From which one of the following plants, the insecticide pyrethrum is prepared?
(a) Vetiver
(b) Cymbopogon
(c) Chrysanthemum
(d) Tephrosia
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Nowadays these plants are grown as ornamental plants.
B) xerophytes
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The first widespread insecticide used is
Correct option is A) DDT
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a) Synthesis of waste products in plants – is very slow. b) Plants do not have specific excretory organs
(A) Both a & b are true
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Read the paragraph given below and answer. Most of the plants are flowering plants. Their characters are quite remarkable.
(B) Unisexual flowers
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Vidhya and Vijay were studying the effect of certain radiations on flower plants. Vidhya exposed her plants to UV rays and Vijay exposed his plants
Frequency of UV rays is greater than infrared rays, hence UV rays are much more energetic than infrared rays. Plants cannot tolerate the exposure of high energy rays. As a...
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The long plants always produce long plants only
(D) Short plants also produced
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In pea plants, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plants to
Answer is (B) 3 : 1
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The method of removing individual plants or small groups of plants ………
D) Selective harvesting
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Plants are autotrophic. Can you think of some plants that are partially heterotrophic?
Certain insectivorous plants, like bladderwort and venus fly trap, are partially heterotrophic.
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Which of the following alcohols cannot be prepared by reduction of carbonyl compounds?
Option : (c) 2-Methylpentan-2-ol
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