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Plant Water Relation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPlant Water Relation4 Marks
Question
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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Answer

Column AColumn B (New Terminology)
(1) D.P.D.(c) Water potential
(2) O.E(a) Osmotic potential
(3) T.P(b) Pressure potential

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Rohan, a 13 year old school student, has been diagnosed with AIDS. He often complains of fever, nausea, headache and lethargy. Doctor advised some drugs to prolong his life.
  1. What could be the most likely mode of transmission of disease to Rohan?
  1. Artificial insemination.
  2. Sexual intercourse with infected partner.
  3. Sexual intercourse with infected partner.
  4. Use of contaminated blade.
  1. Name the drug prescribed for treatment of this disease.
  1. Zidovudine.
  2. Taxol.
  3. Vinblastine.
  4. Both (a) and (c).
  1. Assertion: AIDS is an incurable STD.
Reason: AIDS virus attacks helper T-lymphocytes.
  1. Both assertion and reason are true, and reason is the correct explanation of assertion.
  2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
  3. Assertion is true, but reason is false.
  4. Both assertion and reason are false.
  1. AIDS cannot be diagnosed by:
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Haemophilia is a sex linked disease which is also known as bleeder's disease as the patient will continue to bleed even from a minor cut since he or she does not possess the natural phenomenon of blood clotting due to absence of anti -haemophilic globulin or factor VIII and plasma thromboplastin factor IX essential for it. As a result of continuous bleeding the patient may die of blood loss. Colour blindness is another type of sex linked trait in which the eye fails to distinguish red and green colours. Vision is however, not affected and the colour blind can, lead a normal life, reading, writing and driving (distinguishing traffic lights by their position).
  1. If a haemophilic man marries a woman whose father was haemcphihc and mother was normal then which of the following holds true for their progenies?
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  2. All the daughters are haemophilic.
  3. All sons are haemophilic and all daughters are normal.
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  1. A man whose father was colourblind and mother was normal marries a woman whose father was haemophilic and mother was normal. Which of the following is true for their progenies? [Note: Percentage is from the total number of progenies]
  1. $25 \%$ female progenies carry the gene for both haemophilia and colourblindness.
  2. $25 \%$ male progenies carry only the gene of colourblindness.
  3. $25 \%$ female progenies carry only the gene of colourblindness.
  4. $25 \%$ male progenies and 25% female progenies carry the gene of haemophilia.
  1. Which of the following statements is incorrect regarding haemophilia?
  1. It is a dominant disease.
  2. A single protein involved in clotting of blood is affected.
  3. It is recessive disease.
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  1. $100 \%$
  2. $50 \%$
  3. $25 \%$
  4. $0 \%$
  1. Refer to the given cross?


Select the correct option regarding $1, 2, 3$ and $4$.
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  2. Colourblind haemophilic female.
  3. Normal male.
  4. Haemophilic male
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  2. Haemophilic female.
  3. Normal male
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  2. Colourblind and haemophilic female
  3. Normal male
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A technique known as amniocentesis is used to determine fetal abnormalities. This test chromosomal pattern in amniotic fluid. However, this technique is legally banned now.
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S. No
X
Y
(a)
Amnion
Chorion
(b)
Uterine wall
Placenta
(c)
Placenta
Uterine wall
(d)
Uterine wall
Amnion
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  2. Z is yolk sac which functions as site of early blood cell formation.
  3. Z is amnion, which takes part in placenta formation.
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  4. Cystic fibrosis.
  1. Assertion: Amniocentesis is legally banned for sex determination.
Reason: Amniocentesis was being misused for aborting normal female fetus.
  1. Both assertion and reason are true, and reason is the correct explanation of assertion.
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  3. Assertion is true, but reason is false.
  4. Both assertion and reason are false.
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  1. Which of the following equations correctly represents the exponential population growth curve?
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  2. $\text{dN}/\text{dt}=\frac{\text{rN}}{\text{K}}$
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  3. Synergid and male gamete.
  4. A male gamete and antipodals.
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  1. Part 'P' supplies nutrition to the developing embryo.
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  3. Part 'R' is the protective sheath of shoot apex and leaf primordia.
  4. The embryo shown in the diagram is present in members of Family Poaceae.
  1. (IV) only.
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  3. (I) and (IV) only.
  4. (I), (II), (III) and (IV).
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  2. The part of embryonal axis above the level of cotyledons is epicotyl, while the part below the level of cotyledons is hypocotyl.
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  1. (I) and (II).
  2. (II) and (III).
  3. (I) and (III).
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  1. Hypocotyl.
  2. Epicotyl.
  3. Radicle.
  4. Plumule.
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Study the two cases carefully regarding the pattern of inheritance of disease.
Case
Mother
Father
Children
Case I
With disease
Normal
Sons always with diseases
Case II
With disease
Normal
Sons and daughters could show disease
  1. Which of the following diseases is not an example of case I?
  1. Haemophilia.
  2. Colour blindness.
  3. Aa, AA, Aa, Aa, aa
  4. Night blindness.
  1. Which of the following is impossible for a case I?
  1. Carrier mother to pass the gene to her son.
  2. Diseased father to pass the gene to his daughter.
  3. Diseased father to pass the gene to his son.
  4. Carrier mother to pass the gene to her daughter.
  1. If inheritance pattern of disease is as case II and both parents are carrier of disease what are the chances of pregnancy resulting in an affected child?
  1. 25%
  2. 100%
  3. 0%
  4. 50%
  1. Disease that follows inheritance pattern as case I is linked with?
  1. Autosomes.
  2. X chromosome.
  3. Y chromosome
  4. Chromosome 21.
  1. Study the given pedigree chart showing the inheritance pattern as case II.


Study the given pedigree chart showing the inheritance pattern as case II.
  1. Aa, aa, aa, AA, aa
  2. Aa, aa, Aa, AA, Aa
  3. Aa, Aa, aa, AA, AA
  4. Aa, AA, Aa, Aa, aa
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