1. A ripe Tomato is Red, Leaves are Green, Flower is Purple, Hair is Black. Bring out the pigments responsible for these colors respectively ?
[A] Lycopene, Melanin, Chlorophyll, Anthocyanin
[B] Lycopene, Chlorophyll, Anthocyanin, Melanin
[C] Anthocyanin, Chlorophyll, Lycopene, Melanin
[D] Melanin, Anthocyanin, Chlorophyll, Lycopene
Show Answer
Correct Answer: B [Lycopene, Chlorophyll, Anthocyanin, Melanin]
Notes:
A ripe Tomato is Red, Leaves are Green, Flower is Purple, Hair is Black. The pigments responsible for these colors are Lycopene, Chlorophyll, Anthocyanin, Melanin respectively.
2. Which among the following correctly refers to Ischemia?
[A] restriction in blood supply due to factors in the blood vessels
[B] Abrupt fall in the blood Pressure
[C] necrosis in a blood vessel due to a local lack of oxygen
[D] condition of severely deficient supply of oxygen to the body
Show Answer
Correct Answer: A [restriction in blood supply due to factors in the blood vessels]
Notes:
Restriction in blood supply due to factors in the blood vessels refers to Ischemia. Ischemia can have causes that aren’t due to underlying disease some of which include extreme exercise, cold exposure or tourniquet.
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 ancestors of land plants were most likely similar to modern__:
[A] Conifers
[B] Ferns
[C] Green Algae
[D] Flowering Plants
Show Answer
Correct Answer: C [ Green Algae]
Notes:
The ancestor of the modern multicellular plant is the green algae, Chlorophyta.
5. 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.
6. Which of the following correctly defines an Antigen? (UPSC Prelims 2002)
[A] Lowers body temperature
[B] destroys harmful bacteria
[C] triggers the immune system
[D] is used as an antidote to poison
Show Answer
Correct Answer: C [triggers the immune system]
Notes:
An antigen is any substance that causes your immune system to produce antibodies against it. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen. An antigen may also form inside the body.
7. Which of the following branch of biology deals with the study of behavioral aspects of animals?
[A] Myrmecology
[B] Palaeozoology
[C] Psychobiology
[D] Parazoology
Show Answer
Correct Answer: C [Psychobiology]
Notes:
Psychobiology is branch of biology which deals with the study of behavioral aspects of animals.
8. Green Algae are known as__?
[A] Rhodophyceae
[B] Chlorophyceae
[C] Phaeophyceae
[D] Green tide
Show Answer
Correct Answer: B [Chlorophyceae]
Notes:
Algae is a Thalloid plant and autotrophic in nature. Mostly algae is aquatic and contains chlorophyll. Green algae is also known as Chlorophyceae.
9. What is the process in which material is ingested by the cells through the plasma membrane?
[A] Egestion
[B] Diffusion
[C] Osmosis
[D] Endocytosis
Show Answer
Correct Answer: D [Endocytosis]
Notes:
Endocytosis is the process in which the ingestion of material by the cells is carried out through the plasma membrane.
10. Who discovered nucleus of cell wall?
[A] Theodor Boveri
[B] Robert Brown
[C] Albert von Kolliker
[D] Robert Hooke
Show Answer
Correct Answer: B [Robert Brown]
Notes:
Robert Brown discovered the nucleus in the cell in 1831. The nucleus is a protoplasmic body in eukaryotic cells. It is covered by a double membrane that contains the hereditary details.
