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Plant Water Relation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPlant Water Relation4 Marks
Question
Column A (Scientist)Column B (Theory)
(1) Dixon and Joly(a) Starch-sugar inter conversion
(2) Steward(b) Osmotic absorption theory
(3) Atkins and Pristley(c) Non-osmotic absorption theory
(4) Kramer and Thimann(d) Cohesion tension theory
✓

Answer

Column A (Scientist)Column B (Theory)
(1) Dixon and Joly(d) Cohesion tension theory
(2) Steward(a) Starch-sugar inter conversion
(3) Atkins and Pristley(b) Osmotic absorption theory
(4) Kramer and Thimann(c) Non-osmotic absorption theory

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According to Mendel, one gene control the expression of one character only. The ability of a gene to have multiple phenotypic effect because it influences a number of characters is an exception. The gene having a multiple phenotypic effect because of its ability to control of two or more characters can be seen in cotton. In cotton, a gene for the lint also influences the height of plant, size of the ball, number of ovules and viability of seeds.
  1. Genes with multiple phenotypic effects are known as?
  1. Hydrostatic genes.
  2. Duplicate genes.
  3. Pleiotropic genes.
  4. Complimentary genes.
  1. Which of the following disorder is an example of genes with multiple phenotypic effects?
  1. Phenylketonuria.
  2. Haemophilia.
  3. Sickle cell anaemia.
  4. Both (a) and (c)
  1. Which of the following is an example of gene with multiple phenotypic effect?
  1. Drosophila white eye mutation.
  2. Kernel colour in wheat.
  3. Height in human beings.
  4. Skin colour in human beings.
  1. Which of the following statements is not correct regarding genes with multiple phenotypic effect?
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  2. Occasionally a number of related changes are caused by a gene.
  3. It occurs due to effect of the gene on two or more inter-related metabolic pathways.
  4. None of these.
  1. Assertion: ln garden pea, the gene which controls the flower colour also controls the colour of the seed coat and presence of red spots in the leaf axils.
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Distinguish between: m-RNA, t-RNA and r-RNA.
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Distinguish between : Extero and entero receptors.
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Read the following and answer any four questions from (i) to (v) given below:
Embryo develops at the micropylar end of the embryo sac, where the zygote is situated. Most zygotes divided only after certain amount of endosperm is formed. The early stages of embryo development are similar in both monocotyledons and dicotyledons. The zygote gives rise to the proembryo and subsequently to the globular heart-shaped and mature embryo. A typical dicotyledonous embryo consists of an embryonal axis and two cotyledons. Embryo of monocotyledons possess only one cotyledon.
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  2. An egg cell and a male gamete.
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  4. A male gamete and antipodals.
  1. Refer to the given diagram of the embryo of an angiospermous plant with parts labelled P, Q and R. Select the correct statement(s) regarding this.
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  2. Part 'Q' is the protective sheath of radicle and root cap.
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  1. (IV) only.
  2. (II) and (III) only.
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  3. (I) and (III).
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Rama lives in a society where a robbery occurred last night. Robbers came into the flat and murdered the old lady residing there. Police came and restricted the entry into the flat. They took samples from the room, where the dead body was found. While examining, they found that there is some blood and tissue in the nails of old lady. According to their observation, police filtered out their inspection to three suspects viz. servant, cook and milkman. Finally after two days of robbery, police caught the criminal. It was the old lady's cook. Rama was amazed to see that how quickly police completed and shut the case. She asked the inspector that how they did it? The police man told her that it become possible due to the sample collected from the victim, that lead them to the criminal. TI1e sample taken from nail scraping was amplified using PCR and then tested.
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  2. $25^\circ$
  3. $95^\circ $
  4. $40^\circ $
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Cross pollination is the transfer of pollen grains from the anther of a one flower to the stigma of a genetically different flower. It is performed with the help of an external agency which may be abiotic (e.g., wind, water) or biotic (e.g., insects, birds, bats, snails). The diagram shows the carpel of an insect pollinated flower.
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Regular change in temperature that occurs at specific intervals of time is called thennoperiodicity. It is of two types-diurnal and seasonal thermoperiodicity. Diumal periodicity refers to temperatures of day and night. It determines periods ofannual activity. In season periodicity different temperature prevails in different seasons of the year. 'Tiley favour different aspects of plant and animal life termed as phenology. For example in wheat, leaf growth requires a temperature of 10º-25ºC. Apple requires temperature below 7ºC for a period of 800 hrs before flowering and fruiting can occur. Low temperature is required for germination of some seeds as well as flowering in some plants. It also determines growth, reproduction, colour and morphology of animals. Both low and high temperature cause stress in organisms which is overcome by particular adaptations.
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Read the following and answer any four questions from $2(i)$ to $2(v)$ given below: Restriction endonuclease was isolated for the first ti me by W. Arb er in $1962$ in bacteria. Restriction endonucleases cut the DNA duplex at specific points therefore they are also called as molecular scissors or biological scissors. Three types of restriction endonucleases are Type I, Type II and Type III but only Type II restriction endonucleases are used in recombinant DNA technology. Restriction endonuclease EcoR I recognises the base sequence GAATTC in DNA duplex and cut strands between G and A.
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  3. $Na^{2+}$​​​​​​​ ions
  4. $K^{2+}$​​​​​​​ ions
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  2. Animal cell.
  3. Prokaryotic cell.
  4. Genninal cell.
  1. Restriction endonucleases are also called as molecular or biological scissors because,
  1. They cleave base pairs of DNA only at their terminal ends.
  2. They cleave one or both the strands of DNA.
  3. They act only on single stranded DNA.
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  1. $\ \ \ \ \ \ \ \ \ \ \ \ \downarrow\\5'-\text{GAATTC}-3'\\3'-\text{CTTAAG}-5'\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \uparrow$
  2. $ \ \ \ \ \ \ \ \ \ \ \downarrow\\5'-\text{GAATTC}-3'\\3'-\text{CTTAAG}-5'\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \uparrow$
  3. $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \downarrow\\5'-\text{GAATTC}-3'\\3'-\text{CTTAAG}-5'\\\ \ \ \ \ \ \ \ \ \uparrow$
  4. $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \downarrow\\5'-\text{GAATTC}-3'\\3'-\text{CTTAAG}-5'\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \uparrow$
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Column A (Scientist)Column B (Theory)
(1) Munch(a) Proton transport theory
(2) Bohem(b) Pressure flow theory
(3) J. Pristley(c) Capillary theory
(4) Levitt(d) Root Pressure theory
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Column AColumn B (New Terminology)
(1) D.P.D.(a) Osmotic potential
(2) O.E(b) Pressure potential
(3) T.P(c) Water potential
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