1. 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.
2. Which among the following is correct about Saliva of a Healthy Human?
[A] It is slightly acidic
[B] It is slightly saline
[C] It is slightly alkaline
[D] It is neutral
Show Answer
Correct Answer: C [It is slightly alkaline]
Notes:
pH stands for potential hydrogen. It is used to describe the chemical acidity level vs. alkalinity level of a substance. The pH of Healthy human saliva is slightly alkaline and in the range of 6.2 to 7.6.
3. The “Red Tides” which are found in marine coastal areas such as “Florida red tide” that occurs in the Gulf of Mexico, is considered to be responsible for bioaccumulation and making local filter feeding organisms such as mussels and oysters toxic. Due to which of the following the “Red Tides” Occur?
[A] Bacteria
[B] Algae
[C] Fungi
[D] Toxic Wastes of the Industries
Show Answer
Correct Answer: B [Algae]
Notes:
Red tide is a common name for algal blooms. It is the large concentrations of aquatic microorganisms, such as protozoans and unicellular algae (e.g. dinoflagellates and diatoms). The upwelling of nutrients from the sea floor following massive storms, provides for the algae and triggers bloom events.
4. The Bovine spongiform encephalopathy (BSE) is commonly known as _______?
[A] Foot & Mouth Disease
[B] Mad Cow Disease
[C] Fog fever
[D] Creutzfeldt-Jakob disease
Show Answer
Correct Answer: B [Mad Cow Disease]
Notes:
The Bovine spongiform encephalopathy (BSE) is commonly known as Mad Cow Disease. It is a brain disorder in an adult cattle that may be spread to humans through diseased meat.
5. Which of the following crops has the highest photosynthetic activity?
[A] Cotton
[B] Sugarcane
[C] Rice
[D] Wheat
Show Answer
Correct Answer: B [Sugarcane]
Notes:
Among the above all, the sugarcane has the highest photosynthetic activity. Photosynthesis is a chemical process that occurs in many forms of bacteria and virtually all plants, including aquatic plants and algae. The rate of photosynthesis in a plant is dependent on the environmental changes, as well as to intrinsic features of plant. The photosynthetic rate in sugarcane is directly related with the variation of solar radiation during the day.
6. Which is not a parasite? (UPSC Prelims 1984)
[A] Tick
[B] Housefly
[C] Bed bug
[D] Louse
Show Answer
Correct Answer: B [Housefly]
Notes:
Tick, beg bug and louse are parasitic insects that live on the skin of mammals or birds.
Housefly is not a parasite.
7. In which of the following diseases Sex chromosomes transmit? (UPSC Prelims 1985)
[A] Myopia
[B] Colour blindness
[C] Longsightedness
[D] Night blindness
Show Answer
Correct Answer: B [Colour blindness]
Notes:
It is sex-linked that genetic red-green color blindness affects males much more often than females, because the genes for the red and green color receptors are located on the X chromosome, of which males have only one and females have two.
8. Which of the following is the quality of the pitch of the voice of women? (UPSC Prelims 1994)
[A] marginally lower than that of men
[B] higher than that of men
[C] much lower than that of men
[D] the same as that of men
Show Answer
Correct Answer: B [higher than that of men]
Notes:
The larger the larynx, the longer and thicker the vocal folds and the lower the pitch of the voice. Typical male voices range in pitch from 85 hertz to 180 hertz. Typical female voices range from 165 hertz to 255 hertz.
9. Which one of the following types of micro-organisms is most widely used in industries? (UPSC Prelims 1998)
[A] Bacteria
[B] Bacteria and fungi
[C] Bacteria and algae
[D] Bacteria, micro-algae and fungi
Show Answer
Correct Answer: D [Bacteria, micro-algae and fungi]
Notes:
Bacteria, micro-algae and fungi are most widely used in industries
10. Phototropism Theory is related to which of the following scientist?
[A] Jane Goodall
[B] Charles Darwin
[C] Francis Galton
[D] None of these
Show Answer
Correct Answer: B [Charles Darwin]
Notes:
Plant physiologists have investigated phototropism for over 100 years. The best known early research on phototropism was by Charles Darwin.
