Plant Reproduct...

Which of the following statements regarding the structure of microsporangium are correct?
(i) Microsporangium is generally surrounded by four wall layers-epidermis, endothecium, middle layers, and tapetum.
(ii) Outer three layers perform functions of protection and dehiscence of anthers.
(iii) Cells of tapetum undergo meiosis and produce microspore tetrads.

Read the given statements.
(i) Outer exine is made up of sporopollenin.
(ii) Inner intine is pecto-cellulosic in nature.
(iii) Generative cell is bigger and contains abundant food reserve.
(iv) Vegetative cell is small and floats in the cytoplasm of the generative cell.
Which of the given statements are not true regarding structure of pollen grain?

Select the mismatched pair.

A dithecous anther consists of ____(i)_______microsporangia, _____(ii)_______ in each lobe.

A typical angiospermous ovule is attached to the placenta by means of a stalk called X. Body of the ovule fuses with X in the region called Y. Identify X and Y.

Select the correct option regarding the ploidy level of different structures of an angiospermous ovule.

Which of the following options is correct?

Refer to the given characteristics of some flowers.
(i) Light and non-sticky pollen grains
(ii) Exserted stigmas and anthers
(iii) Large, often feathery stigmas
(iv) Flowers colourless, odourless and nectarless
(v) Common in grasses

Above features are the characteristics of  

Spiny or sticky pollen grains and large, attractively coloured flowers are associated with

In (i) condition, both male and female flowers are borne on the same plant; an example of such plants is (ii).