Biology (Part-II) (Railway)

Total Questions: 50

41. Which of the following is the female reproductive organ of flowers? [RRB RPF/RPSF SI Exam, 12.01.2019 Shift-III]

(1) monoesium
(2) gesium
(3) zygote
(4) stamens

Correct Answer: (3) zygote

Solution:The male parts of the flower are called the stamens and are made up of the anther at the top and the stalk or filament that supports the anther. The female elements are collectively called the pistil.

42. Which type of vein structure is generally found in the leaves of dicot plants? [RRB RPF/RPSF SI Exam, 13.01.2019 Shift-II]

(1) Peeled vein formation
(2) Petiole vein formation
(3) Plexus vein formation
(4) Parallel vein formation

Correct Answer: (3) Plexus vein formation

Solution:Dicots are plants that have seeds with two cotyledons and so are termed as dicotyledonous plants. Examples: Sunflower, Mango. They have reticulate or net venation. Leaf veins are arranged either in parallel through the length of the leaf or in a reticulate arrangement throughout the leaf.

43. ..... Nutrition is defined as the 'synthesis of organic molecules by taking simple inorganic substances. [RRB RPF/RPSF SI Exam, 13.01.2019 Shift-II]

(1) Autotrophs
(2) Aerobic nutrition
(3) Anaerobic Nutrition
(4) Parasite

Correct Answer: (1) Autotrophs

Solution:Autotrophic nutrition is a process where the organism prepares its food from the simple inorganic materials like water, mineral salts and carbon dioxide in the presence of sunlight. All the green plants possess an autotrophic mode of nutrition. Plants like blue-green algae and cyanob acteria could be considered as the example of autotrophic nutrition.

44. If the kidney is not functioning properly, then an excess amount of urea accumulates in it, this condition is called- [RRB RPF/RPSF SI Exam, 16.01.2019 Shift-II]

(1) Nephropathy
(2) Kidney failure
(3) Kidney stones
(4) Uremia

Correct Answer: (4) Uremia

Solution:Uremia is a clinical syndrome marked by elevated concentrations of urea in the blood and associated with fluid, electrolyte, and hormone imbalances and metabolic abnormalities, which develop in parallel with deterioration of renal function. Uremia more commonly develops with chronic kidney disease (CKD).

45. The process of converting a precipitate into a colloidal solution by shaking it in the presence of a small amount of electrolyte in a rare medium is called? [RRB RPF/RPSF SI Exam, 16.01.2019 Shift-II]

(1) dialysis
(2) purification
(3) coagulation
(4) peptization

Correct Answer: (4) peptization

Solution:Peptization is the process of forming stable colloids by using an electrolyte to break up a precipitate and disperse it into the colloid. So while coagulation uses charges to disrupt the colloid and form an aggregate, peptization uses charges to form a colloid from a precipitate. The electrolyte used for this purpose is called peptizing agent.

46. The process of transpiration in leaves is mainly done by .......... [RRB RPF/RPSF SI Exam, 16.01.2019 Shift-II]

(1) stomata
(2) detritus
(3) Microfibrils
(4) Plasmodium

Correct Answer: (1) stomata

Solution:Stomata are tiny openings or pores in plant tissue that allow for gas exchange. Stoma taare typically found in plant leaves but can also be found in some stems. They also help to reduce water loss by closing when conditions are hot or dry. Stomata look like tiny mouths which open and close as they assist in transpiration.

47. Tuberculosis (TB) disease is caused by____________. [RRB RPF Constable Exam, 17.01.2019 Shift-III]

(1) Protozoa
(2) Fungus
(3) Virus
(4) Bacterial

Correct Answer: (4) Bacterial

Solution:Tuberculosis (TB) is a disease caused by bacteria Mycobacterium tuberculosis.

• The bacteria usually attack the lungs, but TB bacteria can attack any part of the body such as the kidney, spine, and brain.

48. Which of the following is an air borne disease? [RRB RPF Constable Exam, 17.01.2019 Shift-III]

(1) Cholera
(2) Rubela
(3) Small Pox
(4) Covid-19

Correct Answer: (4) Covid-19

Solution:A bacterial disease causing severe diarrhoea and dehydration, usually spread in water.

• Rubella, measles and small-pox are viral diseases.

• Covid-19 is an infectious disease spread through the air.

49. In a cell division, a parent cell divides into ___________ daughter cells. [RRB RPF Constable Exam, 17.01.2019 Shift-III]

(1) An uneven
(2) Two uneven
(3) Two similar
(4) Similar

Correct Answer: (3) Two similar

Solution:The cell cycle is a repeating series of events that include growth. DNA synthesis, and cell division.

• Cell division is process in which a parent cell divides to form two daughter cells is the process in which one cell. called the parent cell, divides to form two new cells, referred to as daughter cells.

50. Which sex genes are present in males? [RRB RPF Constable Exam, 17.01.2019 Shift-III]

(1) XX
(2) YY
(3) XY
(4) None of the above

Correct Answer: (3) XY

Solution:humans and most other mammals have two sex chromosomes, the X and the Y.

• Females have two X chromosomes in their cells, while males have both X and a Y chromosomes in their cells.

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