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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A man-made object developed to accomplish a certain task in space ____...?

(A) Spacecraft
(B) Space Station

(C) Satellite
(D) Telescope

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A process in which light rays falls on any material object and these rays bounce back is known as...?

(A) Reflection
(B) Refraction

(C) Diffusion
(D) Absorption

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Which is the hardest substance in the human body...?

(A) Tooth enamel
(B) Skull

(C) Knee cap
(D) Rib

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Tuberculosis is a _________ infection...?

(A) Viral
(B) Bacterial

(C) Fungal
(D) Parasitic

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Potassium meta-bisulphite is used as a food preservative for...?

(A) Squash
(B) Tomato Ketchup

(C) Fruit Juices
(D) Pickles

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Which of the following is not a part of Darwinism...?

(A) Over production
(B) Natural selection

(C) Inheritance for acquired characters
(D) Competition for survival

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Which metal is added to steel to make it stainless steel...?

(A) Chromium
(B) Aluminium

(C) Carbon
(D) Copper

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The speed of the sound in diamond is _____...?

(A) 6000 m/s
(B) 12000 m/s

(C) 9000 m/s
(D) 15000 m/s

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The gas heater gives us heat by __________...?

(A) Radiation
(B) Conduction

(C) Convection
(D) Environmental pressure

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