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Plant Growth and Mineral Nutrition — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPlant Growth and Mineral Nutrition1 Mark
Question
Growth inhibitors of plants.
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Answer

Ethylene and abscissic acid.

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Read the following and answer any four questions from (i) to (v) given below:
Golden rice was engineered from normal rice by Potrykus and Beyer in the $1990\ s$. The typical golden colour is due to the production of $\beta$-carotene a precursor of vitamin-A. Golden rice differs from its parental strain by the addition of three $\beta$-carotene genes. These included two genes from daffodil plant and third from a bacterium. The incorporation of these genes allows the rice plant to modify certain metabolic pathways in its cells to produce $\beta$-carotene.
  1. Due to genetic modification golden rice plants produce and store $\beta$-carotene in:
  1. Stem.
  2. Seed.
  3. Leaves.
  4. All of these.
  1. Transfer of genes to produce golden rice is achieved by:
  1. Agrobacterium.
  2. pBR322
  3. $\lambda$-phage.
  4. gene gun.
  1. In golden rice two genes were taken from:
  1. Narcissus sp.
  2. Erwinia.
  3. Coryza saliva.
  4. None of these.
  1. Golden rice is helpful to fight against disease caused by the deficiency of:
  1. Vitamin $B_{12}$
  2. Vitamin C
  3. Vitamin A
  4. Vitamin D
  1. Golden rice was genetically engineered by
  1. Fire and Mello.
  2. Potrykus and Beyer.
  3. Banting and Best.
  4. Kohler and Milstein.
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What is genu and splenium?
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Which layer of uterus undergoes cyclic changes during the menstrual cycle?
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The following statements (i), (ii) and (iii) seem to describe the waterpollinated submerged plants. Which one of these statements is incorrect?
  1. The flowers do not produce nectar.
  2. The pollen grains have mucilaginous covering.
  3. The brightly coloured female flowers have long stalk to reach the surface.
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The part of gynoecium that determines the compatible nature of pollen grain.
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What are sticky ends?
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Among bryophytes, lichens and fern which one is a pioneer species in a xeric succession?
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What is a synaptic cleft?
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Pollen viability
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What technical term is given to the fish-like reptiles?
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