11. Who was awarded Nobel Prize for deciphering the language of bees? (UPSC Prelims 1995)
[A] H.G. Khurana
[B] K.V. Frisch
[C] Julian Huxley
[D] Dorothy Hodgkins
Show Answer
Correct Answer: B [K.V. Frisch]
Notes:
K.V. Frisch shared the 1973 Nobel Prize in physiology or medicine with K. Lorenz and N. Tinbergen for his pioneering work in ethology. He deciphered the ‘language’ of bees by studying their dance patterns in which one bee tells others in the hive the direction and distance of a food source.
12. Which of the following defines the process of Metastasis? (UPSC Prelims 2001)
[A] cells divide rapidly under the influence of drugs
[B] cancer cells spread through the blood or laymphatic system to other sites or organs
[C] the chromosomes in cell nuclei are attached to the spindle before moving to the anaphase poles
[D] cancer cells are successfully inhibited to divide any further
Show Answer
Correct Answer: B [cancer cells spread through the blood or laymphatic system to other sites or organs]
Notes:
Metastasis is a complex process that involves the spread of a tumor or cancer to distant parts of the body from its original site. The cancerous cells are sloughed from the tumours and reach distant sites through blood, and whenever they get lodged in the body, they start a new tumour there. This property called metastasis is the most feared property of malignant tumours.
13. Ticks and mites belongs to which of the following classes? (UPSC Prelims 2002)
[A] Arachnids
[B] Crustaceans
[C] Insects
[D] Myriapods
Show Answer
Correct Answer: A [Arachnids]
Notes:
The order Acarina (class Arachnida) includes mites and ticks. Members of this order differ from other arachnids in that the body is not segmented, and the cephalothorax and abdomen are combined into one body region. Larval mites and ticks have three pairs of legs, whereas nymphs and adults have four pairs.
14. Which part of the human body is affected by Alziemer’s disease?
[A] Brain
[B] Lungs
[C] Heart
[D] Kidneys
Show Answer
Correct Answer: A [Brain]
Notes:
Alziemer’s is a disease which attacks the neural system, It results in continuous decline in the number brain cells which leads to loss of memory.
15. rRNA is synthesized by which of the following?
[A] Nucleus
[B] Nucleolus
[C] Golgi body
[D] Cytoplasm
Show Answer
Correct Answer: B [Nucleolus]
Notes:
Molecules of rRNA are synthesized by the nucleolus in a specialized region of the cell nucleus, which appears as a dense region within the nucleus and contains genes encoding rRNA.
16. Which one of the following is an example of a phospholipid?
[A] Steroid
[B] Cholesterol
[C] Lecithin
[D] Sterol
Show Answer
Correct Answer: C [Lecithin]
Notes:
Lecithin is a mixture of brown and yellow colored phospholipids that contain glycerol. It also acts as an emulsifier in many types of food.
17. Which of the following virus has its envelope from the host cell nucleus?
[A] Paramyxoviruses
[B] Retroviruses
[C] Orthomyxoviruses
[D] Herpesviruses
Show Answer
Correct Answer: D [Herpesviruses]
Notes:
The Herpesviridae are a large family of DNA viruses. It causes infections and some diseases in animals, including humans. Herpes viruses are divided into three groups: α herpesviruses, herpes simplex virus types 1 and 2.
18. Which of the following are the most primitive vascular plants?
[A] Mosses
[B] Cycads
[C] Kelps
[D] Ferns
Show Answer
Correct Answer: D [Ferns]
Notes:
A fern is a member of a group of vascular plants. It reproduces by means of spores and has neither seeds nor flowers.
19. Which gas is taken in by plants in the process of photosynthesis?
[A] Oxygen
[B] Carbon dioxide
[C] Nitrogen
[D] Argon
Show Answer
Correct Answer: B [Carbon dioxide]
Notes:
During photosynthesis, plants take in carbon dioxide, water, and sunlight and release oxygen. Photosynthesis occurs in Chloroplasts in presence of chlorophyll pigment.
20. Carbon Dioxide from the air is trapped by which of the following parts of the plant?
[A] Petals
[B] Root hairs
[C] Stomata
[D] Mitochondria
Show Answer
Correct Answer: C [Stomata]
Notes:
Carbon dioxide in the air is trapped by stomata. It captures Carbon dioxide from the surface of the leaves and CO2 enters through the tiny pores present on leaves called stomata.
