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Reproduction in flowering plants Quiz-06

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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.   60% of the angiosperms shed their pollens at the
  •  2-celled stage
  •  3-celled stage
  •  4-celled stage
  •  1-celled stage
Solution
(a) 60% of angiosperms shed their pollens at two celled stage and in rest 40% the pollens are shed at three celled stage which is formed by division in generative cell mitotically

Q2.   Most oldest viable seed is of
  •  Lupine
  •  Ficus
  •  Date palm
  •  Phoenix
Solution
(a) Viability means ability to grow. This is a certain time period in which plant seed have ability to germinate. Lupine have the viability period about 10,000 years

Q3.   Which of the following statements about sporopollenin is false?
  •  Exine is made up of sporopollenin
  •  Sporopollenin is one of the resistant organic materials
  •  Exine has apertures called germ pores where sporopollenin is present
  •  Sporopollenin can withstand high temperatures and strong acids
Solution
(c) Exine is chiefly made up of sporopollenin. Exine is discontinous or ruptured only by nexine at some places (where sporopollenin absent), these are called pores, through which pollen tubes come out during germination on stigma.

Q4.   An interesting modification of flower shape for insect pollination occurs in some orchids in which a male insect mistakes the pattern on the orchid flower for the female of his species and tries to copulate with it, thereby pollinating the flower. This phenomenon is called
  •   Pseudoparthenocarpy
  •  Mimicry
  •  Pseudopollination
  •  Pseudocopulation
Solution
(d) Pseudocopulation describes behaviours similar to copulation that serves a reproductive function for one or more or both the participants but not involve actual sexual union between the individuals. It is most generally applied to a pollinant attempting to copulate with a flower. Orchids commonly achieve reproduction in this manner.

Q5.   Bright colouration of flowers is an adaptation for
  •  Anemophily
  •  Hydrophily
  •  Malacophily
  •  Entomophily
Solution
(d) Bright coloured flowers attract the insects. These insects takes part in the pollination of these flowers, therefore, bright colouration of flowers is an adaptation for entomophily, i.e, pollination by insects.

Q6.   Occurrence of more than four spores from a spore mother cell is called
  •  Polysiphony
  •  Polyspermy
  •  Polyspory
  •  Polyembryony
Solution
(c) Polyspory is the occurrence of more than four spores form a spore mother cell.

Q7.   In previous figure find out F and G
  •  F-Radicle; G-Root cap
  •  F-Root cap; G-Coleorhiza
  •  F-Epiblema; G-Radicle
  •  F-Root cap; G-Epiblema
Solution



Q8.   Devices for self-pollination are
  •  Dicliny or unicexuality
  •  Dichogamy
  •   Heterostyly
  •  None of these
Solution
(d) Autogamy (self-pollination) involve participation of just one flower for pollination. The devices for self pollination are homogamy, bisexuality, cleistogamy, etc.

Q9.   



  •  A-Two celled stage, B-Heart-shaped, C-Globular, D-Mature embryo
  •  A-Two celled stage, B-Mature embryo, C-Heart-shaped, D-Globular type
  •  A-Two celled stage, B-Globular type, C-Heart-shaped, D-Mature embryo
  •  A-Mature embryo, B-Heart-shaped, C-Globular type, D-Two celled stage
Solution



Q10.   Self-incompatibility is a device for I. Ensuring cross-pollination II. Preventing self-pollination III. Ensuring self-fertilisation IV. Genetic control for self-fertilisation Choose the correct statements from those given above
  •  I, II and III
  •  I, II, III and IV
  •  I, III and IV
  •  I, II and IV
Solution
(b) I, II, III and IV are correct Flowering plants have developed many devices to discourage self-pollination. In some species, pollen, releases and stigma receptibility is non-syncronised, i.e., either the pollen is released before the stigma becomes receptive or stigma becomes receptive much before the release of pollen. In some other species the anther and stigma are placed at the different positions so that the pollen can not come in contact with the stigma of same flower. Both these devices prevent autogamy. The third device to prevent inbreeding is self-incompatibility. This is genetic a mechanism and prevents self pollination (from same flower or other flower of same plant) from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in pistil


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