NEET Biology question
Consider the following statements. (i) Polyspermy may bring about fertilization of the egg by more than one male nucleus, or the supernumerary sperms may fertilize other components of the embryo sac such as synergids or antipodals. (ii) In angiosperms, the pollen tube is normally an unbranched structure which usually persists after fertilization. (iii) The intine is the inner, pectocellulosic layer of the pollen grain wall, which is destroyed during acetolysis. (iv) The exine layer of the pollen grain comprises an outer, non-sculptured layer called sexine, and an inner, sculptured layer called tectum. Which of the following combinations of the above statements is correct?
Solution
Statement (i) is true — supernumerary male gametes delivered during polyspermy may indeed fertilize the egg itself or other embryo-sac cells like synergids/antipodals. Statement (iii) is also true — intine is the thin, inner, pectocellulosic (cellulose + pectin) layer of the pollen wall, and because it lacks resistant
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