Biology (Part-II) (Railway)

Total Questions: 50

11. The breakdown of glucose to pyruvate takes place in the ___________during energy production. [RRB ALP & Technician Exam, 30.08.2018 Shift-III]

(1) nucleus
(2) mitochondria
(3) endoplasmic reticulum
(4) cytoplasm

Correct Answer: (4) cytoplasm

Solution:Glucose breaks down in cytoplasm (in the cellular matrix called cytosol) into pyruvate. They then enter into the mitochondrion of the cell. In the absence of oxygen (anaerobic conditions) pyruvate undergoes fermentation either lactic acid fermentation or alcohol fermentation takes place.

12. Which of the following is NOT a simple permanent tissue? [RRB ALP & Technician Exam, 30.08.2018 Shift-III]

(1) Parenchyma
(2) Sclerenchyma
(3) Collenchyma
(4) Xylem

Correct Answer: (4) Xylem

Solution:Xylem is a complex tissue forming a part of the vascular bundle. It is primarily Instrumental for conduction of water and solutes, and also for mechanical support. Primary xylem originates from the procambium of apical meristem, and secondary xуlem from the vascular cambium. As a complex tissue it consists of different types of cells and elements, living and non-living.

13. Primary growth in plants occurs by: [RRB ALP & Technician Exam, 31.08.2018 Shift-I]

A. Vertical meristem

B. Lateral meristem

C. Intercalary meristem

D. Apical meristem

(1) A, B, C and D
(2) C and D
(3) B, C and D
(4) A, B and D

Correct Answer: (2) C and D

Solution:The increase in length of the shoot and the root is referred to as primary growth. It is the result of cell division in the shoot apical meristem. An apical meristem is a region of high cell division (lots and lots of mitosis) that contributes to the extension of the plant. One more meristem is the intercalary meristem. This is a region of rapid cell division at the base of nodes.

14. Which part of the brain regulates breathing? [RRB ALP & Technician Exam, 31.08.2018 Shift-I]

(1) Mid-brain
(2) Fore-brain
(3) Medulla
(4) Cerebellum

Correct Answer: (3) Medulla

Solution:The primary role of the medulla is regulating our involuntary life sustaining functions such as breathing, swallowing and heart rate. As part of the brain stem, it also helps transfer neural messages to and from the brain and spinal cord. It is located at the junction of the spinal cord and brain.

15. A section of DNA that provides information for one protein is called the ___________. [RRB ALP & Technician Exam, 31.08.2018 Shift-I]

(1) nucleus
(2) lysosome
(3) gene
(4) chromosome

Correct Answer: (3) gene

Solution:A section of DNA that provides information for a protein is called a Gene. It is a section or sequence of DNA which is present on the chromosome. Gene is responsible for determining specific traits of an organism. It is passed from one generation to the next generation.

16. Which of the following statements is true? [RRB ALP & Technician Exam, 31.08.2018 Shift-II]

(1) In grasshoppers and some insects, the male has only four sex chromosomes.
(2) A male individual contains one X and two Y chromosomes.
(3) In human beings there are 46 chromosomes, of which 42 (21 pairs) are autosomes.
(4) In diploid organisms having separate sexes, a specific pair of chromosomes in each diploid cell determines the sex of the individual; they are called sex chromosomes.

Correct Answer: (4) In diploid organisms having separate sexes, a specific pair of chromosomes in each diploid cell determines the sex of the individual; they are called sex chromosomes.

Solution:Diploid describes a cell that contain two copies of each chromosome. Humans have 46 chromosomes in each diploid cell. Among these. there are two sex-determining chromosomes, and 22 pairs of autosomal, or non-sex, chromosomes. The total number of chromosomes in diploid cells is described as 2n, which is twice the number of chromosomes in a haploid cell (n).

17. Which of the following helps in the clotting of blood? [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-I]

(1) Red blood corpuscles
(2) Platelets
(3) White blood corpuscles
(4) Hemoglobin

Correct Answer: (2) Platelets

Solution:Platelets, also called thrombocytes, are a component of blood whose function (along with the coagulation factors) is to react to bleeding from blood vessel injury by clumping, thereby initiating a blood clot. Platelets originate from cells known as megakaryocytes, which are found in the bone marrow. They are important for normal blood clotting.

18. The production of a new individual from an outgrowth of a parent individual is called: [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-I]

(1) Budding
(2) Regeneration
(3) Fission
(4) Vegetative propagation

Correct Answer: (1) Budding

Solution:Budding refers to the process of production of new organism from an outgrowth of the parent individual. It is seen in Hydra, Yeast, Scypha, etc.In organisms such as Hydra, a bud develops as an outgrowth at one specific site. These buds develop into tiny individuals and when fully mature, detach from the parent body and become new independent individuals.

19. Which of the following statements is INCORRECT? [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-I]

(1) DNA is a macromolecule or polymer.
(2) The best donor for blood is an O⁻ᵛᵉ blood donor.
(3) A breeding experiment dealing with two characters at the same time is called a 'monohybrid cross'.
(4) Mendel was the first scientist to visualise a gene as a unit of inheritance in 1886.

Correct Answer: (3) A breeding experiment dealing with two characters at the same time is called a 'monohybrid cross'.

Solution:A breeding experiment dealing with a single character is called a monohybrid cross.A monohybrid cross is a mating between two organisms with different variations at one genetic chromosome of interest. The character(s) are governed by two or multiple variations for a single locus.A breeding experiment dealing with two characters at the same time is called a dihybrid cross.

20. The fluid containing lymphocytes flows from: [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-I]

(1) Tissue to heart
(2) Heart to tissue
(3) Tissue to tissue
(4) Tissue to other organs

Correct Answer: (1) Tissue to heart

Solution:Lymph is a fluid, containing lymphocytes, that circulates throughout the body in the lymphatic system. Lymph flow is unidirectional from the tissues through lymphatic vessels, eventually dumping lymph into the vena cava. It flows in one direction only (towards the heart).

« Previous 123 4 5 Next »