What regulates the flow of water through the xylem...? Mcqs

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What regulates the flow of water through the xylem...?

(A) Passive transport by the endodermis
(B) The number of companion cells in the phloem

(C) The evaporation of water from the leaves
(D) Active transport by sieve-tube membrane

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Metal are highly ___________ ...?

(A) Electropositive
(B) Electronegativity

(C) Both of these
(D) Neutral

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What is the main component of bones and teeth...?

(A) Calcium carbonate
(B) Calcium phosphate

(C) Calcium sulphate
(D) Calcium nitrate

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Layer of atmosphere which separates stratosphere and troposphere is known as...?

(A) Tropo-pause
(B) Mesopause

(C) Stratopause
(D) Thermopause

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An atom has the same number of _____...?

(A) Electrons and Neutrons
(B) Protons and Neutrons

(C) Electrons and Protons
(D) Neutrons and Molecules

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In that the half of the Earth which is facing the sun, there is...?

(A) Day
(B) Night

(C) Winter
(D) Both A and B

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Wind energy is the __________ energy....?

(A) Potential
(B) Transverse

(C) Kinetic
(D) Mechanical

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__________ contains the ozone layer....?

(A) Troposphere
(B) Stratosphere

(C) Mesosphere
(D) Ionosphere

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Through which organ does a fish respire...?

(A) Nose
(B) Lungs

(C) Gills
(D) Fins

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The band of tough, fibrous, connective tissue which are attached to bone at joints called _____...?

(A) Ligament
(B) Tendon

(C) Bicep
(D) Tricep

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