REPRODUCTION IN
LOWER AND
HIGHER PLANT
Mcq
,
, Q. 2 Very short answer type questions :
1. Name the part of gynoecium that determines the compatible nature of pollen
ANS : stigma
2. How many haploid cells are present in a mature embryo sac ?
ANS : An unfertilized embryo sac of angiosperm is composed of 7 cells i.e., 7-c
8-nuclei. Among 8-nuclei, 6 are enclosed by cell walls and are organized into ce
are haploid in number - 3 antipodal, 2 synergids and 1 egg cell and a large cen
with 2 pollen nuclei.
3. Even though each pollen grain has 2 male gametes, why atleast 20 pollen grain
required to fertilize 20 ovules in a particular carpel?
ANS : because only one male gamete is involved in syngamy or the fusion of m
gamete with the egg cell.
4. Define megasporogenesis ?
ANS : Formation of megaspores from megaspore mother cell called megasporo
occurs inside the nucellus of ovule of angiosperm. The process begins very ear
nucellus is not completely surrounded by the integuments.
5. What is hydrophily ?
ANS : Hydrophily is the term given to pollination occurred by water. Some plan
distribute their pollen to the surface of water and some plants distribute polle
beneath the surface of water.
LOWER AND
HIGHER PLANT
Mcq
,
, Q. 2 Very short answer type questions :
1. Name the part of gynoecium that determines the compatible nature of pollen
ANS : stigma
2. How many haploid cells are present in a mature embryo sac ?
ANS : An unfertilized embryo sac of angiosperm is composed of 7 cells i.e., 7-c
8-nuclei. Among 8-nuclei, 6 are enclosed by cell walls and are organized into ce
are haploid in number - 3 antipodal, 2 synergids and 1 egg cell and a large cen
with 2 pollen nuclei.
3. Even though each pollen grain has 2 male gametes, why atleast 20 pollen grain
required to fertilize 20 ovules in a particular carpel?
ANS : because only one male gamete is involved in syngamy or the fusion of m
gamete with the egg cell.
4. Define megasporogenesis ?
ANS : Formation of megaspores from megaspore mother cell called megasporo
occurs inside the nucellus of ovule of angiosperm. The process begins very ear
nucellus is not completely surrounded by the integuments.
5. What is hydrophily ?
ANS : Hydrophily is the term given to pollination occurred by water. Some plan
distribute their pollen to the surface of water and some plants distribute polle
beneath the surface of water.
