Sexual Reproduction in Flowering Plants
Quiz-15
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.
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Q1. Nuclear endosperm has
Solution
During the development of nuclear endosperm, the primary endosperm nucleus divides repeatedly without wall formation, i.e, produce large number of free nuclei. The multinucleate cytoplasm undergoes cleavage and gives rise to multicellular tissue, e.g., maize, wheat, rice, sunflower, etc.
During the development of nuclear endosperm, the primary endosperm nucleus divides repeatedly without wall formation, i.e, produce large number of free nuclei. The multinucleate cytoplasm undergoes cleavage and gives rise to multicellular tissue, e.g., maize, wheat, rice, sunflower, etc.
Q2.Parthenogenesis is a type of
Solution
Parthenogenesis is a type of asexual reproduction because it involves an unfertilized egg cell only.
Parthenogenesis is a type of asexual reproduction because it involves an unfertilized egg cell only.
Q3. Identify the characters with reference to the plant in which eight nucleated embryo sac was first
studied by strasburger.
I – Micropyle, chalaza and funiculus are arranged in the same vertical line in the ovule.
II– presence of both unisexual and bisexual flowers in the same plant.
III– Filiform apparatus helps in conduction of food materials from endosperm to egg apparatus.
IV– Long funiculus coils like a watch spring around the ovule.
Solution
Strasburger (1879) first time described Polygonum type of embryo sac on Polygonum divaricum. Orthotropous ovule is found in Polygonum. It is the simplest and primitive type, in which micropyle, chalaza and funiculus lie in one vertical plane.
Strasburger (1879) first time described Polygonum type of embryo sac on Polygonum divaricum. Orthotropous ovule is found in Polygonum. It is the simplest and primitive type, in which micropyle, chalaza and funiculus lie in one vertical plane.
Q4. Cleistogamous flowers are trictly autogamous because they remain
Solution
They remain close for ensuring self-pollination
They remain close for ensuring self-pollination
Q5.‘Sporopollenin is made up of organic material’. The above statement is
Solution
True. Pollen grain are generally 25-50 μm in diameter. Pollen grains have two main layers.
True. Pollen grain are generally 25-50 μm in diameter. Pollen grains have two main layers.
(i) Outer Layer It is also called exine. It is made up of sporopollenin. It is hard and protective in nature. Due to sporopollenin pollen can with stand extreme temperatures.
(ii) Inner layer It is also called intine. It is made up of cellulose and pectin. It is very thin as compared to the outer layer.
Q6. Anthesis is
Solution
Opening of flower is called anthesis
Opening of flower is called anthesis
Q7. Triploid tissue in angiosperms, is
Solution
In angiosperms, endosperm is the triploid (3n).
In angiosperms, endosperm is the triploid (3n).
Q8. Water pollination
Solution
Water pollinated plants are very less and limited to 30 genera and mostly are cotyledons. It is rare in flowering plants
Water pollinated plants are very less and limited to 30 genera and mostly are cotyledons. It is rare in flowering plants
Q9. Chalazal pole is present
Solution
Chalazal pole is present just, opposite to the micropylar end and chalaza represents the basal part of the ovule
Chalazal pole is present just, opposite to the micropylar end and chalaza represents the basal part of the ovule
Q10. Which one of following represents an ovule, where the embryo sac becomes horse-shoe shaped and the funiculus and micropyle are close to each other
Solution
In amphitropous ovule, the body of embryo becomes curved and looks like anatropous ovule but here the embryo sac also curves and becomes horse shoe shaped, e.g., Alismaceae.
In amphitropous ovule, the body of embryo becomes curved and looks like anatropous ovule but here the embryo sac also curves and becomes horse shoe shaped, e.g., Alismaceae.
