11. 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.
12. At which of the following ages Rennin and lactase, disappear in the human body?
[A] two
[B] three
[C] five
[D] eight
Show Answer
Correct Answer: A [two]
Notes:
By the age of two, the rennin and lactase enzymes start disappearing. However, these enzymes completely disappear by the age of eight in humans. After, this the stomach of person becomes mature enough to produce pepsin to digest the food.
13. What does D stand for in the term HDL which is related with Lipoproteins ?
[A] Dopamine
[B] Density
[C] Distribution
[D] Dissolution
Show Answer
Correct Answer: B [Density]
Notes:
The High- Density Lipoprotein (HDL) is one of the five major groups of Lipoproteins. Lipoproteins are complex particles which are composed of multiple proteins that transport all fat molecules around the body within the water outside the cells.
14. A.I. Oparin is related to which of the following theories in the field of biology?
[A] Chemosynthetic theory
[B] A Theory of Life
[C] Infectious Disease Theory
[D] A Theory of the Origin of Eukaryotic Cells
Show Answer
Correct Answer: A [Chemosynthetic theory]
Notes:
The Chemosynthetic theory of origin of life was proposed by A.I. Oparin. Chemosynthetic theory states that life originated on earth through a series of collections of chemical elements in the water.
15. Which of the following vitamins was crystallized by Harry Holmes and Ruth Corbet?
[A] Vitamin A
[B] Vitamin B
[C] Vitamin C
[D] Vitamin E
Show Answer
Correct Answer: A [Vitamin A]
Notes:
Harry Holmes and Ruth Corbet isolated and crystallized vitamin A in 1937. Vitamin A is important for normal vision, the immune system, and reproduction.
16. Who has introduced Two Kingdom Classification?
[A] Carolus Linnaeus
[B] Ernest Haeckel
[C] Copeland
[D] RH Whittaker
Show Answer
Correct Answer: A [Carolus Linnaeus]
Notes:
Carolus Linnaeus proposed Two kingdom of classification in which he classified organisms into Plantae and Animalia.
17. Who among the following discovered the cytoplasm?
[A] Rudolf von Kölliker
[B] Camillo Golgi
[C] Christian de Duve
[D] Walther Flemming
Show Answer
Correct Answer: A [Rudolf von Kölliker]
Notes:
The term was introduced by Rudolf von Kölliker in 1863. It was originally synonymous with protoplasm, but later changed to mean cell matter and organelles outside the nucleus.
18. Which Viruses are Relatively Thermostable?
[A] Human immunodeficiency virus
[B] Rubella virus
[C] Hepatits A virus
[D] Influenza virus
Show Answer
Correct Answer: C [Hepatits A virus]
Notes:
Hepatitis A virus are Relatively Thermostable. A highly contagious liver infection caused by the hepatitis A virus.
19. Which is not an exception in angiosperms?
[A] Double fertilization
[B] Secondary growth
[C] Presence of vessels
[D] Autotrophic nutrition
Show Answer
Correct Answer: A [Double fertilization]
Notes:
Angiosperms are plants that produce flowers. They hold their seeds in the fruits. They are the largest and most diverse group within the Plantae kingdom, with approximately 300,000 species. Double fertilization is a characteristic of angiosperms in which both a diploid zygote and a triploid endosperm are formed in this process of green fertilization.
20. Bryophytes are dependent on water because__?
[A] Archegonium has to remain filled with water for fertilization
[B] Water is essential for fertilization for their homosporous nature
[C] Water is essential for their vegetative propagation
[D] The sperms can easily reach up to egg in the archegonium
Show Answer
Correct Answer: D [The sperms can easily reach up to egg in the archegonium]
Notes:
Bryophytes are dependent on water because the sperms can easily reach up to eggs in the archegonium.
