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Reproduction in flowering plants Quiz-08

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NEET is the most famous and important medical entrance examination held in our country. This exam is an objective type, an offline test which includes 4 sections namely– Physics, Chemistry, Botany, and Zoology. The maximum marks that can be scored are 720 marks and have 180 questions. About half of the paper consists of questions from Biology, as the NEET exam essentially focuses on capacitating students to go for seats in medical courses. One of the most significant and crucial sections in the NEET exam is of Biology. It comprises of theories, descriptions, discoveries, diagrams, definitions, explanations of differences, and relations. The majority of the topics covered in the NEET syllabus are from the NCERT syllabus of Class 11 & 12 and other related sources become part of the rest of the syllabus. Clear Exam curates a list of articles selected by professionals who recommend the highly vital topics for NEET exams. The table below takes you directly to the respective topic where the in-depth article and the MCQs are available for an easy and productive learning experience. Prior to solving NEET question papers or practicing mock tests, you must ensure to study the basic concepts in NEET and practice a few sample questions related to this exam. Students will be covered for all their studies as the topics are available from basics to even the most advanced. .

Q1.   For the formation of tetrasporic embryo sac, how many megaspore mother cells are required?
  •  1
  •  2
  •  3
  •  4
Solution
(d) When all the fourmegaspore nuclei take part in the formation of the female gametophyte (embryo sac), this type of development is called as tetrasporic. In tetrasporic emryo sacs, meiosis is not accompanied by wall formation.

Q2.   Chances of pollination in air and water are increased by increasing number of pollens. This statement is
  •  True
  •   False
  •   Sometimes (a) and sometimes (b)
  •  Neither (a) nor (b)
Solution
(a) True Plants, in which the water or air pollination is prevelant, produces large number of pollens because of wastage of pollen during pollination by abiotic means

Q3.   

  •  A-Synergid, B-Filiform apparatus, C-Male gamete, D-Plasma membrane, E-Central cell, F-Egg nucleus, G-Vegetative nucleus
  •  A- Filiform apparatus, B- Central cell, C- Egg nucleus, D- Vegetative nucleus, E- Male gamete, F- Synergid, G- Plasma membrane
  •  A- Plasma membrane, B- Synergid , C- Filiform apparatus, D- Male gamete, E- Vegetative nucleus, F- Central cell, G-Egg nucleus
  •  A- Central cell, B- Egg nucleus, C- Vegetative nucleus, D- Male gamete, E- Synergid, F-Plasma membrane
Solution



Q4.   Double fertilization is fusion of
  •  Two eggs
  •  Two eggs and polar nuclei
  •  One male gamete with egg and other with synergid
  •  One male gamete with egg and other with secondary nucleus
Solution
(d) The double fertilization was discovered by S G Nawaschin (1898) and Guignard in Lilium and Fritilaria. Double fertilization is restricted only to angiosperms. When pollen tube enters ovule, it strikes one of the synergids and burst open to release the two male gametes, which fuse with two different structures in the same female gametophyte. Thus, double fertilization can be distinguished as : 1.Generative Fertilization: Fusion of one male gamete with the egg producing diploid zygote or oospore. 2.Vegetative Fertilization: Fusion of nucleus of second male gamete with the diploid secondary (fused) nucleus or the triple fusion, i.e., fusion of one male polar nuclei forming endosperm (3n).

Q5.   Which of these cells is the largest cell of the ovule?
  •   Antipodal cell
  •   Central cell
  •  Megaspore mother cell
  •  The size of the cells varies from species to species and none of the given above can be treated as largest
Solution
(d) Central cell is the largest cell of embryo sac and is mother cell of endosperm. The enlargement of the embryo sac after the last nuclear division is largely due to inflation of the large central vacuole of central cell.

Q6.   “In Western countries a large number of …… Product in the form of tablets and ……. are available in market. Pollen consumption claimed to increase the …… of athelete”. The words to fill blanks in sequential order are
  •  Pistil, syrup, power
  •  Stamen, food, sexual urge
  •  Carpel, yoghurt, labido
  •  Pollen, syrup, performance
Solution
(a) Pollen, syrup increase/improve performance because pollen contain highly nutritive material in the form of vegetative cell

Q7.   Find out right statement (s) I. Most common endosperm is of nuclear type II. Coconut water is male gametophyte III. Coconut has both nucellar and cellular type of endosperm
  •  I, II and III
  •   I and III
  •  II and III
  •  I and II
Solution
(b) In coconut endosperm two type of division takes place, cellular and nuclear and it is the female gametophyte not male. In coconut endosperm cellular endosperm surrounds the nuclear endsopores

Q8.   



  •  Multicarpellary apocarpous
  •  Multicarpellary syncarpous
  •  Multicarpellary pistillate
  •  Monocarpellary apocarpous
Solution


Q9.   The phenomenon in which, anther and stigma grow and mature at same time is called
  •  Homogamy
  •   Syngamy
  •  Allogamy
  •  Fusion
Solution
(a) Homogamy is condition, in which male and female parts of a flower mature simultaneously.

Q10.   Apogamy is
  •  Reproduction of virus
  •  Failure of fusion of gametes
  •  Development of bacteria
  •  Loss of function of reproduction
Solution
(b) Apogamy was first reported by Farlow (1874). It can be defined as the development of a sporophyte directly from the gametophyte without the intervention of sex organs and gametes.


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