Consider the following statements : 1. Moringa (drumstick tree) is a leguminous evergreen tree. 2. Tamarind tree is endemic to South Asia. 3. In India, most of the tamarind is collected as minor forest produce. 4. India exports tamarind and seeds of moringa. 5. Seeds of moringa and tamarind can be used in the production of biofuels. Which of the statements given above are correct?
- A.1, 2, 4 and 5
- B.3, 4 and 5
- C.1, 3 and 4
- D.1, 2, 3 and 5
Correct answer
Explanation
The correct answer is B, 3, 4 and 5. Moringa is not a legume and tamarind is not native to South Asia, so statements 1 and 2 are false.
Moringa oleifera, the drumstick tree, belongs to its own family Moringaceae, not to the legume family Fabaceae, and it sheds its leaves in dry spells rather than being a true evergreen. Tamarind, Tamarindus indica, is native to tropical Africa; it reached India long ago and grew so common that it was once thought Indian, but it is not endemic here. India is the world's largest producer of tamarind, most of it gathered from forests and village trees as minor forest produce, and it exports both tamarind and moringa seeds and leaf powder. Oil from moringa seeds and from tamarind seeds has been tested as a feedstock for biodiesel.
A is wrong because it includes the false statements 1 and 2. C is wrong because it includes statement 1 and leaves out statement 5. D is wrong because it includes statements 1 and 2 and leaves out statement 4.
Exam tip: tamarind is African in origin; moringa is Moringaceae, not a legume.
Practice Questions
View allThe potential difference between the terminals of an electrical heating device is 40 V, when it draws a current of 2 A from the source. Which one of the following is the correct value of current drawn by the heating device if the potential is increased to 140 V?
- A.7 A
- B.5 A
- C.4 A
- D.2 A
Show answer
By Ohm's law the heater's resistance is 40 V divided by 2 A, which is 20 ohms, so at 140 V it draws 140 divided by 20, or 7 A. Ohm's law states that, at constant temperature, the current through a conductor is directly proportional to the potential difference across…
Read the full explanation →Consider the following statements in the light of octane number and cetane number of fuels: 1. Cetane number is used for gasoline and octane number is used for diesel. 2. Octane number of n-hexadecane is 100 and cetane number of isooctane is 100. Which of the statements given above is/are correct?
- A.1 only
- B.2 only
- C.Both 1 and 2
- D.Neither 1 nor 2
Show answer
Both statements swap the two scales: octane number rates petrol, cetane number rates diesel, and their reference fuels are the other way round.
Read the full explanation →Which one among the following statements related to human eye is correct?
- A.For a person suffering from short-sight defect, the image of a distant object is focused behind the retina.
- B.Short-sight defect can be corrected by a converging spectacle lens.
- C.For a person suffering from long-sight defect, the image of a near object is focused behind the retina.
- D.Long-sight defect can be corrected by a diverging spectacle lens.
Show answer
In long-sightedness (hypermetropia) the eye cannot see nearby objects clearly because their image is formed behind the retina.
Read the full explanation →When sunlight (white light) falls on a triangular glass prism, a band of colours called a spectrum is obtained. Which one among the following represents this effect appropriately?
- A.Reflection
- B.Diffraction
- C.Refraction
- D.Dispersion
Show answer
The splitting of white light into its seven component colours by a prism is called dispersion. White light is a mixture of colours, and glass bends each colour by a different amount because its refractive index depends on wavelength.
Read the full explanation →Which one of the following statements is correct?
- A.The number of electrons in alpha particle is 2.
- B.The coordination number of EDTA is 6.
- C.The charge of beta (β) particle is +2.
- D.Both carbon and silicon form ionic compounds.
Show answer
EDTA is a hexadentate ligand: one EDTA ion binds a metal ion through six donor atoms, so it forms complexes with coordination number 6.
Read the full explanation →