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

Only 1, 2 and 3 are true

Only 2, 3 and 4 are true

Only 1, 3 and 4 are true

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

Only 1 and 2 are true

Only 2 and 3 are true

Only 1 and 3 are true

1, 2 and 3 are true

Consider the following statements and choose the correct answer:
1. Intense or strong light retards the growth of shoot
2. Shade plants are shorter and stockier than sun plants
3. Shade plants have dense covering of hairs while sun plants are less hairy
4. The stems of shade plants are taIler and more branched than that of sun plants

Only 1, 2 and 3 are true

Only 2 and 3 are true

Only 1 and 4 are true

Only 2, 3 and 4 are true

The tetraploid secondary nucleus after fertilization by a male gamete produces a pentaploid endosperm in which of the following plants?

Erythronium

Sambuscus

Ulmus

Lilioideae

Consider the following statements and choose the correct answer:
1. The C₄ plants can absorb CO₂ even from a much low CO₂ concentration when the C₃ plants fail to avail it
2. The C₄ plants require less energy to fix CO₂ as compared to C₃ plants
3. C₄ plants are better adapted to tropical and desert areas where sunlight is more intense and the growing season is longer
4. Maize is a C₄ plant

1, 2 and 3 are true

2, 3 and 4 are true

1, 3 and 4 are true

Only 2 is true

S₁:Palaeobotany is the study of fossil plants preserved in rocks dating back in millions of years.
P :Records of the history of the world are contained in fossils.
Q :Through the ages, plants have evolved from simple to more complex forms.
R :First there were water plants then land plants appeared during the Paleozoic era.
S :But since the fossil remains appear locked in rock layers, they are closely related to the geologist area of investigation.
S₆:The fossil plants indicate the age of the rock, and also point to facts regarding climate, temperature and topography.

The Proper sequence should be:

RQSP

SQRP

PSQR

QRPS

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?

Helobial endosperm

Nuclear endosperm

Cellular endosperm

Both A and B

In _______, the endosperm is a special tissue which is formed as a result of vegetative fertilization.

gymnosperms

angiosperms

dichosperms

parenchyma

দ্বিনিষেকের ফলে উৎপন্ন শস্য কী ধরনের হয়? (What type of endosperm is produced from double fertilization ?)

হ্যাপ্লয়েড (Haploid)

ডিপ্লয়েড (Diploid)

ট্রিপ্লয়েড (Triploid)

হেক্সাপ্লয়েডে (Hexaploid)

Endosperm of angiosperms is produced after fertilization ora male gamete with

Antipodals

Synergids

Secondary nucleus

Oosphere