11. Heart has four chambers, left & right ventricles and left & right atria which are synchronized to act together. A condition in which synchronism does not take place is known as ____?
[A] Fasciculation
[B] Fibrillation
[C] Myokymia
[D] Cramp
Show Answer
Correct Answer: B [Fibrillation]
Notes:
Heart has four chambers, left & right ventricles and left & right atria which are synchronized to act together. A condition in which synchronizm does not take place is know as fibrillation. Fibrillation of atrial muscles is called as atrial fibrillation, fibrillation of the ventricular muscles is termed as ventricular fibrillation. In atrial fibrillation the ventricles functions normally, but respond with an irregular rhythm. In atrial fibrillations circulation is maintained, although not as efficiently. Ventricular fibrillation is more dangerous, as the ventricle are unable to pump the blood. There are many methods of correcting fibrillation mechanically, includingA.C. defibrillation & D.C. defibrillation. (Source: The Hindu Speaks on Science). Kindly read about working of Human Heart, particularly, how blood passes in 4 different parts of Human heart.
12. The Study of Bryophytes & pteridophytes is known by Which terms?
[A] Cytology
[B] Bryology
[C] Mycology
[D] Pomology
Show Answer
Correct Answer: B [Bryology]
Notes:
Bryology is the branch of botany that deals with the scientific study of bryophytes such as mosses, liverworts, and hornworts.
13. The name of Theodor Schwann is associated with the discovery of which of the following?
[A] enzyme pepsin
[B] glial cells in nerves
[C] microorganisms play in alcohol fermentation
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Schwann discovered the enzyme pepsin and discovered glial cells in nerves – these are now known as Schwann cells. He also identified the role of microorganisms in alcohol fermentation.
14. Which of the following was defined by Gerardus Johannes Mulder?
[A] Vitamins
[B] Protiens
[C] Fats
[D] None of these
Show Answer
Correct Answer: B [Protiens]
Notes:
The protein was first described by Dutch chemist Gerardus Johannes Mulder and named by Swedish chemist Jöns Jacob Berzelius in 1838.
15. Gonyaulax, which are known for causing red tides, belong to which of the following?
[A] Algae
[B] Fungi
[C] Protista
[D] Bacteria
Show Answer
Correct Answer: C [Protista ]
Notes:
Red tides are caused by Gonyaulax which are small, microscopic organisms that grow in water and also called dinoflagellates.
16. Virus size is usually measured by__?
[A] centimeters
[B] micrometers
[C] nanometers
[D] millimeters
Show Answer
Correct Answer: C [nanometers]
Notes:
Virus size is usually measured by nanometers. Most viruses vary in diameter from 20 nanometers (nm; 0.0000008 in) to 250–400 nm. The largest viruses have a diameter of about 500 nm and a length of about 700–1,000 nm.
17. What is the fusion of mature individuals that directly act as gametes called?
[A] Isogamy
[B] Anisogamy
[C] Hologamy
[D] Autogamy
Show Answer
Correct Answer: C [Hologamy]
Notes:
In Chlamydomonas, two mature individuals participate in sexual reproduction called hologamy.
18. Which of the following includes ‘club fungus’ in this fungal division?
[A] Zygomycota
[B] Deuteromycota
[C] Basidiomycota
[D] Ascomycota
Show Answer
Correct Answer: C [Basidiomycota]
Notes:
Basidiomycota is one of the two larger divisions. Together with the Ascomycota, they constitute the subfamily Dicarya within the kingdom Fungi.
19. Fruits are not found in gymnosperm plants because__?
[A] They are seedless plants
[B] They are not pollinated
[C] They have no ovary
[D] Process of fertilization does not take place in them
Show Answer
Correct Answer: C [They have no ovary]
Notes:
Fruits are not found in gymnosperm plants because they have no ovaries. Gymnosperms belong to the Kingdom Plantae and the sub-kingdom Embryophyta.
20. In anaerobic respiration, glucose is broken down into what?
[A] ethyl alcohol
[B] carbon dioxide
[C] energy
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Glucose breaks down into ethyl alcohol, carbon dioxide, and energy.
Glucose → Alcohol + Carbon dioxide + Energy
