Subject Experts Solutions for Exercise 2: HOTS HIGHER ORDER THINKING SKILLS

In angiosperms, the female gametophyte is called an embryo sac. The given figures represent different stages of embryo sac development in angiosperms. Arrange them in the correct order and select the correct option.

Pollen grains that would easily germinate on stigma are found to germinate in vitro, only when $10-200$ ppm of boric acid is added. This suggests that

In cereals, one or a few outermost layers of the endosperm become highly specialized morphologically and physiologically and constitute the aleurone tissue. Which of the following statement regarding aleurone tissue (or aleurone cells) is incorrect?

Consider the following statements.

(i) Polyspermy may bring about the fertilization of an 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 that usually persists after fertilization.
(iii) Intine is the inner, pectocellulosic layer of pollen grain wall which is destroyed during acetolysis.
(iv) Exine layer of pollen grain comprises an outer non-sculptured layer sexine and an inner sculptured layer tectum.

Which of the following combinations of the above-given statements is correct?

Given figure shows the pollen-stigma interaction, where pollen wall proteins are released onto the pellicle of stigmatic papillae, where recognition reaction occurs.

Which of the following statement drawn from the given figure is incorrect?