Quiz-11-Sexual-Reproduction-in-Flowering-Plants

 

Sexual Reproduction in Flowering Plants 

Quiz-11

Dear Readers,

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. Apomictic embryos in Citrus arise from

•  Synergids
•  Maternal sporophytic tissue in ovule
•  Antipodal cells
•  Diploid egg

Solution
In citrus, apomictic embryos arise from maternal sporophytic tissue in ovule.

Q2.True fruit is directly derived from

•  Stem
•  Root
•  Ovule
•  None of the above

Solution
In most of the species fruits are results of fertilization. There are few species in which fruits develop without fertilization. Such fruit are called parthenocarpic fruits. Banana is one such example. Parthenocarpy can be induced through application of growth hormones and such fruit are seed less

Q3.  Which of the following indicates correct names of A, B, C and D regions of the given diagram?

•  A– Male gamete B – Antipodals C – Egg cell D – Pollen tube
•  A –synergids B – Secondary nucleus C – Egg apparatus D – Integuments
•  A – Antipodals B – Male gametes C – Zygote D – Micropyle
•  A – Secondary nucleus B – Synergids C – Egg cell D – Integuments

Solution
A – Male gamete; B- Antipodal cells; C – Egg cell; D-Pollen tube. In angiosperms, the pollen tube carries two male gametes, one fuses with egg to produce zygote, while second fuses with secondary nucleus to produce triploid primary endosperm nucleus.

Q4. Identify A to G in following figure and answer accordingly

       

•  A-Ovary, B-Filament, C-Sepal, D-Petal, E-Style, F-Stigma, G-Anther
•  A-Petal, B-Ovary, C-Petal, D-Filament, E-Anther, F-Stigma, G-Style
•  A-Ovary, B- Sepal, C- Filament, D- Petal, E-Anther, F-Stigma, G-Style
•  A- Petal, B- Anther, C- Stigma, D- Style, E- Filament, F- Sepal, G- Ovary

Solution
  A-Ovary, B-Sepal, C-Filament, D-Petal, E-Anther, F-Stigma, G-Style

Q5.In the fully organised Polygonum type of embryo sac, what is the ratio of haploid, diploid and triploid   nuclei? 

•  3:1:3
•  6:0:1
•  6:1:0
•  3:2:3

Solution
 A fully organised Polygonum type of embryo sac in a 7-celled, 8-nucleate structure. The cells of egg appratus and antipodal are haploid, whereas the central cell is diploid, i.e., contains two polar nuclei. Triploid endosperm is formed after triple fusion, i.e, fusion of second male gamete with polar nuclei.

Q6. In a flowering plant, the pollen tube first arrives in

•  Egg
•  An antipodal cell
• A synergid
•  Central cell

Solution
The typical embryo sac (polygonum type) is 7-celled, 8-nucleate (two synergids, one egg, three antipodal and one central cell). The synergids are also known as helpers. They help in distribution of nutrients in embryo sac with the help of filiform apparatus and also help in attracting pollen tube towards egg.

Q7. Grass family (Poaceae) contains

•  Exposed stigma
•  Versatile anther
•  Both (a) and (b)
•  Large pollens

Solution
Flowers of grass family (Poaceae) are generally pollinated by the wind. They have exposed stigma and versatile anther

Q8. The ovule in which the funicle, chalaza and micropyle lie in one vertical plane, is called

•  Campylotropous
•  TAmphitropous
•  Orthotropous
•  Anatropous

Solution
The ovule in which the funicle, chalaza and micropyle lie on the vertical place is called orthotropous (Gk. Orthos = straight; tope = turned). In this type, the body of ovule is straight. Hilum and chalaza occur nearly. It is also called atropous or erect ovule, e.g., piperaceae, polygoniaceae, Urticaceae, etc. It is the most primitive and simplest type of ovule in angiosperms.

Q9. A longitudinal groove runs lengthwise separating the theca. This groove is called line of dehiscence. The above sentence is

•  True
•  False
•  Sometimes (a) and sometimes (b)
•  Neither (a) nor (b)

Solution
True. Because for releasing the pollens there are grooves, which separates the two theca and form line of dehiscence

Q10. Nuclear polyembryony is reported in

•  Citrus
•  Gossypium
•  Triticum
• Brassica

Solution
Occurrence of more than one embryo in a seed is reffered as Polyembryony. In many citrus and mango varieties some of the nucellar cells surrounding the embryo sac start dividing, protrude into embryo sac and develop into the embryos. In such species, each ovule contains many embryos (nucellar polyembryony)