Railway Board offers opulent and revered job posts to its
aspirants. And it is not every year that we get the notification from Railway
offering a good number of vacant seats to the multitude aspirants. But
the current year 2018 brought a pleasant surprise with almost 90,000 seats to
be filled by the valid candidates. Opportunity is here but you have to
welcome it with a provident strategy.
Q1.Peeling of onions causes tears as onions release-
Ans.(b)
Sol. Peeling, cutting or crushing an onion’s tissue releases enzymes called allinases which convert these molecules to sulfenic acids. The sulfenic acid in turn, spontaneously rearranges to form syn-propanethial-s-oxide, the chemical that triggers the tears.
Sol. Peeling, cutting or crushing an onion’s tissue releases enzymes called allinases which convert these molecules to sulfenic acids. The sulfenic acid in turn, spontaneously rearranges to form syn-propanethial-s-oxide, the chemical that triggers the tears.
Q2.Pungency in chillies is due to the presence of
(a) Lycopene
(b) Capsaicin
(c) Carotene
(d) Anthocyanin
Ans.(b)
Sol. Chillies are valued principally for their high pungency and colour. Pungency in chillies is due to the active constituent “Capsaicin” an alkaloid which is extracted from chillies and is used to the medicine. The molecular formula of Capsaicin is C18H27NO3.
Sol. Chillies are valued principally for their high pungency and colour. Pungency in chillies is due to the active constituent “Capsaicin” an alkaloid which is extracted from chillies and is used to the medicine. The molecular formula of Capsaicin is C18H27NO3.
Q3.Rearing silk worms is known as-
(a) Apiculture
(b) Horticulture
(c) Sericulture
(d) Floriculture
Ans.(c)
Sol. Apiculture – Rearing bees
Horticulture – Study of fruit and flower producing plants
Sericulture – Rearing silk worm.
Floriculture – Study of flowers for decoration work.
Sol. Apiculture – Rearing bees
Horticulture – Study of fruit and flower producing plants
Sericulture – Rearing silk worm.
Floriculture – Study of flowers for decoration work.
Q4.Silkworm grows on
(a) Reetha leaves
(b) Ficus leaves
(c) Peach leaves
(d) Mulberry leaves
Ans.(d)
The silkworm is the larva or caterpillar of the domesticated silkmoth, Bombyx mori. It is an economically important insect, being a primary producer of silk. It grows on leaves of the mulberry tree.
The silkworm is the larva or caterpillar of the domesticated silkmoth, Bombyx mori. It is an economically important insect, being a primary producer of silk. It grows on leaves of the mulberry tree.
Q5. Which one of the following is a plant hormone?
(a) Insulin
(b) Thyroxine
(c) Estrogen
(d) Cytokinin
Ans.(d)
The plant hormones are generally classified into five groups, These are :
(i) Abscisic acid
(ii) Auxins
(iii) Cytokinins
(iv) Ethylene
(v) Gibberellins
The plant hormones are generally classified into five groups, These are :
(i) Abscisic acid
(ii) Auxins
(iii) Cytokinins
(iv) Ethylene
(v) Gibberellins
Q6. Quinine, used to treat malaria is obtained from which plant’s part?
(a) Leaf
(b) Root
(c) bark
(d) Flower
Ans.(c)
Quinine was first isolated in 1820 from the bark of a cinchona tree. Bark extracts have been used to treat malaria since at least 1632.
Quinine was first isolated in 1820 from the bark of a cinchona tree. Bark extracts have been used to treat malaria since at least 1632.
Q7. Plants adapted to dry climate are known as
(a) Epiphyt
(b) Xerophyte
(c) Hydrophytes
(d) Mean plants
Ans.(b)
xerophyte is a species of plant that has adapted to survive in a dry environment. Opuntia, madar, Nerium are the major plants of this type.
xerophyte is a species of plant that has adapted to survive in a dry environment. Opuntia, madar, Nerium are the major plants of this type.
Q8. Plants which grow on saline soils are
(a) Xerophytes
(b) Hydrophytes
(c) Halophytes
(d) Succulents
Ans.(c)
Hydrophytes or aquatic plants are plants that have adapted to live in an aquatic environment (saltwater or freshwater). They are also referred as macrophytes. These plants require special adaptations for living submerged in water or at the water’s surface. Plants growing on saline soils or water are called halophytes.
Hydrophytes or aquatic plants are plants that have adapted to live in an aquatic environment (saltwater or freshwater). They are also referred as macrophytes. These plants require special adaptations for living submerged in water or at the water’s surface. Plants growing on saline soils or water are called halophytes.
Q9. A hydrophyte is
(a) A marine animal
(b) An aquatic plant
(c) A plant disease
(d) A rootless plant
Ans.(b)
Hydrophytes or an equatic plants are plants, that have adapted to live in an aquatic environment (salt water or fresh water). They are also referred as macrophytes.
Hydrophytes or an equatic plants are plants, that have adapted to live in an aquatic environment (salt water or fresh water). They are also referred as macrophytes.
Q10. Which of the following is not correctly matched
(a) Autotroph : producer
(b) Haterotroph: Consumer
(c) Saprotroph: Decomposer
(d) Herbivore: Secondary Consumer
Show Answer
Ans.(d)
Auttotrophs are the producers in a food chain such as plants on land or algae in water, in contrast to heterotrophs as consumers of autotrophs. Saprotroph, a term used for organisms which obtain nutrients from dead organic matter (this term commonly applies to fungi). A herbivore is an animal anatomically and physiologically adapted to eating plant material (for example foliage) for the main component of its diet. More generally, herbivores feed on autotrophs and are known as primary consumers. Thus option (d) is not correctly matched.
Auttotrophs are the producers in a food chain such as plants on land or algae in water, in contrast to heterotrophs as consumers of autotrophs. Saprotroph, a term used for organisms which obtain nutrients from dead organic matter (this term commonly applies to fungi). A herbivore is an animal anatomically and physiologically adapted to eating plant material (for example foliage) for the main component of its diet. More generally, herbivores feed on autotrophs and are known as primary consumers. Thus option (d) is not correctly matched.
Q11. Trophic level-I includes:
(a) Herbivorous animals
(b) Carnivorous animals
(c) Omnivorous animals
(d) Green plants
Ans.(d)
Trophic level-I includes all autotrophs which synthesize their food by themselves. All green plants belong to this trophic level. Organisms of trophic level-I usually utilize the radiant energy of the sun to synthesize their oganic molecules.
Trophic level-I includes all autotrophs which synthesize their food by themselves. All green plants belong to this trophic level. Organisms of trophic level-I usually utilize the radiant energy of the sun to synthesize their oganic molecules.
Q12. Fishers survive under the frozen lake, because
(a) Fishes have hot blood
(b) Fishes are in hibernation under it
(c) Water does not freeze near bottom
(d) Ice is the conductor of heat.
Show Answer
Ans.(c)
Lakes and rivers are frozen when the outer temperature decrease below the freezing point in winters. But only the upper layer freezes in the condition. Water remains in liquid form below the upper layer. So fishes and other aquatic creatures can survive even in frozen lake.
Lakes and rivers are frozen when the outer temperature decrease below the freezing point in winters. But only the upper layer freezes in the condition. Water remains in liquid form below the upper layer. So fishes and other aquatic creatures can survive even in frozen lake.
Q13. After bringing out of water fishes die because
(a) They get excess quantity of oxygen
(b) Their body temperature increases
(c) They cannot breathe
(d) They can not move in water
(a) They get excess quantity of oxygen
(b) Their body temperature increases
(c) They cannot breathe
(d) They can not move in water
Ans.(c)
Fish use gills to breath and gills can only bring in oxygen when moist. Out of water, a fish’s gills dries out and then the fish dies.
Fish use gills to breath and gills can only bring in oxygen when moist. Out of water, a fish’s gills dries out and then the fish dies.
Q14. Redness in apple is due to
(a) Anthocyanin
(b) Lycopene
(c) Carotene
(d) Xanthophyll
Ans.(a)
Anthocyanins are the
pigment compounds and responsible for red, purple and blue colours in many
fruits and vegetables. Lycopene pigment is in red colour like tomato, carotene
in carrot and xanthophyll pigment present in beetroot.
Q15. Red colour in tomato is due to
(a) Capsaicin
(b) Carotenoid
(c) Xanthophyll
(d) None of the above
Ans.(b)
carotenoid is responsible for the redness of tomato.
