the matter is one that can be settled by observation, make
the observation yourself. Aristotle could have avoided the mistake of
thinking that women have fewer teeth than men, by the simple device
of asking Mrs Aristotle to keep her mouth open while he counted. He
did not do so because he thought he knew. Thinking that you know
when in fact you don't is a fatal mistake, to which we are all prone. I
believe myself that hedgehogs eat black beetles, because I have been
told that they do; but if I were writing a book on the habits of
hedgehogs, I should not commit myself until I had seen one enjoying
this unappetizing diet. Aristotle, however, was less cautious....
Many matters, however, are less easily brought to the test of
experience. If, like most of mankind, you have passionate convictions
on many such matters, there are ways in which you can make yourself
aware of your own bias
B2.What does Aristotle's erroneous notion convey to you?
02
02
B3.Give verb form of:
i) Observation :-
ii) Conviction :-
02
B4.1)I believe myself that hedgehogs eat black beetles,
dette he tenseWY
TI
44. In arithmetic growth rate, when length of the organ is
plotted against time, the nature of graph curve will be
(a) linear
(b) sigmoidal
(c) parabolic
(d) hyperbolic
45. The measure of the ability of the plant to produce new
plant material is referred as -
(1) efficiency index (b) obsolute growth rate
(c) arithmetic growth (a) linear growth
46. In which of the following process, the cell loose their
protoplasm to form trachenry element?
(a) Dedifferentiation (b) Redifferentiation
(c) Differentiation
(d) Plasticity
47. The ability of plant to follow different pathways and
produce different structures in response to environment
and phases of life is termed as
(a) elasticity
(b) growth efficiency
(c) plasticity
(d) heterophylly
48. Which one of the following is chemically identical to
ABA?
(a) Indole-3-acetic acid (b) Kinetin
(c) Dormin
(d) 2, 4-D
49. The hormones which was first isolated from human urine
is.
(a) indole-3-acetic acid (b) gibberellin
(c) ethylene
(d) kinetin
50. Which of the following is not an influence of auxins?
(a) Apical dominance (b) Parthenocarpy
(C) Phototropism
(d) Fruit ripening
51. Mendel's last lawis
(a) segregation
(b) dominance
(c) independent assortment
(d) polygenic inheritance
52. The contrasting pairs of factors in Mendelian crosses are
called
(a) multiple alleles
(6) alleles
(c) alloloci
(d) paramorphs
53. The ratio of phenotypes in F, of a monohybrid cross is
(a) 3:1
(b) 1:2:1
(c) 9:3:3:1
(d) 2:1
54. Which of the following crosses will give tall and dwarf
pea plants in same proportions?
(a) TTXU
(b) Ttxit
(c) TT X Tt
(d) Itxit
55. A pure tall pea was crossed with a pure dwarf'pea, All the
plants of F, were found to be tall. This is due to
(a) law of dominance,
(b) disappearance of factor for dwarfness in F,
generation
(c) segregation of factors,
(d) co-ordination
56. The F, generation of a cross produced identical
phenotypic and genotypic ratio. It is not an expected
Mendelian result, and can be attributed to
(a) independent assortment
(b) linkage
(c) incomplete dominance
(d) none of the above
57. The monohylorid genotypic ratio : 211 inleneration
indicates
(6) segregation
(b) Independent assortment
(c) dominance
(d) Incomplete dominance
58. Mendel selected pea as material for his experiments
because
(A) it is an annual plant with comparatively short life
cycle,
(b) the flowers are sell-pollinated,
(c) the number of seeds produced is quite large,
(d) all of the above.
59. Which of the following crosses would produce a
genotyple ratio of 1:2:1 in F',?
(a) ABXAB
(b) Abxab
(C) Abx AB
(d) ab xab
60. Punnett square is used to know the
(9) outcome of a Cross
(b) probable result of a cross
(c) types of gametes
(d) result of meiosis
61. The two strands of DNA are held together ty
(a) peptide bonds (b) phosphodiester bonds
(c) hydrogen bonds (d) S- S bonds
62. Nucleotide arrangement in DNA can be seen by
(1) X-ray crystallography
(b) electron microscope
(c) ultracentrifuge
(d) light microscope
63. Chargaff's rules are applicable to
() singte stranded RNA,
(b) single stranded DNA and RNA,
(c) Single stranded DNA.
(d) double stranded DNA.
Answers
Answer:
an object is kept at a distance of 10cm from a convex mirror whose focal length is 15cm . find the position, nature and magnificationAnswer :-
(•) Image distance = 30 cm
(•) Nature is virtual and erect.
(•) magnification = 0.6
To Find :-
→ Position of image ,nature and magnification.
Explanation :-
Given that ,
Focal length (f) = 15 cm
object distance (u) = -10 cm ( left )
image distance (v) = ?
magnification (m) = ?
Apply mirror formula
\begin{gathered} \implies \boxed{ \sf{ \frac{1}{f} = \frac{1}{v} + \frac{1}{u} }} \\ \therefore \: \\ \\ \implies \sf{ \frac{1}{ 15} = \frac{1}{v} + \frac{1}{ - 10} } \\ \\ \implies \sf{\frac{1}{v} = \frac{1}{10} + \frac{1}{15} } \\ \\ \implies \sf{ \frac{1}{v} = \frac{3 + 2}{30} } \\ \\ \implies \sf{ \frac{1}{v} = \frac{5}{30} } \\ \\ \implies \boxed{ \sf{v(image \: distance) = 6 \: cm \: }}\end{gathered}
⟹
f
1
=
v
1
+
u
1
∴
⟹
15
1
=
v
1
+
−10
1
⟹
v
1
=
10
1
+
15
1
⟹
v
1
=
30
3+2
⟹
v
1
=
30
5
⟹
v(imagedistance)=6cm
Nature :-
→ Because v is positive hence image is erect and virtual .
Magnification :-
We know that ;
\begin{gathered} \to \sf{magnification \: = \frac{ - v}{u} = \frac{ - 6}{-10} } \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 0.6 \: \end{gathered}
→magnification=
u
−v
=
−10
−6
=0.6
We know that magnification for a convex mirror is less then 1 .
Answer:-
b2) Aristotle had the erroneous notion that women had fewer teeth than men, when in fact he didn't verily it. His example conveys to us that we must be cautious. We must not think that we know something for sure till we make the observation ourselves. ... Thinking that you know when in fact you don't is a fatal mistake
b3)a. Observing. b.Convicting