Biology (Part-V) (Railway)

Total Questions: 50

11. Yeast is used in preparation of___________ [RRB Group 'D' CBT Exam, 22.08.2022 (Shift-I)]

Correct Answer: (4) Wine
Solution:Yeast is used in the production of Alcohol via a process known as fermentation.

• In the absence of oxygen, yeast converts the sugars of the fruit into alcohol and carbon dioxide through the process of fermentation.

• The most common yeast associated with winemaking is Saccharomyces cerevisiae.

12. What are colourless cells called? [RRB Group 'D' CBT Exam, 22.08.2022 (Shift-I)]

Correct Answer: (2) Leucoplastids
Solution:Leucoplasts are colourless plastids because they lack pigments.

• They mainly help in storage of food compounds like starch. proteins or fats.

• They do not take part in photosynthesis and are found in tubers, roots, seeds, and bulbs.

13. Movement in most of the animals is a coordinated activity of which of the following system/systems? [RRB Group 'D' CBT Exam, 22.08.2022 (Shift-I)]

Correct Answer: (4) Muscular, skeletal and nervous systems
Solution:Locomotion requires a perfect coordinated activity of muscular, skeletal and neural systems.

• Movement of our limbs, jaws, tongue, etc, require muscular movement.

• The contractile property of muscles are effectively used for locomotionand other movements by human beings and majority of multicellularorganisms

14. Humans have_____________pairs of autosomes. [RRB Group 'D' CBT Exam, 22.08.2022 (Shift-I)]

Correct Answer: (1) 22
Solution:In humans, cach cell normally contains 23 pairs of chromosomes, for a total of 46.

• Twenty-two of these pairs, called autosomes, look the same in both males and females.

• The 23rd pair, the sex chromosomes, differ between males and females.

• Females have two copies of the X chromosome, while males have one X and one Y chromosome.

15. Which of the following foods is high in iron ? [RRB Group 'D' CBT Exam, 22.08.2022 (Shift-II)]

Correct Answer: (3) Jaggery
Solution:Jaggery is rich in iron in addition to other nutrients like calcium, potassium, magnesium, phosphorous and manganese.

• Regular consumption of jaggery facilitates the absorption of iron and it also increases the haemoglobin count.

16. The phloem is the plant's vascular tissue that transports__________. [RRB Group 'D' CBT Exam, 22.08.2022 (Shift-II)]

Correct Answer: (2) nutrients
Solution:The vascular system is comprised of two main types of tissue: the xylem and the phloem.

• The xylem distributes water and dissolved minerals upward through the plant, from the roots to the leaves.

• The phloem carries food and nutrients downward from the leaves to the roots.

17. Many scientists before Mendel had started studying the inheritance of traits in peas and other organisms, but Mendel succeeded in giving the laws of Inheritance. Some reasoning for Mendel's success are mentioned below. All the correct except one. Select the INCORRECT reasonig > [RRB Group 'D' CBT Exam, 22.08.2022 (Shift-II)]

Correct Answer: (1) He worked with a small sample size.
Solution:In his experiments, Mendel used very large sample sizes and kept accurate records of his results.

• He experimented with nearly 30,000 pea plants.

• He carried out experiments up to the second and third generations and maintained the statistical records of all the experiments and analyzed them carefully.

18. To which of the following organisms is the Cell theory given by Schleiden and Schwann NOT appliable? [RRB Group 'D' CBT Exam, 22.08.2022 (Shift-II)]

Correct Answer: (1) Viruses
Solution:The Cell Theory was first given by M.J Schleiden and Theodor Schwann in 1839.

• It states that all the living beings whether plants or animals are composed of cells that are from preexisting cells.

• Since viruses are not made of cells, and do not use cells in any of their processes, they are not related to the cell theory.

19. Which flower of Himalaya has antiseptic properties and hence can help in the healing of bruises? [RRB Group 'D' CBT Exam, 22.08.2022 (Shift-II)]

Correct Answer: (1) Brahma Kamal
Solution:Brahma Kamal or Brahma Kamalam is an endemic and rare flowering plant species that is mainly found in the Indian Himalayan regions.

• It has antiseptic properties and can help heal wounds, cuts, and bruises.

• When applied to wounds, the flower sticks to the area and seals it, thus stopping the bleeding and helping in its healing.

• Brahma Kamal also known as the king of Himalayan flower, who blossoms once in a year.

20. The amount of __________in a plant cell alters its structure in order to facilitate movement. [RRB Group 'D' CBT Exam, 22.08.2022 (Shift-II)]

Correct Answer: (1) water
Solution:Plants require large amounts of water just to satisfy the requirements of transpiration: a large treemay transpire hundreds of litres of water in a day.

• Water evaporates from leaves through stomates, which are pores whose aperture is controlled by two guard cells. Plants must keep their stomatesopen in order to take up CO, as the substrate (Early material for chemical reaction) for photosynthesis.

• In the process, water islost from the moist internal surfaces of the leaf through the stomatal pores.

• Water lossalso has a benefit in maintaining the leaf temperature through evaporative cooling