Pollen tube releases the two male gamete into the:
(1) One male gamete in cytoplasm of synergids and other in cytoplasm of central cell
(2) Both in cytoplasm of central cell
(3) Cytoplasm of Antipodal cell
(4) Both in cytoplasm of synergids

Read the statements and select option representing correct statements with respect to stamen.
A. The distal end of filament is attached to thalamus.
B. A typical anther is dithecous and bisporangiate.
C. Connective is sterile vasculated tissue.
D. Microsporangia develop further and become pollen sacs.
1. A & B                       2. A & C
3. B & C                       4. C & D

Outer three layers of anther wall perform the function of

The genetic mechanism, that prevents self pollen (from the same flower or other flowers of the same plant) from fertilising the ovules by inhibiting pollen germination or pollen tube growth in the pistil, is called as

Plants pollinated by wind do not show

Genetically and functionally self-pollination is cent percent ensured with seed formation even in the absence of pollinators by

1. Bisexuality                   
2. Dicliny
3. Geitonogamy               
4. Cleistogamy

Polygonum type embryo sac is

Ovule generally differentiate a single _____ in the ______ region of the nucellus.

How many statement(s) is/are correct for pollen grains?
a. Parthenium is a cause of bronhial afflictions
b. Intine exhibits fascinating array of patterns and designs
c. Cytoplasm of pollen grain is surrounded by spermoderm
d. Generative cell is present when pollens are shed in 40 percent plants.
1. One                             2. Two
3. Three                          4. Four

Fossilization of pollen grains is helped by