Biology (Part-VI) (Railway)

Total Questions: 50

41. Which of the following organisms shows a parasitic nutritive strategy? [RRB Group 'D' CBT Exam, 02.09.2022 (Shift-I)]

(1) Mushroom
(2) Cuscuta
(3) Amoeba
(4) Yeast

Correct Answer: (2) Cuscuta

Solution:Cuscuta is a parasitic plant which develops special roots called haustoria.

• They are non-green, and they derive nourishment by using their haustoria to gain access to the food and water conducting tissues of the host plant.

42. The figure given below shows the different stages of gradual decay of tooth in humans. All of the following statements related to tooth decay are correct except one. Which one is NOT correct [RRB Group 'D' CBT Exam, 02.09.2022 (Shift-I)]

(1) Acids soften the enamel, causing tooth ache and tooth loss.
(2) Bacteria break down sugars and produce acids
(3) Bacteria act on leftover food in the mouth
(4) No role of bacteria, caused by a virus

Correct Answer: (4) No role of bacteria, caused by a virus

Solution:Tooth decay is damage to a tooth's surface, or enamel.

• It happens when bacteria in our mouth make acids that attack the enamel.

• Tooth decay can lead to cavities (dental caries), which are holes in our teeth, that can cause pain, infection, and even tooth loss.

43. The movement of food in the alimentary canal is brought about by the smooth muscles in the body. Which of the following options has all the organs having smooth muscles? [RRB Group 'D' CBT Exam, 02.09.2022 (Shift-I)]

(1) Blood vessels, ureters, bones
(2) Heart, iris of the eye, bones
(3) Iris of the eye, bronchi of lungs, ureters
(4) Bones, ureters, bronchi of lungs

Correct Answer: (3) Iris of the eye, bronchi of lungs, ureters

Solution:Smooth muscle is a type of non-striated muscle that is found in the walls of hollow organs and blood vessels. It is present in all of the organ systems below:

• Gastrointestinal tract

• Cardiovascular - blood vessel and lymphatic vessels

• Renal - urinary bladder; ureter (tube that carries urine from the kidney to the bladder)

• Genital - uterus, both male and female reproductive tracts

• Respiratory tract: bronchi of lungs

• Integument - the skin arrector pili of the skin

• Sensory - the ciliary muscle and iris of the eye.

44. What is the main difference observed a between slide of human cheek cells and a slide of onion peel when viewed under compound microscope? [RRB Group 'D' CBT Exam, 02.09.2022 (Shift-I)]

(1) Presence of cell wall in human cheek cells
(2) Presence of plastids in cheek cells
(3) Presence of mitochondria in onion peel cells
(4) presence of cell wall in onion peel cells

Correct Answer: (4) presence of cell wall in onion peel cells

Solution:The cell wall is only present in a plant cell, which gives a definite shape and structure to the plant cell.

• The cell wall of the plant is mainly made up of cellulose.

• It is a non-living part of the plant cell.

45. Which of the following activities is environmentily friendly? [RRB Group 'D' CBT Exam, 02.09.2022 (Shift-I)]

(1) Using polythene bags for shopping
(2) Using ACs and coolers during the summer
(3) Using solar-power for generation of electricity
(4) Construction of skyscrapers

Correct Answer: (3) Using solar-power for generation of electricity

Solution:Solar power is a renewable and replenishable source of energy.

• Utilizing solar energy for producing electricity is environment friendly as it causes no pollution.

46. Which of the following statement is INCORRECT regarding the surgical methods of birth control? [RRB Group 'D' CBT Exam, 02.09.2022 (Shift-I)]

(1) They are also called sterilisation procedures
(2) In males vas deferens and in females fallopian tube is blocked
(3) They block gamete transport and prevent fertilisation.
(4) They are not very effective methods

Correct Answer: (4) They are not very effective methods

Solution:The surgical method of Birth control implants are almost 100% effective.

• It's the most effective form of reversible contraception available.

• Surgical methods are highly effective but are mostly irreversible and therefore are offered to multiparous.

47. From the options given below, select the organism having a three-chambered heart. [RRB Group 'D' CBT Exam, 09.09.2022 (Shift-II)]

(1) Tiger
(2) Fish
(3) Salamander
(4) Pigeon

Correct Answer: (3) Salamander

Solution:Salamander is an amphibian with a three-chambered heart.

• The chambered heart has two auricles and one ventricle.

• In the three chambered heart, partial mixing of oxygenated and deoxygenated blood takes place.

48. The functions of bile juice are mentioned below. Select the option that is NOT the function of bile juice. [RRB Group 'D' CBT Exam, 09.09.2022 (Shift-II)]

(1) Has a protein digesting enzyme that helps in the digestion of proteins
(2) Breaks down large fat globules into smaller ones
(3) Increases the efficiency of the action of pancreatic enzymes
(4) Provides alkaline medium to the food for the action of pancreatic enzymes

Correct Answer: (1) Has a protein digesting enzyme that helps in the digestion of proteins

Solution:Bile is a digestive juice secreted by the liver.

• Although it does not contain any digestive enzymes, it plays an important role in the digestion of fats.

• Bile juice has bile salts such as sodium taurocholate and sodium glycocholate.

• These break down large fat globules into smaller globules and make the small intestine alkaline so that the lipase present in the pancreatic enzymes gets activated and can easily act on them.

49. Which of the following statements about plant nutrition is INCORRECT? [RRB Group 'D' CBT Exam, 09.09.2022 (Shift-II)]

(1) Iron and manganese are both considered micronutrients.
(2) Minerals and nutrients are poorly absorbed by water.
(3) Plants, in general, make use of the water in the soil at the root zone.
(4) Carbon is taken up by green plants from atmospheric carbon dioxide.

Correct Answer: (2) Minerals and nutrients are poorly absorbed by water.

Solution:In plants, minerals and nutrients are nicely absorbed by water.

• Roots absorb mineral nutrients as ions in soil water.

• Mineral absorption depends on water absorption because the solvent of the soil solution is water.

50. What product(s) is/are transported by the plant transport system from the leaves and roots? [RRB Group 'D' CBT Exam, 09.09.2022 (Shift-II)]

(1) Water only
(2) Carbohydrates and minierals
(3) Energy stores and raw materials
(4) Carbohydrates only

Correct Answer: (3) Energy stores and raw materials

Solution:Plant transport system moves energy stores from leaves and raw materials from roots.

• In plants, it is only water and minerals that need to be transported to its other parts.

• The two types of conducting tissues that perform the function of transport system in plants are Xylem and Phloem.

• The basics function of xylem is to transport water from roots to stem and leaves.

• Phloem is a plant Vascular tissue that conducts Food transporation in the leave.

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