Question 12 Marks
Explain sexual deceit and pseudocopulates.
Answer
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Question 22 Marks
Explain the ethical argument for biodiversity.
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Question 32 Marks
Discuss one example, based on your day-to-day observations, showing how loss of one species may lead to the extinction of another.
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Question 42 Marks
Is an aquarium a complete ecosystem ?
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Question 52 Marks
If a fresh water fish is placed in an aquarium containing sea water, will the fish be able to survive? Explain giving
reasons .
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Question 62 Marks
What is sewage? Where it passes before. excretion in water?
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Question 72 Marks
Do you consider passive smoking is more dangerous than active smoking? Why?
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Question 82 Marks
Who revealed biochemical nature of transforming principle? How was it done?
Answer
View full question & answer→Prior to the work of Osward Avery, Colin Macleod and Maclyn McCarty (1933- 44), the genetic material was though to be protein. They worked to determine the biochemical nature of 'transforming principle' in Griffith's experiment.
$\rightarrow$ The purified biochemical (proteins, DNA, RNA etc.) from the heat killed scells to see which ones could transform live R cells into cells.
$\rightarrow$ They discovered that DNA alone from S bacteria caused R bacteria to become transformed.
$\rightarrow$ They also discovered that protein - digesting enzymes (proteases) and RNA digesting enzymes (RNAases) did not affect transformation, so the transforming substance was not a protein or RNA.
$\rightarrow$ Digestion with DNAase did inhibit transformation, suggesting that the DNA caused the transformations.
$\rightarrow$ They calculated that DNA is the hereditary material.
$\rightarrow$ The purified biochemical (proteins, DNA, RNA etc.) from the heat killed scells to see which ones could transform live R cells into cells.
$\rightarrow$ They discovered that DNA alone from S bacteria caused R bacteria to become transformed.
$\rightarrow$ They also discovered that protein - digesting enzymes (proteases) and RNA digesting enzymes (RNAases) did not affect transformation, so the transforming substance was not a protein or RNA.
$\rightarrow$ Digestion with DNAase did inhibit transformation, suggesting that the DNA caused the transformations.
$\rightarrow$ They calculated that DNA is the hereditary material.
Question 92 Marks
Can a child have blood group 0 if his parents have, blood group 'A' and 'B'? Explain.
Answer
View full question & answer→Blood group of child is 'O' will be in following case.
(1) When father is $\text I$Ai and mother is $\text {I}$Bi.
In progeny possible blood is as follows ex. AB, A, B and O.
(2) If father having $\text {I}$Bi (B group) and mother having A group of $\text I$Ai in this way blood group of child have 'O' blood group. While parents have heterozygous factors 'A' and 'b" for that this 'O' type of child can get.
(1) When father is $\text I$Ai and mother is $\text {I}$Bi.
In progeny possible blood is as follows ex. AB, A, B and O.
(2) If father having $\text {I}$Bi (B group) and mother having A group of $\text I$Ai in this way blood group of child have 'O' blood group. While parents have heterozygous factors 'A' and 'b" for that this 'O' type of child can get.
Question 102 Marks
The procedure of GIFT involves the transfer of female gamete to the fallopia tube can gametes be transferred to the uterus to achieve the same result? Explain
Answer
View full question & answer→The uterine environment in not cogenial for the survivial of the gamete. If, directly transferred to the uterus they will undergo degeneration or could be phagocytosed and hence viable zygote would not be formed.
Question 112 Marks
In an artificial hybridisations programme observed events as follows. Rearrange them in collect series as per hysridisation programme.
(a) Re bagging
(b) Choose parents
(c) Bagging
(d) spread pollen on stigma
(e) Emasculation
(f) collect pollen from male parental plant
(a) Re bagging
(b) Choose parents
(c) Bagging
(d) spread pollen on stigma
(e) Emasculation
(f) collect pollen from male parental plant
Answer
View full question & answer→Correct sequential order of an artificial hybridization is as follows :
(b) selection of parents (e) emasculation (c) bagging (f) collection of pollen from male percent (d) dusting the pollen on stigma and (a) re-bagging.
(b) selection of parents (e) emasculation (c) bagging (f) collection of pollen from male percent (d) dusting the pollen on stigma and (a) re-bagging.
Question 122 Marks
Describe about floral organs (Diagram is not necessary).
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