Biology (Railway)

31. In a plant, which of the following is converted into seed? [RRB ALP & Technician Exam, 17.08.2018 Shift-I]

(1) stigma
(2) ovary
(3) style
(4) ovule

Correct Answer: (4) ovule

Solution:In plants, fertilization occurs when one of the sperm cells fuses with the egg inside of an ovule. After fertilization occurs, each ovule develops into a seed. Each seed contains a tiny, undeveloped plant called an embryo. The ovary surrounding the ovules develops into a fruit that contains one or more seeds.

32. The motile germ cell is called a/an: [RRB ALP & Technician Exam, 17.08.2018 Shift-III]

(1) Gamete
(2) Male gamete
(3) Female gamete
(4) Isogamete

Correct Answer: (2) Male gamete

Solution:A germ cell is any biological cell that gives rise to the gametes of an organism that reproduces sexually. The motile germ cell is called the male-gamete.

33. The egg is carried from the ovary to the womb through: [RRB ALP & Technician Exam, 17.08.2018 Shift-III]

(1) the cervix
(2) the vas deferens
(3) the oviduct
(4) the uterus

Correct Answer: (3) the oviduct

Solution:Fallopian tubes, or oviducts, connect the ovaries and uterus. They are also the place where the egg and sperm meet and fertilization occurs. In addition, the tubes have the ability to carry the eggs/embryos to the uterus.

34. Dwarfness can be controlled by treating plants with: [RRB ALP & Technician Exam, 17.08.2018 Shift-III]

(1) Cytokinin
(2) Ethylene
(3) Gibberellic acid
(4) Auxin

Correct Answer: (3) Gibberellic acid

Solution:Gibberellic acid is a hormone found in plants. It is used to treat plants that have dwarf phenotypes. The gibberellins stimulate plant growth in these dwarf plants.

35. Which of the following plant tissues is capable of cell division? [RRB ALP & Technician Exam, 17.08.2018 Shift-III]

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

Correct Answer: (3) Meristem

Solution:Meristematic tissue or meristems, as they are also called are tissues that have the ability to enlarge, stretch and differentiate into other types of cells as they mature. The cells of this tissue are generally young and immature, with the power of continuous division.

36. The_________ has abundant white fibres. [RRB ALP & Technician Exam, 20.08.2018 Shift-I]

(1) ligament
(2) tendon
(3) cartilage
(4) bone

Correct Answer: (2) tendon

Solution:A tendon is composed of dense white fibrous connective tissue in which there is a greater proportion of white inelastic fibres than of elastic fibres. The dominance of the (white, inelastic) collagen fibres contributes to the considerable mechanical strength of white fibrous tissue. In tendons, white fibrous tissue attaches muscles to bones and/or other structures.

37. The reproductive parts of a flower are: [RRB ALP & Technician Exam, 20.08.2018 Shift-I]

(1) Stamens and carpels
(2) Calyx and carpels
(3) Calyx and corolla
(4) Corolla and stamens

Correct Answer: (1) Stamens and carpels

Solution:The four main parts of flowers are sepals, petals, stamens, and carpels. The stamens are male reproductive structures that produce pollen. The carpels are female reproductive structures that produce egg cells and protect a developing baby plant, or embryo. A carpel is the innermost part of a flower that is usually surrounded by stamens, both of which are surrounded by petals.

38. Involuntary actions in human beings such as blood pressure, salivation and vomiting are controlled by the: [RRB ALP & Technician Exam, 20.08.2018 Shift-I]

(1) Medulla
(2) Spinal cord
(3) Pons
(4) Hypothalamus

Correct Answer: (1) Medulla

Solution:The medulla oblongata is part of the brain stem that controls most of involuntary actions such as breathing, pumping action of the heart, peristalsis, salivation, sneezing, vomiting, and control of blood pressure. Involuntary actions are activities in our bodies that are not under our conscious control but occur automatically.

39. _________are the carriers of heredity material. [RRB ALP & Technician Exam, 20.08.2018 Shift-I]

(1) Gametes
(2) Genes
(3) Genetics
(4) Germ cells

Correct Answer: (2) Genes

Solution:Cells, chromosomes, genes, and DNA are all carriers of genetic material. Everything that determines who we are and what is passed down over generations lies within these few basic genetic units. A gene is the basic physical and functional unit of heredity. Genes are made up of DNA.

40. Which of the following animals can change its sex? [RRB ALP & Technician Exam, 20.08.2018 Shift-III]

(1) Planarian
(2) Snail
(3) Ascaris
(4) Nereis

Correct Answer: (2) Snail

Solution:Many species undergo sex change at some point in their lives, particularly after reaching a certain degree of maturity or size. Snails called slipper limpets are born male, but they turn into females later in life. Sex change is believed to be triggered by visual, behavioral, and chemical factors.