11. With reference to the blood in a normal person, which one of the following statements is correct? (UPSC Prelims 2002)
[A] Compared to arteries, veins are less numerous and hold less of the body’s blood at any given time
[B] Blood cells constitute about 70 per cent of the total volume of the blood
[C] White Blood Cells (WBC) are made by lymph nodes only
[D] The blood has more platelets than WBC
Show Answer
Correct Answer: D [The blood has more platelets than WBC]
Notes:
Blood has more platelets than corpuscles. A microlitre of blood contains 5,000-10,000 of White blood cells (WBC) and 150,000-500,000 platelets.
12. Which device is used to measure the growth in plants?
[A] Anemograph
[B] Seismograph
[C] Crescograph
[D] All the above
Show Answer
Correct Answer: C [Crescograph]
Notes:
Crescograph is a device which is used to measure the growth in plants which was developed by Sir Jagadish Chandra Bose in the first half of 20th century.
13. How many chromosomes are present in human beings?
[A] 44
[B] 46
[C] 48
[D] 42
Show Answer
Correct Answer: B [46]
Notes:
Human beings have 46 chromosomes in their cells. 22 pairs of autosomes and 2 special chromosomes called sex chromosomes are present.
14. Which of the following was invented by Jonas Salk?
[A] Polio Drop
[B] Polio Vaccine
[C] BCG Vaccine
[D] aspirin
Show Answer
Correct Answer: B [Polio Vaccine]
Notes:
The first effective polio vaccine was developed in 1952 by Jonas Salk. Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus.
15. What is a jelly-like substance found floating inside the plasma membrane called?
[A] Cell sap
[B] Cytoplasm
[C] Karyoplasm
[D] Mitochondria
Show Answer
Correct Answer: B [Cytoplasm]
Notes:
The jelly-like substance inside the plasma membrane in which all the organelles float is called cytoplasm.
16. Who among the following discovered the plasma membrane?
[A] Robert Hooke
[B] Albert von Kolliker
[C] George E. Palade
[D] Rudolf von Kölliker
Show Answer
Correct Answer: A [Robert Hooke]
Notes:
The plasma membrane is mainly composed of fatty-acid-based lipids and proteins. Robert Hooke discovered the plasma membrane.
17. Which of the following is not a cause of Food Poisoning?
[A] Salmonella
[B] Campylobacter
[C] E. coli & Shigella
[D] Yersinia pestis
Show Answer
Correct Answer: D [Yersinia pestis]
Notes:
Plague is a disease that affects humans and other mammals and is caused by the bacterium Yersinia pestis.
18. In ferns, the leaves during young conditions are called__?
[A] Scale leaf
[B] Sporophyll
[C] Circinate Ptyxis
[D] None of these
Show Answer
Correct Answer: C [Circinate Ptyxis ]
Notes:
In ferns, the leaves during young conditions are called Circinate Ptyxis.
19. Most of the gymnosperms have__?
[A] Only antheridia
[B] Both antheridia and archegonia
[C] Archegonia but no antheridia
[D] Both absent
Show Answer
Correct Answer: C [Archegonia but no antheridia]
Notes:
Archegonia is found in bryophytes, pteridophytes and gymnosperms. It occurs in antheridia bryophytes and pteridophytes.
20. Which tissue contains various glands, which secrete oils, resins, tannins, mucilage, etc. to the plant?
[A] Laticiferous
[B] Euphorbiaceae
[C] Glandular
[D] All of the above
Show Answer
Correct Answer: C [Glandular]
Notes:
Glandular tissue contains various glands, which secrete oils, resins, tannins, mucilage, etc. to the plant.
