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The endosperm of angiosperms is developed from
A
antipodals
B
zygote
C
synergids
D
secondary nucleus
Correct Answer:
secondary nucleus
Consider the following statements and choose the correct answer:
1. For the development of viable seeds the double fertilization is very necessary
2. The net result of double fertilization is the formation of endosperm from the triploid nucleus
3. In Angiosperms very free nuclear divisions take place as in Gymnosperms
4. The endosperm nucleus has both maternal and paternal characters showing physiological importance like hybrid vigour
A
Only 1, 2 and 3 are true
B
Only 2, 3 and 4 are true
C
Only 1, 3 and 4 are true
D
Only 1, 2 and 4 are true
Consider the following statements regarding Xenia and choose the correct answer:
1. If a white variety (yy) is pollinated with pollen from a yellow variety (YY), one of the male gametes (Y) will unite with the egg (y) to produce a hybrid embryo (Yy) which will act as a heterozygote for yellow endosperm in the next generation
2. The second male gamete (Y) will unite with the two polar nuclei (y, y) and produces the primary endosperm nucleus (Yyy) which is triploid
3. If a yellow endosperm variety (YY) is crossed with pollen from a white grained variety, the grains produced are white like the pollen parent
A
Only 1 and 2 are true
B
Only 2 and 3 are true
C
Only 1 and 3 are true
D
1, 2 and 3 are true
In which of the following families of angiosperms, endosperm development is absent?
A
Malvaceae and Campanulaceae
B
Leguminosae and Umbelliferae
C
Orchidaceae and Podostemaceae
D
Anonaceae and Aristolochiaceae
Endosperm of angiosperms is produced after fertilization ora male gamete with
A
Antipodals
B
Synergids
C
Secondary nucleus
D
Oosphere
In which of the following types of endosperm, the first nuclear division of the primary endosperm nucleus is followed by the formation of either a longitudinal or transverse wall in the central cell?
A
Helobial endosperm
B
Nuclear endosperm
C
Cellular endosperm
D
Both A and B
Gymnosperms and Angiosperms are together called as __________
A
Spermatophyta
B
Sporophyta
C
Dermitophyta
D
Embryophyta
What is the reproductive unit in angiosperms?
A
Flowers
B
Stalk
C
Pedicel
D
Leaf
Who replaces the rooted-floating angiosperms in a hydrarch succession?
A
Phytoplankton
B
Zooplankton
C
Free-floating plants
D
Rooted-submerged plants
Which of the following is a characteristic of all angiosperms?
A
double internal fertilization
B
ovules that are not contained within ovaries
C
complete reliance on wind as the pollinating agent
D
free-living gametophytes
Which of the following is not true about Angiosperms?
A
Dominant phase is gametophytes
B
Vascular bundles are present
C
Spores are heterospores
D
Seeds are covered