Biology (Part-III) (Railway)

Total Questions: 50

11. Which kind of respiration release more energy to the oгganism? [RRB RPF Constable Exam, 02.02.2019 Shift-I]

(1) Aerobic Respiration
(2) Homogenic Respiration
(3) Anaerobic Respiration
(4) Heterogenic Respiration

Correct Answer: (1) Aerobic Respiration

Solution:Aerobic respiration is much more efficient and produces ATP more quickly than anaerobic respiration.

• This is because oxygen is an excellent electron acceptor for the chemical reactions involved in generating ATP.

12. The female reproductive organ of flower is___________. [RRB RPF Constable Exam, 11.02.2019 Shift-I]

(1) Androecium
(2) Gynoecium
(3) Carolla
(4) Calyx

Correct Answer: (2) Gynoecium

Solution:Genesium or Staymen is most commonly used as a collective term for the parts of a flower that produce ovules and ultimately develop into the fruit and seeds.

• The pistil includes an ovary (where the ovules are produced; ovules are the female reproductive cells, the eggs), and a stigma (which receives the pollen during fertilization).

13. The cranial nerves originate from which part of human body? [RRB RPF Constable Exam, 11.02.2019 Shift-I]

(1) Spinal cord
(2) Muscle
(3) Heart
(4) Brain

Correct Answer: (4) Brain

Solution:All cranial nerves originate from nuclei in the brain.

• Two originate from the forebrain (Olfactory and Optic). one has a nucleus in the spinal cord while the remainder originate from the brainstem.

14. Which of the following parts of plant regulates opening and closing of stomata? [RRB RPF Constable Exam, 11.02.2019 Shift-I]

(1) Stigma
(2) Guard cells
(3) Leaves
(4) Stomata

Correct Answer: (2) Guard cells

Solution:Stomata are surrounded by two guard cells which regulate its opening and closing.

• Stomata open during the day time for gaseous exchange and also release water vapour through transpiration.

• The opening and closing of stomata is due to the change in turgor pressure of the guard cell.

15. Which of the following is an example of dichromatism? [RRB RPF Constable Exam. 11.02.2019 Shift-I]

(1) Toluene
(2) Polaroid
(3) Tourmaline
(4) Lens

Correct Answer: (3) Tourmaline

Solution:Dichromatism means that something has been divided into two parts.

• Dichromatism branching is common in ferns and mosses.

16. By which of the following biological processes, harmful metabolic wastes are removed from the body? [RRB RPF Constable Exam, 15.02.2019 Shift-I]

(1) Anarobic Respiration
(2) Sweating
(3) Aerobic Respiration
(4) Emissions

Correct Answer: (4) Emissions

Solution:Excretion is the physiological process of elimination of metabolic wastes from the body.

• The excretory products include amino acids, urea, uric acid, carbon dioxide, water, and ammonia.

• Kidneys are the primary excretory organs in humans.

17. Which of the following is an example of taproot? [RRB RPF Constable Exam. 15.02.2019 Shift-I]

(1) Pea plants
(2) Papaya
(3) Cactus
(4) Mimosa plant

Correct Answer: (1) Pea plants

Solution:Maize is not a taproot plant.

• The papaya tree has the tap root system.

• Some cacti have taproots.

• Chhui-mui plant is a taproot.

18. What is the reason for the rapid growth of cells in the part of stem away from light? [RRB RPF Constable Exam, 15.02.2019 Shift-I]

(1) Auxin
(2) Electric Impulse
(3) Abscissic acid
(4) Cytokinin

Correct Answer: (1) Auxin

Solution:Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant.

• This produces a curving of the plant stem tip toward the light, a plant movement known as phototropism.

19. Which indicator is used to estimate the number of people who died prematurely due to a particular disease, as well as some years spent in the condition of disability due to illness? [RRB RPF Constable Exam, 15.02.2019 Shift-I]

(1) Global Weight of Illness (GBD)
(2) Global Health Indicator
(3) Human Development Index
(4) World Health Index

Correct Answer: (1) Global Weight of Illness (GBD)

Solution:The Global Burden of Disease Study is a comprehensive regional and global assessment of mortality and disability from major diseases, injuries, and risk factors.

• The study was initiated in the 1990s as a collaborative effort of hundreds of experts world-wide, including researchers at the World Health Organization (WHO), and the World Bank.

20. Within which pH range human body functions? [RRB RPF Constable Exam, 18.02.2019 Shift-II]

(1) 7.2 to 8.1
(2) 7.0 to 7.8
(3) 6.9 to 7.2
(4) 7.0 to 9.0

Correct Answer: (2) 7.0 to 7.8

Solution:The pH scale ranges from 0 (strongly acidic) to 14 (strongly basic or alkaline).

• A pH of 7.0, in the middle of this scale, is neutral.

• Human body works within the pH range of 7-7.8.

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