The best and a highly recognised natural system of classification was proposed by George Bentham and Sir Joseph Hooker, two great British botanists associated with Royal Botanical Garden at Kew, in their General Plantarum (1862-1883). They classi fied plants strictly on the basis of a natural scheme. This system is based not only on the characters of the reproductive organs and structural relationship, but all the other important characters are also taken into consideration and the plants are classified according to their related characters.

Correct Option: D

The best and a highly recognised natural system of classification was proposed by George Bentham and Sir Joseph Hooker, two great British botanists associated with Royal Botanical Garden at Kew, in their General Plantarum (1862-1883). They classi fied plants strictly on the basis of a natural scheme. This system is based not only on the characters of the reproductive organs and structural relationship, but all the other important characters are also taken into consideration and the plants are classified according to their related characters.

Pyrometallurgy consists of the thermal treatment of minerals and metallurgical ores and concentrates to bring about physical and chemical transformations in the materials to enable recovery of valuable metals. During pyrometallic processing, an ore, after being beneficiated (concentrated by crushing, grinding, floating and drying), is sintered or roasted (calcined) with other materials such as baghouse dust and flux. The concentrate is then smelted, or melted, in a blast furnace in order to fuse the desired metals into impure molten bullion.

Correct Option: C

Pyrometallurgy consists of the thermal treatment of minerals and metallurgical ores and concentrates to bring about physical and chemical transformations in the materials to enable recovery of valuable metals. During pyrometallic processing, an ore, after being beneficiated (concentrated by crushing, grinding, floating and drying), is sintered or roasted (calcined) with other materials such as baghouse dust and flux. The concentrate is then smelted, or melted, in a blast furnace in order to fuse the desired metals into impure molten bullion.

Nyctalopia (night blindness) is a condition making it difficult or impossible to see in relatively low light. It is one of the first signs of Vitamin A deficiency. Xerophthalmia, keratomalacia, and complete blindness can also occur since Vitamin A has a major role in phototransduction.

Correct Option: A

Nyctalopia (night blindness) is a condition making it difficult or impossible to see in relatively low light. It is one of the first signs of Vitamin A deficiency. Xerophthalmia, keratomalacia, and complete blindness can also occur since Vitamin A has a major role in phototransduction.

Damping off is a horticultural disease or condition, caused by a number of different pathogens that kill or weaken seeds or seedlings before or after they germinate. Pythium, a genus of parasitic oomycete, are most often responsible for damping-off. Along with Rhizoctonia solani, attacks by Pythium are most associated with producing roughly circular patches of dead seedlings.

Correct Option: D

Damping off is a horticultural disease or condition, caused by a number of different pathogens that kill or weaken seeds or seedlings before or after they germinate. Pythium, a genus of parasitic oomycete, are most often responsible for damping-off. Along with Rhizoctonia solani, attacks by Pythium are most associated with producing roughly circular patches of dead seedlings.

The best-known and most common chromosome abnormality in humans is Down’s syndrome, a condition associated with an extra chromosome 21. Down’s syndrome individuals also almost invariably develop Alzheimer’s disease, a form of dementia that is fairly common among the elderly. People with Down’s syndrome develop this disease in their fourth or fifth decade of life, much sooner than other people.

Correct Option: B

The best-known and most common chromosome abnormality in humans is Down’s syndrome, a condition associated with an extra chromosome 21. Down’s syndrome individuals also almost invariably develop Alzheimer’s disease, a form of dementia that is fairly common among the elderly. People with Down’s syndrome develop this disease in their fourth or fifth decade of life, much sooner than other people.