81
Producing an orienting response in relation to some environmental response so that the organism gets itself into favourable conditions is known as
A)
Masking effect
B)
Directive effect
C)
Controlling effect
D)
Lethal effect
Answer & Solution
Answer: Option
B
82
Assertion (A) Leguminous plants are nitrogen fixers.Reason (R) Leguminous plants have Rhizobium in their root nodules.
A)
Both A and R are true and R is the correct explanation of A
B)
Both A and R are true, but R is not the correct explanation of A
C)
A is true, but R is false
D)
A is false, but R is true
Answer & Solution
Answer: Option
A
83
Match
List-I (Embryo types) with
List-II (Contributions of proembryonal cells) and select the correct answer:
List-I List-II
a. Onagrad type
1. The basal and terminal cells, both contribute to the development of the embryo
b. Solanad type
2. The basal cell undergoes no further division and the suspensor, if present, is always derived from the terminal cell
c. Asterad type
3. The basal cell plays only a minor role or none in the subsequent development of the embryo
d. Caryophyllad type
4. The basal cell usually forms a suspensor of two or more cells
A)
a-2, b-4, c-1, d-3
B)
a-3, b-1, c-4, d-2
C)
a-3, b-4, c-1, d-2
D)
a-2, b-1, c-4, d-3
Answer & Solution
Answer: Option
C
84
The in vivo synthesis of the purine ring of cytokinin takes place on
A)
Deoxyribose phosphate
B)
Ribose phosphate
C)
Ribulose diphosphate
D)
None of the above
Answer & Solution
Answer: Option
B
85
The examples of hypogeal germination are the seeds of
A)
Bean, gourd and castor
B)
Gourd, castor and cotton
C)
Pea, mango and cotton
D)
Pea, mango and groundnut
Answer & Solution
Answer: Option
D
86
A mixture of the cytokinin 6-benzyladenine and GA4 and GA7 forms
A)
Hydrazine
B)
Promalin
C)
Erythrene
D)
Gibberellin
Answer & Solution
Answer: Option
B
87
The term taiga is applied to the
A)
Eastern range of coniferous forests
B)
Northern range of coniferous forests
C)
Southern range of monsoon forests
D)
Northern range of deciduous forests
Answer & Solution
Answer: Option
B
88
According to Addicott and Lynch, the most important factor controlling abscission is the condition of the
A)
Auxin gradient against the abscission zone
B)
Senescence of the leaf
C)
Growth of that particular organ
D)
Number of leaves in the plant
Answer & Solution
Answer: Option
A
89
Which of the following is capable of reversing the light-break effect of red light?
A)
Far-red radiation
B)
Ultraviolet radiation
C)
Red light itself
D)
All of the above
Answer & Solution
Answer: Option
A
90
Match
List-I (Species) with
List-II (Specialised epiphytic characters) and select the correct answer:
List-I List-II
a. Ficus ramentaceae
1. Rootless
b. Asplenium nidus
2. Almost entirely green roots
c. Tillandsia usneoides
3. Coracious and thick leaves
d. Polyrrhiza funalis
4. Pocket leaves
A)
a-1, b-3, c-2, d-4
B)
a-3, b-2, c-4, d-1
C)
a-3, b-4, c-1, d-2
D)
a-2, b-1, c-3, d-4
Answer & Solution
Answer: Option
C
