1. Which of the following correctly defines “Mother-of-pearl”?
[A] An oyster which yields the pearl
[B] A special large sized pearl found in Japan
[C] A hard iridescent substance forming the inner layer of certain shells
[D] Female individuals of certain species of shelled mollusk
Show Answer
Correct Answer: C [ A hard iridescent substance forming the inner layer of certain shells ]
Notes:
Nacre also known as mother of pearl, is an organic-inorganic composite material produced by some mollusks as an inner shell layer; it is also what makes up the outer coating of pearls. It is strong, resilient, and iridescent.
2. Blood Plasma with which among the following removed is called Serum?
[A] Fibrin
[B] Thrombin
[C] Fibrinogen
[D] Collagen
Show Answer
Correct Answer: C [Fibrinogen]
Notes:
Plasma is 55% of the blood by volume and constitutes 5% of the body weight. Plasma is a pale yellow transparent clear fluid which consists of 90-92% water and 8-10% organic and inorganic substances. Organic substances are mainly plasma proteins viz. albumin, globulin, prothrombin and fibrinogen. Albumins are responsible for maintenance of osmotic pressure of Blood. Globulins are chief sites for formation of antibodies; while prothrombin and fibrinogen are essential for clotting of blood
3. Which among the following has a fibrous root?
[A] Grass
[B] Mize
[C] Carrot
[D] Rice
Show Answer
Correct Answer: A [Grass]
Notes:
A fibrous root system is universal in monocotyledonous plants and ferns. It is the opposite of a taproot system and usually formed by thin, moderately branching roots growing from the stem. Fibrous root system is present in grass.
4. Kwashiorkor disease is caused by the deficiency of which of the following ?
[A] Vitamins
[B] Proteins
[C] Fats
[D] Minerals
Show Answer
Correct Answer: B [Proteins]
Notes:
Kwashiorkor disease is caused by the deficiency of proteins. It is also known as “edematous malnutrition”. It is a nutritional disorder most often observed in regions experiencing famine.
5. Which among the following is correct regarding Hemophilia?
[A] the disease is carried by females and expressed by males
[B] the disease is carried by males and expressed by females
[C] the disease is carried by males & females and expressed by males
[D] none of the above
Show Answer
Correct Answer: A [the disease is carried by females and expressed by males]
Notes:
Hemophilia is an inherited bleeding disorder in which a person lacks or has low levels of certain proteins called “clotting factors” and as a result, the blood doesn’t clot properly. Clotting factor is a protein in blood that controls bleeding. If you have hemophilia, you may bleed for a longer time after an injury than you would if your blood clotted normally. Hemophilia is quite rare. About 1 in 10,000 people are born with it.
6. Which among the following is / are correct regarding a mature sperm and ovum?
[A] They both are of approximately same size
[B] They both have equal number of Chromosomes
[C] They both contain flagella
[D] None of the above
Show Answer
Correct Answer: B [They both have equal number of Chromosomes]
Notes:
The number of chromosomes is reduced from 46 (23 pairs) to 23 during the process of meiosis. In a human egg or sperm, there are 23 chromosomes, one of which is an X or Y. A human egg is haploid (has 23 chromosomes) and a sperm is haploid (has 23 chromosomes).
7. The pitcher plant is characterized by which of the following plants ?
[A] Autotrophes
[B] Insectivorous
[C] Allergen
[D] None of the above
Show Answer
Correct Answer: B [Insectivorous]
Notes:
The pitcher plant is characterized as insectivorous. Pitcher plants are several different carnivorous plants. They have modified leaves known as pitfall traps which is a prey-trapping mechanism featuring a deep cavity filled with digestive liquid.
8. Which of the following plants have respiratory roots?
[A] Marshy Plants
[B] Mangroves
[C] Epiphytes
[D] Submerged Hydrophytes
Show Answer
Correct Answer: B [Mangroves]
Notes:
Respiratory roots are found in aquatic plants and plants which grow on marshy areas. In mangroves the roots are not getting sufficient oxygen and hence they grow upwards from the ground.
9. Who put forward the “Theory of Evolution”?
[A] Aristotle
[B] Charles Darwin
[C] Louis Pasteur
[D] Isaac Newton
Show Answer
Correct Answer: B [Charles Darwin]
Notes:
“Theory of Evolution” which is also referred to as the theory of “survival of the fittest”, was proposed by Charles Darwin in On the Origin of Species in 1859 and, independently, by Alfred Wallace in 1858—although Wallace, unlike Darwin, said the human soul is not the product of evolution.
10. Which among the following has segmented body?
[A] Phylum Mollusca
[B] Phylum Arthopoda
[C] Phylum Annelida
[D] Phylum Coelenterata
Show Answer
Correct Answer: C [Phylum Annelida]
Notes:
Annelids contain largely segmented bodies with each segment containing elements of the different body systems essential for life, such as the nervous system. Earthworms, ringed worms and leeches all fall into the annelida category.
