Plant Physiology: Biology Entrance

                  

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Q.1.  Root hairs do not play a role in 

A) water uptake 

B) oxygen uptake 

C) carbon dioxide uptake 

D) mineral uptake 

Q.2.  Decreased rate of photosynthesis at high concentration  of oxygen is referred to as 

A) Pasteur effect

B) Emerson effect

C) Warburg effect

D) Richmond - Lang effect 

Q.3.  Which of the following is not part of the transpiration cohesion - adhesion theory of the ascent of xylem sap ? 

A) The evaporation of water from the mesophyll cells , which initiates a pull of water molecules from neighboring cells and eventually from the tracheid's 

B) The transfer of this pull from one water molecule to the next due to the cohesion caused by hydrogen bonds 

C) The hydrophilic walls of the narrow tracheid's and vessels that help to maintain the column of water against the force of gravity 

D) The use of proton pumps to create membrane potentials that facilitate the accumulation of mineral ions 

Q.4.  The productivity of crop begins to decline when the leaves begin to wilt mainly because 

A) flaccid mesophyll cells are incapable of photosynthesis 

B) stomata close , preventing CO from entering the leaf 

C) photolysis , the water splitting step of photosynthesis , cannot occur when there is a water deficiency 

D) accumulation of CO in the leaf inhibits enzymes required from photosynthesis 

Q.5.  The ion involved in stomata movement is 

A) Zn

B) Mg

C) Mn

D) K 

Q.6.  Which of the following is a correct statement about nitrogen fixation ?

A) Plants convert atmospheric nitrogen to ammonia 

B) Ammonia is converted to nitrates , which is the part of nitrogen most easily absorbed by plants 

C) Mutant strains of Rhizobium are able to secrete excess nitrogen into the soil 

D) Enzyme nitrogenase reduces N to from ammonia 

Q.7.  Which of the following is a correct statement about nitrogen fixation ?

A) Plants convert atmospheric nitrogen to ammonia 

B) Ammonia is converted to nitrates , which is the part of nitrogen most easily absorbed by plants 

C) Mutant strains of Rhizobium are able to secrete excess nitrogen into the soil 

D) Enzyme nitrogenase reduces N to from ammonia 

Q.8.  The principal cation in alkaline soil is 

A) Na

B) K

C) Ca 

D) H 

Q.9.  Sulphur is an important nutrient for optimum growth and productivity in 

A) Pulse crops 

B) Cereals 

C) Fiber crops 

D) Oilseed crops 

Q.10.  Which of the following nutrients is incorrectly paired with its function in a plant ?

A) Calcium - formation of cell walls , combines with pectin to glue cells together 

B) Magnesium - constituent of chlorophyll , cofactor for important enzymes 

C) Iron - component of chlorophyll 

D) Potassium - important in osmotic regulations , cofactor 

Matrices And Determinant: Mathematics

 

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Q.1. If  

A) 6

B) 16

C) 10

D) -6

Explanation-

 

Q.2. If A= 

A) 

B) 

C) 

D)  

Explanation-

 

Q.3. If the matrix   is singular, then  =

A) 3

B) -5

C) 4

D) 2

Explanation-

The matrix A= is singular  |A|=0

 

Q.4. If   is a cube root of unity and A= 

A) 

B) 

C) 

D)  

Q.5. If A= then  is 

A) A null matrix 

B) A unit matrix

C) a symmetric matrix 

D) 2A

Explanation-

 

Q.6. If F(a)= and G()= then   

A) 

B) 

C) 

D)  

Explanation-

Since  

Q.7. let A= be a square matrix and let  be the cofactor of  in A. If C= then 

A) 

B) 

C) 

D) None of these

Q.8. If A',B' are transpose matrices of the square matrices A,B respectively, then (AB)'=

A) A'B'

B) B'A'

C) B'A

D) A'B

Q.9. The factors of  , are

A) x - a, x - b and x + a + b

B) x + a, x + b and x + a + b

C) x + a, x + b and x - a - b

D) x - a, x - b and x - a - b

Q.10. If A is non-singular and (A - 2I) (A - 4I) = O, then  

A) I

B) O

C) 2I

D) 6I

Explanation-

We have,