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NEET Practice Questions (MCQs) with Answers & Solutions

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All Physics Chemistry Botany Zoology

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Water potential is equal to (CBSE 1988, AMV 1997)

Ψ _S + OP

Ψ _S = TP

Ψ _P + Ψ _W

Ψ _P + Ψ _s

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Purple cabbage leaves do not pass out colour in cold water but do so in hot water because (AFMC 1988)

A. Hot water enters the cell faster B. Pigment is not soluble incold water C. Hot water destroys cellwalls D. Hot water kills plasmalemma and makes it permeable

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rivet poppet hypothesis is used to explain

stability of rivets

stability of viruses in humans

stability of hydrogen bonds in dna

stability of a biological community

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Explanation

factual

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Wilting in plants occurs when (CPMT 1987, 1991, 2002, AFMC 2005, BHU 2006, WB 2008)

A. Phloem is blocked B. Xylem is removed / blocked C. Pith is removed D. A few leaves are removed

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Stomata open during daytime because the guard cells (CPMT 1987)

A. Produce osmotically active sugars or organic acids B. Are thin walled C. Are bean shaped D. Have to help in gaseous exchange

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Potometer is an instrument that measures (Pb. PMT 1998, Manipur 2005)

A. Respiration B. Photosynthesis C. Growth D. Transpiration

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Rate of transpiration is reduced with (CPMT 1987, MPPMT 1999)

A. Rise in temperature B. Decrease in light intensity C. Increase in wind velocity D. Increase in water uptake

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In guard cells when sugar is converted into starch, the stomatal pore (CBSE 1997)

A. Closed completely B. Opens partially C. Opens fully D. Remains unchanged

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Root hairs occur in the zone of (Kerala 2003)

A. Cell division B. Cell elongation C. Cell maturation D. Mature cells

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Path of water movement from soil to xylem is (CPMT 1989, Kerala 2008)

A. Meta xylem- protoxylem - cortex - soil â€“ root hair B. Cortex - root hair - endodermis - pericycle - protoxylem- meta xylem C. Soil - root hair - cortex - endodermis - pericycle - protoxylem - meta xylem D. Pericycle - soil - root hair - cortex endodermis - protoxylem- metaxylem

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