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Sexual Reproduction in Flowering Plants 

Quiz-12

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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. Pollens are be stored at which temperature
  •  -196°C
  •   196°C
  •    10°C
  •     0°C
Solution
Pollen grain stored at -196°C which is the temperature of liquid nitrogen. In that temperature the sperm can also be stored. Such stored pollen can be used as pollen banks, similar to seed bank in crop breeding experiment

Q2.The diagram depicts
        

  •  Water pollination in Vallisneria (tape-grass)
  •  Air pollination in Vallisneria (tape-grass)
  •  Anemophily in Vallisneria (tape-grass)
  •  Zoophily in Vallisneria (tape-grass)
Solution
Water pollination in Vallisnaria (tape grass). In water pollinated plants the water is the carrier of pollen. Water does the same work as air in the air pollinated flowers both produces large amount of male gametes

Q3.  Identify the A to E in following diagram

  •   A-Cotyledons, B-Hypocotyle, C-Plumule, D-Root cap, E-Radicle
  •   A- Radicle, B- Root cap, C- Plumule, D- Hypocotyle, E- Cotyledons
  •  A- Hypocotyle, B- Cotyledons, C- Plumule, D- Radicle, E- Root cap
  •  A- Plumule, B- Cotyledons, C- Hypocotyle, D- Radicle, E- Root cap
Solution
The diagram showing typical dicot embryo having various important parts. A typical dicotyledonous embryo, consist of an embryonal axis and two cotylendons. The portion of embryonal axis above the level of cotyledons is epicotyle, which terminates with plumule or stem tip. The cylindrical portion below the level of cotyledons is hypocotyl that terminates at its lower end in the radicle or root tip Root tip is covered with root cap

Q4. If stem has 2n=10 number of chromosomes than find out 
       A – number of chromosomes in endosperm 
       B – number of chromosomes in egg cell 
       C – number of chromosomes in polar nuclei
  •  15, 15, 20
  •  10, 15, 20
  •  15, 5, 10
  •  10, 5, 15
Solution
Endosperm =3n=5×3=15 chromosome Egg cell =1n=1×5=5 chromosome Polar cell =2n=2×5=10 chromosome

Q5.The diagram given below represents the sectional view of
                    

  •  Amphitropous ovule
  •  Campylotropous ovule
  •  Anatropous ovule
  •  Orthotropous ovule
Solution
 When the micropyle, body of the ovule and funicle lie in one vertical plane, the ovule is called orthotropous, e.g., Polygonum

Q6. How many nuclei take part in double fertilization of flowering plants?
  •  3
  •  2
  • 4
  •  8
Solution
Double fertilization is characteristic feature of angiosperms. It is a fusion of two male gamates brought by a pollen tube to two different cells of the same female gametophyte to produce zygote and endosperm. A total of five nuclei takes part in double fertilization (sometimes called four as the two polar nuclei fuses to form one).

Q7. Which of the following is incorrect in angiosperm?
  •  Pollen grain - Haploid
  •  Megaspore - Diploid
  •  Synergid - Haploid
  •  Endosperm - Triploid
Solution
In angiosperm, a single diploid Megaspore Mother Cell (MMC) matures within an ovule. Through first meiosis, it gives rise to a dyad cell and then second meiosis takes place which forms four megaspores (haploid). In most plants, only one of these megaspore, survives, the rest are absorbed by the ovule.

Q8. 8-nucleated embryo sac are
  •  Monosporic
  •  Bisporic
  •  Tetrasporic
  •  Any of these
Solution
8 nuclei are found in one embryo sac so it is monosporic

Q9. Identify the structures marked A to F in the given diagram

  •  A-Asymmetric nucleus, B-Nucleus, C-Generative cell, D-Vegetative cell, E-Pollen, F-Pollen tetrad
  •  A- Pollen tetrad , B- Pollen, C-Generative cell, D-Vegetative cell, E-Asymmetric spindle, F-Nucleus
  •  A-Pollen tetrad, B-Vacuole, C-Nucleus, D-Asymmetric spindle, E-Vegetative cell, F-Generative cell
  •  A-Vacuole, B-Nucleus, C-Pollen tetrad, D-Vegetative cell, E-Asymmetric spindle, F- Generative cell
Solution
Stage of microsporogenesis forming pollens. Pollen Grain When pollen grain matures it contains two cells (i) Vegetative cell Vegetative cell is bigger and has abundant food reserve and a large irregular shaped nucleus (ii) Generative cell The generative cell is small and floats in the cytoplasm of vegetative cell. It is spindle-shaped with dense cytoplasm and a nucleus

Q10. Which of the following is pollinated by water?
  •  Viola
  •  Yucca
  •  Oxalis
  • Commelina
Solution
Pollination with the help of water is called hydrophily. Plants, which occur below the water level are called sub-merged plants. When pollination occurs in these plants, it is called hypohydrophily, e.g., Zostera,Najas, etc.

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