1. What is the main function of Lymphocytes?
[A] Production of Antibodies
[B] Production of Antigens
[C] Production of White Blood Cells
[D] All of the above
Show Answer
Correct Answer: A [Production of Antibodies]
Notes:
Lymphocytes are a type of white blood cell that are part of the immune system. Their main function is to produce antibodies that protect the body from foreign invaders, such as viruses, bacteria, and toxins. These antibodies help the body respond to and eliminate foreign invaders, which provides protection against infectious diseases.
Lymphocytes also help the body’s immune system remember every antigen it comes in contact with. After an encounter, some lymphocytes turn into memory cells.
There are two main types of lymphocytes: B cells and T cells. B cells produce antibodies that attack invading bacteria, viruses, and toxins. T cells destroy the body’s own cells that have been taken over.
If you have low numbers of lymphocytes (lymphopenia), you are at higher risk of infection. Symptoms can range from mild to serious and are correlated to the severity of the lymphopenia as well as its duration. Some people have no symptoms.
2. The shape of Vibrio bacteria is ________?
[A] Comma Shaped
[B] Dot shaped
[C] Clusters
[D] Sticks
Show Answer
Correct Answer: A [Comma Shaped]
Notes:
The shape of Vibrio bacteria is comma shaped. These bacteria naturally live in certain coastal waters and are present in higher concentrations between the months of May and October when water temperatures are warmer.
3. Prophase, metaphase, anaphase & telophase are the stages of which of the following process?
[A] Mitosis / Meiosis
[B] Asexual reproduction
[C] sexual reproduction
[D] Cell metabolism
Show Answer
Correct Answer: A [Mitosis / Meiosis]
Notes:
Mitosis is a fundamental process for life. During mitosis, a cell splits to form two identical daughter cells by duplicating all of its contents, including its chromosomes. Prophase, metaphase, anaphase & telophase are the stages of
Mitosis.
4. Which among the following helps to determine the character of a cell?
[A] Nucleus
[B] Chromosomes
[C] Genes
[D] Plasma
Show Answer
Correct Answer: C [Genes]
Notes:
Genes helps to determine the character of a cell. Gene is the basic physical and functional unit of heredity and are made up of DNA. Some of the genes act as instructions to make molecules called proteins.
5. Which among the following is correct definition of Bacteriophage?
[A] A Bacteria that destroys Virus
[B] A Virus that destroys Bacteria
[C] A Bacteria that destroys another bacteria
[D] A Bacteria that destroys Fungi
Show Answer
Correct Answer: B [A Virus that destroys Bacteria]
Notes:
Bacteriophage a virus that parasitizes a bacterium by infecting it and reproducing inside it. Bacteriophages are commonly used in genetic research. They are composed of proteins that encapsulate a DNA or RNA genome, and may have structures that are either simple or elaborate.
6. Which of the following is the correct definition of the Primary Productivity?
[A] Rate of photosynthesis in plants and photosynthetic bacteria as compared to the rate of plant consumption by herbivores
[B] Total amount of light energy converted to organic compounds in a given area per unit time.
[C] Rate of decomposition by the detritivores.
[D] Total biomass of the photosynthetic organisms in the ecosystem.
Show Answer
Correct Answer: B [ Total amount of light energy converted to organic compounds in a given area per unit time.]
Notes:
B is the correct answer.
7. Which of the following drug is an antihistamine?
[A] Dimetapp
[B] Seldane
[C] Cetrizine
[D] All of the above
Show Answer
Correct Answer: D [ All of the above]
Notes:
All of the above belongs to a class of drugs known as antihistamines. They interfere with the natural action of histamine by competing with histamine for binding sites of receptor where histamine exerts its effect.
8. What is that gene called which have two or more than two characters?
[A] Duplicate gene
[B] Pleiotropic gene
[C] Polymeric gene
[D] Su-HW gene
Show Answer
Correct Answer: B [Pleiotropic gene]
Notes:
A single gene may have two or more phenotypic expressions or characters. The multiple phenotypic effect of a single gene is called pleiotropism. Hence the gene associated with this phenomenon is called Pleiotropic gene.
9. Opium is a plant product obtained from which part of the plant?
[A] Roots
[B] Stem bark
[C] Dried Latex
[D] Dried leaves
Show Answer
Correct Answer: C [Dried Latex]
Notes:
The opium poppy straw is harvested from cultivation of pharmaceutical entities, the liquid or dried sap (known as opium latex that is obtained by lancing the outer surface of poppy pods) is the starting material for the clandestine production of heroin. Poppy straw is derived when latex are fully mature and dried by mechanical means.
10. What is the role of Pneumatophores?
[A] Protect plant from animals
[B] Supports plant in standing upright
[C] Get oxygen for respiration
[D] Helps plant for pollination
Show Answer
Correct Answer: C [Get oxygen for respiration]
Notes:
Pneumatophores are specialized root structures that grow out from the water surface and facilitate the aeration necessary for root respiration in hydrophytic trees such as many mangrove species.
