The lower end of the embryonal axis in maize has the radicle and root cap enclosed in
1. An extension of scutellum
2. A structure called coleoptile
3. A differentiated sheath
4. A structure called coleorrhiza
Mark the incorrect statement
1. Hybrid seeds have to be produced every year
2. Production of hybrid seeds is costly
3. If the seeds collected from hybrids are sown, the progeny do not maintain hybrid characters
4. Cultivation of hybrids has decreased productivity
Male and female plants are not separate in case of
1. Papaya and date-palm
2. Mulberry and papaya
3. Date-palm and mulberry
4. Castor and maize
In Polygonum type of embryo sac, polar nuclei
1. Are haploid
2. Can serve as a precursor of PEN
3. Occur in the large central cell
4. More than one option is correct
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