Biology (Railway)

Total Questions: 50

41. The universal natural auxin of plants is: [RRB ALP & Technician Exam, 20.08.2018 Shift-III]

(1) IBA
(2) citric auxin
(3) NAA
(4) ΙΑΑ

Correct Answer: (4) ΙΑΑ

Solution:Natural auxins are naturally occurring auxins in plants and therefore: regarded as phytohormones. Indole 3-acetic acid (IAA) is the best known and universal auxin, It is found in all plants and fungi.

42. Which part of the human reproductive system helps the embryo to get its nutrition from the mother's blood? [RRB ALP & Technician Exam, 20.08.2018 Shift-III]

(1) Placenta
(2) Fallopian tube
(3) Uterus
(4) Cervix

Correct Answer: (1) Placenta

Solution:The placenta is a flattened circular organ in the uterus of pregnant mammals that nourishes and maintains the fetus through the umbilical cord. This cord is the main link from the fetus to the placenta. Through it, the placenta provides oxygen and nutrients to the growing baby and removes waste products.

43. Which group of animals are exclusively free living marine animals? [RRB ALP & Technician Exam, 20.08.2018 Shift-III]

(1) Arthropoda
(2) Echinodermata
(3) Mollusca
(4) Nematoda

Correct Answer: (2) Echinodermata

Solution:Echinoderm is the common name given to any member of the phylum Echinodermata of marine animals. They are found at every ocean depth. from the intertidal zone to the abyssal zone.

44. Which type of reproduction allows for greater variation to be generated? [RRB ALP & Technician Exam, 21.08.2018 Shift-I]

(1) Binary fission
(2) Asexual reproduction
(3) Multiple fission.
(4) Sexual reproduction

Correct Answer: (4) Sexual reproduction

Solution:Sexual reproduction typically requires the sexual interaction of two specialized organisms, called gametes. with typically a male fertilizing a female of the same species to create a fertilized zygote.It provides variation in terms of genetic diversity because the sperm and egg that are produced contain different combinations of genes than the parent organisms.

45. _________is a part of the male reproductive system in plants. [RRB ALP & Technician Exam, 21.08.2018 Shift-I]

(1) Style
(2) Stigma
(3) Ovary
(4) Stamen

Correct Answer: (4) Stamen

Solution:The stamen is a male reproductive organ of a flower.Its function is to produce and disperse pollen, which carries the plant's sperm cells to the pistil. Mature stamens consist of a filament (stalk) and an anther. They are initiated on floral meristems and form the third of four concentric. organ whorls. The sterile filament provides a vascular connection and positions the anther for pollen dispersal.

46. __________is a multicellular organism. [RRB ALP & Technician Exam, 21.08.2018 Shift-I]

(1) Agaricus
(2) Cyanobacteria
(3) Mycoplasma
(4) Paramecium

Correct Answer: (1) Agaricus

Solution:Agaricus is a genus of mushrooms containing both edible and poisonous species, with possibly over 300 members worldwide. Mushrooms are fungi that are actually multicellular. Fungi are almost entirely multicellular (with yeast, Saccharomyces cerviseae, being a prominent unicellular fungus).

47. Parthenocarpy is defined as: [RRB ALP & Technician Exam, 21.08.2018 Shift-I]

(1) Development of root with fertilisation
(2) Development of fruit with fertilisation
(3) Development of root without fertilisation
(4) Development of fruit without fertilisation

Correct Answer: (4) Development of fruit without fertilisation

Solution:In botany and horticulture, parthenocarpy (literally meaning "virgin fruit") is the natural or artificially induced production of fruit without fertilization of ovules, which makes the fruit seedless. Varieties of the pineapple, banana, cucumber, grape, orange, grapefruit, persimmon. and breadfruit are examples of naturally occurring parthenocarpy.

48. Which of the following is not a hormone found in animals? [RRB ALP & Technician Exam, 21.08.2018 Shift-III]

(1) Insulin
(2) Auxins
(3) Thyroxin
(4) Adrenaline

Correct Answer: (2) Auxins

Solution:Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant.

49. Which of the following is the largest group of animals? [RRB ALP & Technician Exam, 21.08.2018 Shift-III]

(1) Nematoda
(2) Porifera
(3) Arthropoda
(4) Mollusca

Correct Answer: (3) Arthropoda

Solution:Arthropod is any member of the phylum Arthropoda, the largest phylum in the animal kingdom, which Includes such familiar forms as lobsters, crabs, spiders, mites, insects, centipedes, and millipedes. About 84 percent of all known species of animals are members of this phylum.

50. In which of the following permanent tissues, the cells are dead? [RRB ALP & Technician Exam, 29.08.2018 Shift-I]

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

Correct Answer: (3) Sclerenchyma

Solution:The sclerenchyma cells have a thick cell wall that is composed of primary wall and a secondary wall. The primary wall is made up of cellulose while the secondary wall is made up of lignin. The process that involves the formation of the secondary wall is known as lignification. Due to lignification, the cells cannot exchange the material with outside environment i.e. important nutrients cannot enter and harmful substances cannot leave the cell. As a result, these cells lose their living characters at maturity and become dead. After their death, these cells are supposed to provide mechanical support and protection to the plant.

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