416: Which of the following crops helps in nitrogen fixation?
(a) Rice
(b) Wheat
(c) Maize
(d) Beans
417: Indian farmers are unhappy over the introduction of Terminator Seed Technology because the seeds produced by this technology are expected to
(a) show poor germination
(b) form low-yielding plants despite the high quality
(c) give rise to sexually sterile plants
(d) give rise to plants incapable of forming viable seeds
Explanation:
'Terminator Seed Technology' is a bane towards Indian Farmers because seeds produced from this technology gives rise to plants incapable of forming viable seeds. Faremers cannot use thus produced seed for sowing purpose next year/season and has to get fresh seed every year from the seed company which monopolises and may increase arbitrarily the cost of seed.
418: Some medicines are given in the form of capsules. The capsules are made of
(a) Paper
(b) Gelatinous material
(c) Embryonic tissue
(d) Starch
419: Neutron was discovered by:
(a) Ouo Hahn
(b) Enrico Fermi
(c) Lise Meitner
(d) James Chadwick
420: Which one of the following genetic diseases is sex-linked ?
(a) Royal haemophilia
(b) Tay-Sachs disease
(c) Cystic fibrosis
(d) Hypertension
Explanation:
Haemophilia is sometimes referred to as the Royal haemophilia as the queen Victoria had no ancestors with the condition but soon after the birth of her eighth child, 'Leopald' in 1853 it became avident that he had haemophilia. Haemophilia is a X-linked recessive disease characterised by 'non-clotting' of blood.
Hypertension is high blood pressure.
Tay sachs disease is a fatal genetic disorder in which harmful quantities of a fatty substance 'ganglioside' GM2 accumulates in the nerve cells of brain. The affected children usually die by the age 5.
Cystic fibrosis is an autosomal recessive genetic disease of body's mucus glands. It primarily affects the respiratory and digestive systems in children and young adults.