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Biology Test 9 (Part - I)

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Photolysis of water is associated with

  1. PS I

  2. PS II

  3. Cyt. b

  4. Quinone


Correct Option: B

Hydroponics are cultures of plant in

  1. soil

  2. soil - less condition

  3. light

  4. nutrients


Correct Option: B

Rate of translocation of photosynthesis in sieve tubes is

  1. 3-5 mm/hour

  2. 3-5 cm/hour

  3. 13-15 cm/hour

  4. 50-100 cm/hour


Correct Option: D

The most common thing which can respire in the absence of oxygen is

  1. fish

  2. yeast

  3. potato

  4. chlorella


Correct Option: B

Soil salinity is measured by

  1. porometer

  2. potometer

  3. conductivity meter

  4. calorimeter


Correct Option: C

Quantosomes contain

  1. 200 chlorophyll molecules

  2. 230 chlorophyll molecules

  3. 250 chlorophyll molecules

  4. 300 chlorophyll molecules


Correct Option: C

Deplasmolysis in a cell occurs when it is dipped in a

  1. hypotonic solution

  2. isotonic solution

  3. hypertonic solution

  4. none of the above


Correct Option: A

Plasma membrane controls

  1. passage of water only

  2. passage of water and solutes in and out of the cell

  3. passage of water and solutes into the cell

  4. movement of cell contents out of the cell


Correct Option: B

Starch-sugar conversion hypothesis of the stomatal opening was proposed by

  1. Levitt

  2. Sayre & Steward

  3. Sachs

  4. Emerson


Correct Option: B

The plant ash is an indication of

  1. mineral salts absorbed by the plant

  2. organic matter of the plant

  3. both the mineral salts and organic matter

  4. none of the above


Correct Option: A

Dieback disease of citrus is caused by

  1. virus

  2. fungus

  3. bacterium

  4. copper deficiency


Correct Option: D

Maximum transpiration occurs from

  1. dermal tissue

  2. ground tissues of scale leaves

  3. periderm and lenticels

  4. protoderm and procambium


Correct Option: A

Chlorosis occurs due to the

  1. deficiency of light

  2. deficiency of Mg and Fe

  3. deficiency of pigments in the soil

  4. increased illumination


Correct Option: B

In the process of plasmolysis

  1. endosmosis occurs

  2. ex-osmosis occurs

  3. imbibition occurs

  4. diffusion occurs


Correct Option: B

The most common ion present in the cell is

  1. phosphorus

  2. potassium

  3. iron

  4. sulphur


Correct Option: B

Root pressure in a plant is measured by

  1. potometer

  2. manometer

  3. thermometer

  4. barometer


Correct Option: B

Most widely accepted explanation for the ascent of sap in plant is

  1. capillarity / Imbibition

  2. pulsating activity of living cells

  3. role of atmospheric pressure

  4. transpiration-cohesion theory


Correct Option: D

Semipermeable membrane allows the diffusion of

  1. solutes

  2. solvents

  3. both solvents and solute

  4. none of the above


Correct Option: B

Photorespiration is favoured by

  1. low O2 and high CO2

  2. low light and high O2

  3. high O2 and low CO2

  4. low temperature and high CO2


Correct Option: C

Osmotic pressure is the highest in

  1. Xerophytes

  2. Lithophytes

  3. Halphytes

  4. Mesophytes


Correct Option: B

The real force causing entry of water into a cell from other cell is

  1. diffusion pressure deficit

  2. turgor pressure

  3. osmotic pressure

  4. wall pressure


Correct Option: A

Presence of phosphorus in a plant

  1. brings out healthy root growth

  2. promotes fruit ripening

  3. retards protein formation

  4. none of the above


Correct Option: A

Alga used by Calvin and his co-workers in their experiments on photosynthesis is

  1. Chlamydomonas

  2. Chlorella

  3. Chara

  4. Euglena


Correct Option: B

Suitable temperature for absorption of water by roots is

  1. 40-45؛C

  2. 10-15؛C

  3. 20-35؛C

  4. None of these


Correct Option: C

In water-logged soil, plants do not grow properly

  1. because the soil is physiologically dry

  2. because the soil is physiologically wet

  3. due to excessive water

  4. due to shortage of water


Correct Option: A
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