251.
The pathway of water from soil upto the secondary xylem A
Soil → root hair → cortex → endodermis → percycle → protoxylem → Metaxylem
B
Metxylem → protoxylem → pericycle → cortex → endodermis → soil → root hair
C
Cortex → root hair → endodermis → pericycle → protoxylem → metaxylem
D
Pericycle → soil → root hair → cortex → endodermis → protoxylem → metaxylem
Answer :
Soil → root hair → cortex → endodermis → percycle → protoxylem → Metaxylem
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252.
What will happen if plant cells are placed in hypertonic solution A
Tyrgud
B
Plasmolysed
C
Deplasmolysed
D
Lysed
Answer :
Plasmolysed
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253.
Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (A-E) make it useful as a storage material? A
(B) and (C)
B
(B) and (D)
C
(A), (C) and (E)
D
(A) and (E)
Answer :
(B) and (D)
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254.
Leaves which appear wilted in the day time recover at night because A
Light is essential for photo synthesis
B
The stomata close down , temperature decrease, transpiration is reduced and the plant is able to absorb more form the soil
C
Respiration and translocation of organic substance both increases
D
The plant is sleeping because of dark conditions
Answer :
The stomata close down , temperature decrease, transpiration is reduced and the plant is able to absorb more form the soil
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255.
The following percentage of water absorbed by herbaceous plants is lost in transpiration A
80%
B
60%
C
40%
D
99%
Answer :
99%
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256.
Hydathodes open during A
Height hours
B
Day hours
C
Noon hours
D
Always open
Answer :
Always open
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257.
A root hair cell under ordinary conditions have a water potential in the range of A
-1 to -4 atm
B
-1 to +4 atm
C
-1 to 2 atm
D
-1 to 2 atm
Answer :
-1 to -4 atm
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258.
For chlorophyll formation a plant needs A
Fe, Ca & light
B
Fe, Mg& Light
C
A, K & light
D
Mn & Cu
Answer :
Fe, Mg& Light
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259.
Which of the following plants economises transpiration loss off water A
C3 - plants
B
C4 - plants
C
Both equally
D
C2 -plants
Answer :
C4 - plants
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260.
Under natural conditions the osmotic pressure is A
More than turgor pressure
B
Less than turgor pressure
C
Equal to turgor pressure
D
Zero
Answer :
More than turgor pressure
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