Biology (Part-IV) (Railway)

Total Questions: 50

21. Which hormone regulates the blood sugar level in the body? [RRB NTPC CBT-1 Exam, 01.04.2021 (Shift-I)]

Correct Answer: (2) Insulin
Solution:Insulin helps to Regulate blood sugar levels.

• It's most important in the human body is interaction with glucose to allow the cells of the body to use glucose as energy.

• A lack of effective insulin plays a key role in the development of diabetes.

22. Name the type of nutrition in that the organism takes in nutrients in solution form from dead and decaying matters. [RRB NTPC CBT-1 Exam, 01.04.2021 (Shift-I)]

Correct Answer: (4) Saprophytic nutrition
Solution:Saprophytic nutrition is a process of chemoheterotrophic extracellular digestion involved in the processing of decayed organic matter.

• It occurs in saprotrophs, and is most often associated with fungi (for example Mucor) and soil bacteria.

23. The natural aging of a lake by nutrient enrichment of its water is termed as: [RRB NTPC CBT-1 Exam, 01.04.2021 (Shift-I)]

Correct Answer: (1) Eutrophication
Solution:Eutrophication is a natural process that results from accumulation of nutrients in lakes or other bodies of water.

• The excess algae and plant matte eventually decompose, producing large amounts of carbon dioxide.

• Eutrophication sets off a chain reaction in the ecosystem, starting with an overabundance of algae and plants.

• This lowers the pH of water, a process known as Lake Acidification.

24. Which tissue is responsible for transportation of water in plants? [RRB NTPC CBT-1 Exam, 05.04.2021 (Shift-I)]

Correct Answer: (1) Xylem
Solution:Xylem transports and stores water and water-soluble nutrients in vascular plants.

• It transports water and some nutrients from the roots to the leaves.

• Phloem transports sucrose and other nutrients throughout the plant.

25. "The Origin of Species' was written by: [RRB NTPC CBT-1 Exam, 05.04.2021 (Shift -I)]

Correct Answer: (4) Charles Darwin
Solution:The Origin of Species was published on 24 November 1859.

• It is a work of scientific literature by Charles Darwin that is considered to be the foundation of evolutionary biology.

• It offered a theoretical explanation for the empirical principle of faunal sequence.

26. The system scientific naming Organism was introduced by: [RRB NTPC CBT-1 Exam, 05.04.2021 (Shift-I)]

Correct Answer: (1) Carolus Linnaeus
Solution:In 1758, Carolus Linnaeus proposed a system for classifying organisms.

• In this system, each species is assigned a two-part name for this reason, the system is known as binomial nomenclature.

• He published it in his book, Systema Naturae.

27. The normal systolic pressure of human blood is: [RRB NTPC CBT-1 Exam, 05.04.2021 (Shift-I)]

Correct Answer: (3) 120 mmHg
Solution:Normal systolic blood pressure is less than 120 mm Hg.

• Normal diastolic blood pressure is less than 80 mm Hg.

28. Which vitamin activates proteins and calcium essential for blood clotting? [RRB NTPC CBT-1 Exam, 06.04.2021 (Shift-I)]

Correct Answer: (1) Vitamin K
Solution:Vitamin K activates proteins that play a role in blood clotting, calcium metabolism and heart health.

• One of its most important functions of Vitamin K is to regulate calcium deposition.

29. Which of the following is NOT a correct statement? [RRB NTPC CBT-1 Exam, 06.04.2021 (Shift-I)]

Correct Answer: (2) The stomach receives the secretion of the liver and pancreas
Solution:The digestive role of the liver is to produce bile and export it to the duodenum.

• The gallbladder primarily stores, concentrates, and releases bile.

• The pancreas produces pancreatic juice, which contains digestive enzymes and bicarbonate ions, and delivers it to the duodenum.

30. Which of the following is used in the treatment of cancer? [RRB NTPC CBT-1 Exam, 06.04.2021 (Shift-I)]

Correct Answer: (2) An isotope of cobalt
Solution:Co-60 is used medically for radiation therapy as implants and as an external source of radiation exposure.

It is used in radiotherapy.

• It is used in radiation treatment of foods for sterilization (cold pasteurization).

• It is used in industrial radiography to detect structural flaws in metal parts.