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Reproduction in Lower and Higher Plants — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYReproduction in Lower and Higher Plants1 Mark
Question
What is vegetative reproduction?
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Answer

In this method, new plants are produced by the vegetative parts of the plants. The vegetative part mean the leaf, stem and root. Potato, mint, ginger, banana etc. are reproduced by this method.
Vegetative propagation can occur by natural methods as well as by artificial methods.Natural method includes reproduction by stem, by roots and by leaves.Artificial method include reproduction by cutting, layering, grafting and tissue culture.

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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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Name the group of organisms that produce non-motile gametes. How do they reach the female gamete for fertilisation?
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Why is algal bloom considered to be bad?
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The GEAC refers to:
  1. Genetic Engineering Authorised Company.
  2. Genetic Engineering Approval Committee.
  3. Genetic Engineering American Company.
  4. Genetic Elements and Corrections.
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Free-living or Non-Symbiotic N2 fixing microorganisms.
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Which is the process by which mainly we get nitrogen in human tissues?
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