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BIOLOGY 2 Marks Questions

Model Paper 3 · Gujarat Board (GSEB) STD 12 Science (GSEB - English Medium). 12 questions.

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2 Marks Questions

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12 questions · timed · auto-graded

Question 82 Marks
There is only one possible sequence of amino acids when deduced from a given nucleotides. But multiple nucleotide sequence can be deduced from a single amino acid sequence. Explain this phenomena.
Answer
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Question 92 Marks
In peas, tallness is dominant over dwarfness, and red colour of flower is dominant over the white flower colour. When a tall plant bearing-red flower was pollinated with a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny-in numbers mentioned against them.
Tall, red 138, Tall, white = 132, Dwarf, red = 136, Dwarf, white = 128.
Mention the genotypes of the two parents and of the four offsprings types.
Answer
self
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Question 102 Marks
What are the conditions in which medical termination of pregnancy is advised?
Answer
Intentional or voluntary termination of pregnancy before full term is called medical termination of pregnancy (MTP) or induced absortion.
$\rightarrow$ MTPs are considered relatively safe during the first trimester, i.e. upto 12 weeks of pregnancy. Second trimester absortions are much more riskier.
$\rightarrow$ For the following aspects MTP is advisable. (i) Frequently, if the factors is found to be female, it is followed by MTP this is totally against what is legal such practices should be avoided because these are dangerous both the young mother and foetus.
$\rightarrow$ Effective counseling on the need to avoid unprotected coitus and risk factors involved in illegal abortions as well as providing more health care facilities could reverse the mentioned unhealthy trend.
$\rightarrow$ MTP generally get rid of unwanted pregnancies either due to casual unprotected intercourse or failure of the contraceptive used during coitus or rapes.
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Question 112 Marks
Why does the zygote begin to divide only after the division of primary endosperm cell (PEC) ?
Answer
The zygote needs nourishment during its development. As the mature fertilised embryo sac offers very little nourishment to the zygote, the primary endosperm cell (PEC) divides and generates the endosperm tissue which nourishes the zygote.
$\rightarrow$ Hence, the zygote always divides after division of PEC (Primary Endosperm Cell).
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Question 122 Marks
Describe internal structure of microsporangiums.
Answer
Structure of microsporangiums : In a transverse section, a typical microsporangiums neat circular is outline.
$\rightarrow$ It's generally surrounded by four wall layers - the epidermis, endothecium, middle layers and tapetums.
$\rightarrow$ The outer three wall layers perform the fraction of protection and help in dehiscence of anther to release the pollen.
$\rightarrow$ The innermost wall layer is the tapetum.
$\rightarrow$ It nourishes the developing pollen grain.
$\rightarrow$ Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.
$\rightarrow$ When the anther is young, a group of compactly arranged homogenous cells called the sporogenous tissue occupies the centre of each microsporangiums.
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2 Marks Questions - BIOLOGY STD 12 Science Questions - Vidyadip