Question
Column AColumn B
(1) Organism(a) Large unit with specific climatic zone
(2) Population(b) Different species in particular area
(3) Community(c) Same species in a geographical area
(4) Biome(d) Basic unit of ecological hierarchy

Answer

Column AColumn B
(1) Organism(d) Basic unit of ecological hierarchy
(2) Population(c) Same species in a geographical area
(3) Community(b) Different species in particular area
(4) Biome(a) Large unit with specific climatic zone

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Explain how does trisomy of 21st chromosome occur in humans. List any four characteristic features in an individual suffering from it.
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Study the given table and answer the questions based on it.
 
Hormone
Source
Function
(A)
Oxytocin
W
Ejection of milk
(B)
X
Anterior lobe of pituitary gland
Stimulates secretion of ABP from Sertoli cells
(C)
Y
Placenta
Maintains corpus luteum to secrete progesterone
(D)
Relaxin
Ovary
Z
  1. Identify the hormones X and Y, respectively.
  1. Testosterone, FSH.
  2. LH, hPL.
  3. FSH, hCG.
  4. ICSH, hCG.
  1. W in the given table is:
  1. Hypothalamus.
  2. Posterior lobe of pituitary.
  3. Placenta.
  4. Ovary.
  1. Which of the following is correct for Z?
  1. Dilation of uterine cervix during labour pains.
  2. Stimulates the growth of the mammary glands during pregnancy.
  3. Supports the fetal growth and prevents desiccation.
  4. Forms protective plug in cervix of uterus during pregnancy.
  1. Which set of hormones is secreted only during pregnancy?
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  2. Human placental lactogen, estrogen and chorionic thyrotropin.
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  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.
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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?
  1. Of the total number of daughters, 50% daughters are carrier and $50 \%$ are haemophilic.
  2. All the daughters are haemophilic.
  3. All sons are haemophilic and all daughters are normal.
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  3. $25 \%$ female progenies carry only the gene of colourblindness.
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  1. The options are as follow:
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  3. Normal male
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  1. The options are as follow:
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While studying inheritance of characters, a teacher gave the example of inheritance of attached earlobe and hypertrichosis of the ear to her students. A man with attached earlobes and extensive hair on pinna married a woman having free earlobes. The couple had four children, one son with attached earlobes and hairy pinna, one son with a free earlobes and hairy pinna and two daughters with attached earlobes. One of the daughters married a man with free earlobes and sparse hair on pinna. Teacher said if this couple would have sons there would be equal chances for both having free or attached earlobes and sparse hair on pinnae.
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  2. 100%
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  1. 50%
  2. 100%
  3. 75%
  4. 0%
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In prokaryotes, DNA is circular and present in the cytoplasm but in eukaryotes, DNA is linear and mainly confined to the nucleus. DNA or deoxyribonucleic acid is a long polymer of nucleotides. In 1953, the first correct double-helical structure of DNA was worked out by Watson and Crick. Based on the X-ray diffraction data produced by Maurice Wilkins and Rosalind Franklin. It is composed of three components, i.e., A phosphate group, a deoxyribose sugar and a nitrogenous base. Different forms of DNA are B-DNA, Z-DNA, A-DNA, C-DNA and D-DNA.
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  2. Earwin Chargaff
  3. Federick Griffith
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S.no
Polynudeotide chains
Polynudeotide chains
(a)
Parallel
5
(b)
Anti-parallel
10
(c)
Parallel
15
(d)
Anti-parallel
20