Read the following four statements (A-D): (i) The outer wall of the pollen grain is pecto-cellulosic in nature. (ii) In pollen grain, the generative cell is bigger and contains abundant food reserve. (iii) In all angiosperms, pollen grains are always shed at the 2-celled stage. (iv) Usually, sporogenous cell directly behaves as the megaspore mother cell. How many of the above statements are wrong?

Question

Read the following four statements (A-D): (i) The outer wall of the pollen grain is pecto-cellulosic in nature. (ii) In pollen grain, the generative cell is bigger and contains abundant food reserve. (iii) In all angiosperms, pollen grains are always shed at the 2-celled stage. (iv) Usually, sporogenous cell directly behaves as the megaspore mother cell. How many of the above statements are wrong? (A) Four (B) One (C) Two (D) Three

Tardigrade Admin · Accepted Answer

The inner wall of the pollen grain is called the intine. It is a thin and continuous layer made up of cellulose and pectin. The cytoplasm of pollen grain is surrounded by a plasma membrane. When the pollen grain is mature it contains two cells, the vegetative cell and generative cell. The vegetative cell is bigger, has abundant food reserve and a large irregularly shaped nucleus. The generative cell is small and floats in the cytoplasm of the vegetative cell. It is spindle shaped with dense cytoplasm and a nucleus. In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage.
As the anther develops, the cells of the sporogenous tissue undergo meiotic divisions to form microspore tetrads. Each one is a potential pollen or microspore mother cell. The process of formation of microspores from a pollen mother cell (PMC) through meiosis is called microsporogenesis.