminous plants
[D] Paddy fields for nitrogen fixation
Show Answer
Correct Answer: A [Human Intestine]
Notes:
Escherichia coli, also known as E. coli, is a Gram-negative, facultative anaerobic, rod-shaped, coliform bacterium of the genus Escherichia. It is a type of bacteria that normally lives in your intestines.
6. Which of the following is most inclusive category of classification among others?
[A] Order
[B] Class
[C] Phylum
[D] Family
Show Answer
Correct Answer: C [ Phylum ]
Notes:
The higher the classification category, the more inclusive it is. Here phylum is highest so is most inclusive.
7. Which process develops new species from the existing species?
[A] Homologous
[B] Analogous
[C] Speciation
[D] Genetic variation
Show Answer
Correct Answer: C [Speciation]
Notes:
Speciation is the formation of new species. Speciation is the evolutionary process by which populations evolve to become distinct species. The biologist Orator F. Cook coined the term in 1906 for cladogenesis, the splitting of lineages, as opposed to anagenesis, phyletic evolution within lineages.
8. Entomology is associated with the study of which of the following?
[A] Behavior of human beings
[B] Insects
[C] The origin and history of technical and scientific terms
[D] The formation of rocks
Show Answer
Correct Answer: B [Insects]
Notes:
Entomology is the scientific study of insects, a branch of zoology. In the past the term “insect” was more vague, and historically the definition of entomology included the study of terrestrial animals in other arthropod groups or other phyla, such as arachnids, myriapods, earthworms, land snails, and slugs.
9. What is the name of a group of similar cells performing a specific function?
[A] Tissue
[B] Organ
[C] Organ system
[D] Cellular organization
Show Answer
Correct Answer: A [Tissue]
Notes:
A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.
10. Which of the following is the first formed primary xylem elements?
[A] Protoxylem
[B] Xylem parenchyma
[C] Metaxylem
[D] Xylem fibres
Show Answer
Correct Answer: A [Protoxylem]
Notes:
Protoxylem is the first part of the primary xylem that matures and these cells are usually smaller than the metaxylem. Metaxylem is the part of the primary xylem that differentiates after the protoxylem and these cells are usually larger than the protoxylem.
