Biology (Part-IV) (Railway)

Total Questions: 50

11. Which of the following disease does NOT spread through the air? [RRB NTPC CBT-1 Exam, 13.03.2021 (Shift-I)]

Correct Answer: (4) Cholera
Solution:Cholera is a water borne disease.

• It is an acute diarrhoeal infection caused by eating or drinking food or water that is contaminated with the bacterium Vibrio cholerae.

• Cholera causes severe diarrhea and dehydration.

12. Which causative agent is responsible for spreading swine flu? [RRB NTPC CBT-1 Exam, 13.03.2021 (Shift-I)]

Correct Answer: (2) Virus
Solution:The HINI flu, commonly known as swine flu, is primarily caused by the HINI strain of the flu, (influenza) virus.

• It is a respiratory disease of pigs caused by type A influenza viruses that regularly cause outbreaks of influenza in pigs.

13. Which of the following conditions is NOT caused by a virus? [RRB NTPC CBT-1 Exam, 14.03.2021 (Shift-II)]

Correct Answer: (3) Cholera
Solution:Cholera is a water borne disease that is caused by eating or drinking food or water that is contaminated with the bacterium Vibrio cholerae.

• Cholera causes severe diarrhea and dehydration.

14. Which of the following plant hormones inhibits growth and is responsible for wilting of leaves? [RRB NTPC CBT-1 Exam, 14.03.2021 (Shift-II)]

Correct Answer: (2) Abscisk acid
Solution:Abscisic acid inhibits the plant growth, and also it is responsible for wilting of the leaves, germination of the seed.

• It responsible for stimulating the closure of stomata in the epidermis and also helps in increasing the tolerance of the plants to various stressful situations.

15. Which of the following plant hormones helps in the growth of plant stems? [RRB NTPC CBT-1 Exam, 14.03.2021 (Shift-II)]

Correct Answer: (4) Gibberellin
Solution:Gibberellins are plant hormones involved in regulating stem elongation, germination, dormancy, flowering, and senescence.

• This hormone is regulated by auxin.

• Auxin is involved in regulating cellular growth, differentiation, and expansion.

16. Who is known as the 'Father of Modern Genetics"? [RRB NTPC CBT-1 Exam, 14.03.2021 (Shift-II)]

Correct Answer: (2) Gregor Mendel
Solution:Gregor Mendel is known as the "father of modern genetics."

• Through his pea plant experiments conducted between 1856 and 186, he discovered. the fundamental laws of inheritance.

• He deduced that genes come in pairs and are inherited as distinct units, one from each parent.

• Mendel's observations became the foundation of modern genetics.

17. The system of scientif naming or nomenclature of organism which we use today was introduced by which of the following scientists? [RRB NTPC CBT-1 Exam, 15.03.2021 (Shift-I)]

Correct Answer: (1) Carolus Linnaeus
Solution:Carolus Linnaeus was Swedish naturalist who formalized binomial nomenclature, the modern system of naming organisms.

• He was the first to frame principles for defining natural genera and species of organisms and to create a uniform system for naming them.

• He is known as the "father of modern taxonomy"

18. A ucrose molecule contains ___________carbon atoms. [RRB NTPC CBT-1 Exam, 15.03.2021 (Shift-I)]

Correct Answer: (4) 12
Solution:Each sucrose (C₁₂H₂₂O₁₁) molecule contains 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms.

• Sucrose is a disaccharide, meaning it is made by joining two sugar subunits.

• It is composed of one molecule of glucose connected via an glycosidic bond to one molecule of fructose.

19. Which of the following is a membrane-bound sac filled with digestive enzymes? [RRB NTPC CBT-1 Exam, 15.03.2021 (Shift-I)]

Correct Answer: (3) Lysosomes
Solution:Lysosomes are membrane-enclosed organelles that are known as suicidal bags of the cell.

• They contain digestive enzymes, and break down food, cellular debris and foreign invaders like bacteria.

• In the event that the cell is injured beyond repair, or becomes old, the lysosome digests the cell, hence the name 'suicide bag of the cell'.

20. Cobalt is present in which vitamin? [RRB NTPC CBT-1 Exam, 15.03.2021 (Shift-I)]

Correct Answer: (1) Vitamin B12
Solution:The Kolkata Metro was the first metro railway in India. opening for commercial services from 1984.

• It was the first underground railway to be built in India. with the first trains running in October 1984.

• It is presently the fifth-longest operational metro network in India.