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Biology (Part-II) (Railway)

📆 April 30, 2025

Total Questions: 50

31. Cogulation or Coglum (red brown waste) is deposited at the place of cut after some time. It is a net of.... fibres. [RRB RPF/RPSF SI Exam, 11.01.2019 Shift-II]

Correct Answer: (4) Platelets
Solution:Blood clotting (technically "blood coagulation") is the process by which (liquid) blood is transformed into a solid state. Blood platelets congregate at the site of damage and amass to form a platelet plug. This is the beginning of the process of the blood "breaking down" from its usual liquid form in such a way that its constituents play their own parts in processes to minimize blood loss.

32. The tissue found between the upper and lower apidermis of the leaf of a unicot is called [RRB RPF/RPSF SI Exam, 11.01.2019 Shift-II]

Correct Answer: (2) Mesophyl
Solution:The mesophyll is located between the upper and lower layers of the leaf epidermis, and is mostly made up of parenchyma (ground tissue) or chlorenchyma tissue. The mesophyll is the primary location for photosynthesis and is divided into two layers. the upper palisade layer and the spongy mesophyll layer.

33. The system of ovums within ovary of the plants is called [RRB RPF/RPSF SI Exam, 11.01.2019 Shift-II]

Correct Answer: (2) embryo sac
Solution:The ovule in plants is a structure that encloses the reproductive cells in females which contains - the nucleus, the integument and the female gametophyte. The embryo sac or female gametophyte is an oval structure present in the ovule of flowering plants.

34. Which protein is secreted by Infected host cells for the protection of any non-infected infected host cell [RRB RPF/RPSF SI Exam, 11.01.2019 Shift-III)]

Correct Answer: (3) Interferons
Solution:Interferons are small, natural or synthetic protein and glycoprotein cytokines that are produced by leucocytes, T-lymphocytes, and fibroblasts in response to infection and other biological-stimuli. Interferons stimulate the production of antiviral proteins in the cells which inhibit the synthesis of viral RNA and proteins. Interferons also regulate the growth, differentiation and functions of different types of immune cells in animals.

35. Which of the following is not related to medicinal group out of the following option [RRB RPF/RPSF SI Exam, 11.01.2019 Shift-III]

Correct Answer: (4) Skeet
Solution:Stimulants are drugs that 'stimulate' the central nervous system. It includes sedativés, narcotics and cannabis. Skeet shooting is a recreational and competitive activity where participants, using shotguns, attempt to break clay targets mechanically flung into the air from two fixed stations at high speed from a variety of angles. Skeet is one of the three major disciplines of competitive clay pigeon shooting.

36. Which of the following organ of body protects blood plasma to became more basic or acidic by regulating ions? [RRB RPF/RPSF SI Exam, 11.01.2019 Shift-IIII]

Correct Answer: (2) Kidney
Solution:The kidneys of vertebrates have the vital function of removing metabolic wastes from the blood and otherwise maintaining its normal composition. The kidneys help maintain homeostasis in the body by regulating water balance. ion balance, and acid-base levels in fluids. The kidneys also secrete hormones that are necessary for normal function.

37. By whom are the cuts made at particular places in DNA? [RRB RPF/RPSF SI Exam, 12.01.2019 Shift-II]

Correct Answer: (1) Endonucleus
Solution:Restriction enzyme, also called restriction endonuclease is a protein produced by bacteria that cleaves DNA at specific sites along the molecule. In the bacterial cell. restriction enzymes cleave foreign DNA, thus eliminating infecting organisms.

38. Inflammation in the joints caused by the deposition of solid particles of uric acid is called........ [RRB RPF/RPSF SI Exam, 12.01.2019 Shift-II]

Correct Answer: (1) Gout
Solution:Gout is a form of inflammatory arthritis that develops in some people who have high levels of uric acid in the blood. The acid can form needle-like crystals in a joint and cause sudden, severe episodes of pain, tenderness, redness, warmth and swelling.

39. Which of the following is commonly called red algae? [RRB RPF/RPSF SI Exam, 12.01.2019 Shift-III]

Correct Answer: (2) Rhodophyceae
Solution:Red algae, or Rhodophyta are one of the oldest groups of eukaryotic algae. The red algae form a distinct group characterized by having eukaryotic cells without flagella and centrioles, chloroplasts that lack external endoplasmic reticulum and contain unstacked (stroma) thylakoids, and use phycobiliproteins as accessory pigments, which give them their red color.

40. In which of the following continents is the Atlas Mountains located? [RRB RPF/RPSF SI Exam, 12.01.2019 Shift-III]

Correct Answer: (4) Africa
Solution:The Atlas Mountains are a mountain range in the Maghreb. It stretches around 2.500 km (1,600 mi) through Morocco, Algeria and Tunisia. The range's highest peak is Toubkal, with an elevation of 4,167 metres (13,671 ft) in southwestern Morocco.
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