The egg apparatus is made up of two ________ and one ________ at the ________ end of the embryo sac.
(1) antipodals, egg cell, micropylar
(2) synergids, egg cell, chalazal
(3) egg cells, synergids, chalazal
(4) synergids, egg cells, micropylar
(4)
Difficulty Level:
Consider the following features seen in a plant:
I. Male and female reproductive organs are generally found in separate flowers.
II. The male flowers having a number of long filaments terminating in exposed stamens.
III. The female flowers having long, feather-like stigmas.
The flowers of this plant would most likely be pollinated by:
(1) Wind
(2) Water
(3) Bees
(4) Birds
(1) Exposed stamens to wind will help in spread of pollens. Large feathery stigma would be a good receptacle for pollens.
Difficulty Level:
The cells of which of the following layers of the anther wall are multinucleated due to endomitosis?
(1) Epidemis
(2) Endothecium
(3) Middle layer
(4) Tapetum
(4) The tapetum is a specialised layer of nutritive cells found within the sporangium, particularly within the anther, of flowering plants, where it is located between the sporangenous tissue and the anther wall. The cells are polyploidy.
Difficulty Level:
Consider the following features seen in a plant:
I. Male and female reproductive organs are generally found in separate flowers.
II. The male flowers having a number of long filaments terminating in exposed stamens.
III. The female flowers having long, feather-like stigmas.
The flowers of this plant would most likely be pollinated by:
(1) Wind
(2) Water
(3) Bees
(4) Birds
(1) Exposed stamens to wind will help in spread of pollens. Large feathery stigma would be a good receptacle for pollens.
Difficulty Level:
A typical angiosperm anther is dithecous which means that it is:
(1) One lobed and the lobe has two theca
(2) Two lobed and each lobe has two theca
(3) Two lobed and each lobe has one theca
(4) Four lobed and each lobe has two theca
(3) Read page 21, XII NCERT
Difficulty Level:
Which of the following layers in the wall of an anther nourishes the developing pollen grains?
(1) Tapetum
(2) Epidermis
(3) Endothecium
(4) Middle layers
(1) Read page 21, XII NCERT
Difficulty Level:
Pollen intine is made of:
(1) Sporopollenin
(2) Cellulose and pectin
(3) Ergosterol
(4) Phospholipids and cholesterol
(2) Read page 23, XII NCERT
Difficulty Level:
Pollen grains lose their viability within 30 minutes of their release in:
(1) Rose
(2) Potato
(3) Pea
(4) Wheat
(4) Read page 24, XII NCERT
Difficulty Level:
The pistil of Papaver is:
(1) Monocarpellary
(2) Multicarpellary apocarpous
(3) Multicarpellary syncarpous
(4) Absent
(3) Read page 25, Figure 2.7, XII NCERT
Difficulty Level:
How many of the nuclei in the female gametophyte in angiosperms are surrounded by cell wall?
(1) 5
(2) 6
(3) 7
(4) 8
(2) Read page 27, XII NCERT
Difficulty Level: