The chemical substance which destroy weeds ……
A) IAA
B) 2 – 4 – D
C) ABA
D) NAA
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The chemical sprayed by United States of America forces to destroy forests and fields in Vietnam is ……………
A) Agent Orange
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……………. defined an element as any substance that cannot be decomposed into further simple substance by physical or chemical change.
B) Robert Boyle
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Bacteria that destroy some pests is A) Bacillus Turingenesis
A) Bacillus Turingenesis
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Weeds and some wild plants are not eaten by insects, pests and animals because
C) The plants may contain toxic chemicals and unpleasant to taste
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When the particles of a substance contain only one type of atoms, that substance is called a / an
Correct option is B) element
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The molecular mass of a substance is the sum of the atomic masses of all the atoms in a molecule of the substance.
Correct option is A) 98 U
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Sea weeds are used in the production of
(C) Phycocolloids
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Match the following: Group – A 1. Sea weeds
1) C 2) A 3) E 4) G 5) B
2 Answers 3 views
You have collected the information about ocean weeds. Identify the ocean weed from given below names.
(B) Agar-Agar
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State True or False: 1. Fire was used by early man to destroy forests. 2. Rock paintings are not informative.
1. False 2. False 3. True 4. True 5. True
2 Answers 1 views