Biology (Part-II) (Railway)

Total Questions: 50

21. In which of the following animals the body is made of two layers of cells? [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-I]

(1) Hydra
(2) Tapeworm
(3) Planaria
(4) Liver flukes

Correct Answer: (1) Hydra

Solution:Hydra has two main body layers, which makes it 'diploblastic'. The layers are separated by mesoglea, a gel-like substance. The outer layer is the epidermis, and the inner layer is called the gastrodermis, because it lines the stomach. The cells making up these two body layers are relatively simple.

22. Natural gas is formed under the earth by the decomposition of vegetable matter decaying under water. This decomposition is carried out by: [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-III]

(1) Anaerobic bacteria
(2) Industrial fuel
(3) Calorifil
(4) Alcohol (ethanol)

Correct Answer: (1) Anaerobic bacteria

Solution:Natural gas is formed when layers of decomposing plant and animal matter are exposed to intense heat and pressure under the surface of the Earth over millions of years. The decomposition is caused by anaerobic bacteria. Natural gas is found in deep underground rock formations or associated with other hydrocarbon reservoirs in coal beds and as methane clathrates.

23. The process of copying the genetic information on the RNA from one of the DNA is called___________. [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-II]

(1) Transcription
(2) Transcoping
(3) Transformation
(4) Translation

Correct Answer: (1) Transcription

Solution:Transcription is the process in which a gene's DNA sequence is copied (transcribed) to make an RNA molecule. RNA polymerase is the main transcription enzyme. Transcription begins when RNA polymerase binds to a promoter sequence near the beginning of a gene (directly or through helper proteins). RNA polymerase uses one of the DNA strands (the template strand) as a template to make a new, complementary RNA molecule. Transcription ends in a process called termination. Termination depends on sequences in the RNA, which signal that the transcript is finished.

24. What is the name of the disorder caused by the presence of an extra chromosome 21? [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-II]

(1) Klinefelters syndrome
(2) Downs Syndrome
(3) Darwin's syndrome
(4) Turners Syndrome

Correct Answer: (2) Downs Syndrome

Solution:Down syndrome is a genetic disorder caused when abnormal cell division results in an extra full or partial copy of chromosome 21. This extra genetic material causes the developmental changes and physical features of Down syndrome.

25. What is the process of transfer of pollen grains in the of flower is called feminine intersections? [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-II]

(1) Pollination
(2) Bilateral
(3) Embryogeny
(4) Function

Correct Answer: (1) Pollination

Solution:The transfer of pollen grains from the anther to the female part (stigma) in plants is called pollination. After pollination, fertilization takes place and reproduction progresses.

26. Which is only available in flower? [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-III]

(1) The cell structure
(2) Nucleous
(3) The cell wall
(4) The cell memberane

Correct Answer: (4) The cell memberane

Solution:A cell wall is a rigid, semipermeable protective layer in some cell types. This outer covering is positioned next to the cell membrane (plasma membrane) in most plant cells, fungi, bacteria, algae, and some archaea. Animal cells however, do not have a cell wall. The cell wall has many important functions in a cell including protection, structure, and support.

27. What is purpose of "kyoto protocol"? [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-III]

(1) To protect the land
(2) To reduce the green houses Gases
(3) To reduce the Pollution in Aero Provide Permanent facility space
(4) Electronic magnet pressure reduce

Correct Answer: (2) To reduce the green houses Gases

Solution:The Kyoto Protocol is an international treaty which extends the 1992 United Nations Framework Convention on Climate Change (UNFCCC) that commits state parties to reduce greenhouse gas emissions. The Kyoto Protocol was adopted in Kyoto, Japan, on 11 December 1997 and entered Into force on 16 February 2005. The detailed rules for the implementation of the Protocol were adopted at COP 7 in Marrakesh, Morocco, In 2001, and are referred to as the "Marrakesh Accords."

28. By which type of breeding high level of vitamin, protein or other fat crops are responsible? [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-III]

(1) Tissue culture
(2) Inbreding
(3) Biofortification
(4) Inter-specific Hybridization

Correct Answer: (3) Biofortification

Solution:Fortification is the practice of deliberately increasing the content of an essential micronutrient, i.e. vitamins and minerals (including trace elements) in a food, so as to improve the nutritional quality of the food supply and provide a public health benefit with minimal risk to health. Biofortification is the process by which the nutritional quality of food crops is improved through agronomic practices, conventional plant breeding, or modern biotechnology.

29. What is secreted from Pineal Gland? [RRB RPF/RPSF SI Exam, 10.01.2019 Shift-III]

(1) Androgen
(2) Melatonin
(3) Glucogen
(4) Insulin

Correct Answer: (2) Melatonin

Solution:The pineal gland is a small endocrine gland in the brain of most vertebrates. The pineal gland produces melatonin, a serotonin-derived hormone which modulates sleep patterns in both circadian and seasonal cycles.

30. Who discoved Ribosome in cells? [RRB RPF/RPSF SI Exam, 10.01.2019 Shift-III]

(1) D. Ivanovaski
(2) Stifens Halls
(3) George Emil Pailade
(4) Alek Jafri

Correct Answer: (3) George Emil Pailade

Solution:Ribosomes were first observed in the mid-1950s by Romanian-American cell biologist George Emil Palade, using an electron microscope, as dense particles or granules.

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