Endosperm development precedes embryo development because

1. It is  a product of triple fusiony

2. It provides nutrition to developing embryo

3. It is larger than embryo

4. Its development mostly occurs by free nuclear division in PEN

Viability of seeds

1. Maybe lost within a few months

2. Is 1000 years in Lupinus arcticus

3. Recorded in Phoenix is 10000 years

4. Can be tested by 0.1% solution of TTC

Pollen grains lose viability within 30 minutes of their release in the members of family

1. Rosaceae

2. Solanaceae

3. Poaceae

4. Leguminosae

Endosperm persists in the mature seeds of

1. Pea

2. Groundnut

3. Gram

4. Maize

Functional megaspore in Polygonum divides by free nuclear mitotic divisions and develops into 8 nucleated and 7 celled female gametophytes. The largest cell of this gametophyte is

1. Antipodal cell

2. Central cell

3. Synergid cell

4. Egg cell

Find the incorrect statements with respect to pollen grain in angiosperms plants

a. Germ pores are areas in pollen wall where intine and sporopollenin are absent

b. The vegetative cell is bigger, has abundant food reserves, and a large irregularly shaped nucleus

c. The fascinating array of patterns and designs are exhibited by exine wall

d. In over 60 percent of angiosperms, pollen grains are shed at 3-celled stage

1. c and d

2. a and d

3. b and d

4. a and c

Most of the aquatic and land plants are pollinated by

1. Insects or wind

2. Water and insects respectively

3. Abiotic factors only

4. Water and wind respectively

Which one of the following statements is not true?

During microsporogenesis

1. Microspore tetrad is developed by meiosis in sporogenous tissue

2. Pollen grains are developed by mitosis in sporogenous tissue

3. Microspore develops into the male gametophyte

4. Male gametes are produced by pollen grain

Mark the mis-matched pair

1. Orchid           -  Tiny seeds

2. Hydrophily    -  Common in dicots

3. Pollen grain   -  25 to 50 $\mathrm{\mu m}$ in diameter

4. Parthenium   -  Pollen allergy