Q1.The phenomenon involved in formation of female gametophyte is known as
Answer : Option DExplaination / Solution:
The process of formation of female gametophyte inside the ovary by meiotic and mitotic division is called megasporogenesis.
Answer : Option AExplaination / Solution:
Anther produces pollen grains by the process of meiosis in which four microspores are produced by single microspore mother cell. The number of chromosome reduces to half.
Q3.The inner most wall layer of microsporangium is called as
Answer : Option DExplaination / Solution:
Microsporangium is covered by a number of layers. The outer layer or integuments surround the tepetum. The tepetum provide nutrients to growing microspores that leads to pollen grains.
Answer : Option AExplaination / Solution:
Pollen grain is covered by two layers. The outer layer is called exine, made up of tough material. The inner layer is intine. There is a small opening in exine layer through which pollen grain germinate to form pollen tube.
Q5.The alternation of two different phases of the life cycle involving haploid and diploid stage is called
Answer : Option CExplaination / Solution:
Alternation of generation is the cyclic change in organisms involving haploid and diploid stages. Meiotic division results into haploid stage and fusion of haploid gametes results into diploid stage.
Q6.In some plants diploid embryo sac develop directly from diploid megaspore mother cell. This condition is called as Megaspore mother cell are diploid, which generally undergo reduction division to produce megaspore but in some plants diploid megaspore mother cell directly produce diploid embryo sac this condition is called diplospory
Answer : Option DExplaination / Solution:
Megaspore mother cell are diploid, which generally undergo reduction division to produce megaspore but in some plants diploid megaspore mother cell directly produce diploid embryo sac this condition is called diplospory
Q7.Identify “A” and “B” in the T.S of mature anther
Answer : Option DExplaination / Solution:
The mature anther consists of four microsporangia which contain four layers. The inner most layer is called tapetum that provide nutrient to growing microspores and tissues inside it are called microspore mother cell that produce pollen grain.
Q8.Within the embryo sac, three cells at chalazal end are called
Answer : Option DExplaination / Solution:
The embryo sac is 8 nucleate, 7 celled structure. The three at micropylar ends are called egg Synergids and three at chalazal end are called antipodal cell. The remaining two at center forms the polar bodies.
Q9.How many meiotic divisions are required to form 64 pollen grains
Answer : Option AExplaination / Solution:
Each microspore mother cell produces four pollen grains by reduction division. Hence to produce 64 pollen grains 16 meiotic or reduction division is required.
Q10.Filiform apparatus present at micropylar part of the Synergids help in
Answer : Option AExplaination / Solution:
Filiform apparatus is finger-like projection attached with egg apparatus. This apparatus guide the pollen tube carrying male gametes for facilitating Syngamy.
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