1. Which among the following plant hormone plays most important role in establishing dormancy in seeds?
[A] Ethylene
[B] Gibberellic acid
[C] Abscisic Acid
[D] Auxin
Show Answer
Correct Answer: C [Abscisic Acid]
Notes:
Abscisic Acid plays the most important role in establishing dormancy in seeds. Abscisic Acid has also been found to be present in metazoans, from sponges up to mammals including humans.
2. Maximum number of animals species belong to which among the following groups?
[A] Mammalia
[B] Aves
[C] Pisces
[D] Arthropoda
Show Answer
Correct Answer: D [Arthropoda]
Notes:Arthropoda is the largest phylum of animal kingdom because around 2/3rd of all the named species on Earth belong to this phylum.
Ants, mosquitoes, flies, cockroaches, shrimp, crabs, spiders, scorpions etc. are examples of arthropods. There are three main classes of arthropods as follows:
- Insects: This includes mosquitoes, cockroaches, ants, flies, bees, moths, grasshoppers, beetles and butterflies
- Crustaceans: This includes crabs, lobsters, shrimp and barnacles
- Arachnids: This includes scorpions, spiders and mites
Further, a few other classes are onychophorans (velvet worms), diplopods (millipedes) and chilopods (centipedes).
3. Which among the following diseases is not caused by a virus ?
[A] Chickenpox
[B] Hepatitis
[C] Cholera
[D] Dengue
Show Answer
Correct Answer: C [Cholera]
Notes:
Cholera is an infection of the small intestine that is caused by the bacterium Vibrio cholerae
4. Which of the following Vitamin is required for Normal Blood Circulation ?
[A] Vitamin A
[B] Vitamin K
[C] Vitamin D
[D] Vitamin E
Show Answer
Correct Answer: B [Vitamin K]
Notes:
Vitamin K is required for Normal Blood Circulation. Vitamin K is a fat-soluble vitamin which plays a key role in helping the blood clot, preventing excessive bleeding.
5. How many arteries are present in Human Umbilical Cord?
[A] 1
[B] 2
[C] 3
[D] 4
Show Answer
Correct Answer: B [2]
Notes:
The umbilical cord contains Wharton’s jelly, a gelatinous substance made largely from mucopolysaccharides which protects the blood vessels inside. It contains one vein and two arteries that carries oxygenated and deoxygenated blood respectively.
6. 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.
7. In humans, fertilization normally occurs in __?
[A] Ovary
[B] Fallopian Tube
[C] Uterus
[D] Placenta
Show Answer
Correct Answer: B [ Fallopian Tube]
Notes:
In humans, fertilization normally occurs in the fallopian tube. The ovary is the female gonad that contains the eggs. The uterus is the organ that houses the developing embryo. The placenta is the structure that nourishes the embryo.
8. Who among the following is the Father of Mutation theory of evolution?
[A] Alec Jeffery
[B] T.H. Morgan
[C] Bateson
[D] Hugo de Vries
Show Answer
Correct Answer: D [Hugo de Vries]
Notes:
Alec Jeffery is known as the father of Finger Printing Technique. H. Morgan is known as the Father of Experimental Genetics. Bateson is known as the Father of modern Genetics. Hugo de Vries Father of Mutation theory of evolution.
9. How Green plants in the sea are useful for the respiration of fish?
[A] They give out oxygen
[B] They give out carbon dioxide
[C] The give out oxygen and carbon dioxide simultaneously
[D] They take oxygen and give out carbon dioxide
Show Answer
Correct Answer: A [They give out oxygen]
Notes:
Oxygen is a natural element which no animal can live without. Fish and other aquatic animals depend on oxygen gas dissolved in water as much as people depend on oxygen gas in air. Many people are surprised to learn that fish and other aquatic organisms don’t use oxygen from water molecules (H2O). This is because the single oxygen molecule (O) is bound to the two hydrogen molecules (H2) and is not useable in this form. Instead, aquatic organisms depend on dissolved oxygen gas (O2), a colorless, tasteless and odorless substance that enters the water from plants and the atmosphere.
10. The saliva helps in the digestion of which of the following materials?
[A] Starch
[B] Proteins
[C] Fibers
[D] Fats
Show Answer
Correct Answer: A [Starch]
Notes:
The digestive functions of saliva include moistening food, and helping to create a food bolus, so it can be swallowed easily. Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before food reaches the stomach.