Sexual Reproduction in Flowering Plants
Quiz-14
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. Non-albuminous seed
Solution
Non-albuminous seeds are also called ex-albuminous. In them reserve food consumed by embryo so their cotyledons are very thin
Non-albuminous seeds are also called ex-albuminous. In them reserve food consumed by embryo so their cotyledons are very thin
Q2.Wind pollinated flower have long well exposed stigma. This statement is
Solution
True, in wind pollination the stigma is large and open for more chances of pollination as there is no biotic agency for pollination
True, in wind pollination the stigma is large and open for more chances of pollination as there is no biotic agency for pollination
Q3. In the angiosperm ovule, central cell of the embryo sac, prior to the entry of pollen tube, contains
Solution
In angiosperms, the functional megaspore undergoes mitotic division and form 8 haploid nuclei. Out of which three micropylar cell (nuclei with cell wall) form egg apparatus, three chalazal cells from antipodal cells and the two central nuclei (polar nuclei) from central cell. These two polar nuclei fuse and form diploid secondary nucleus just before their fertilization by second male gamete. But prior to the entry of pollen tube, central cell generally contains two haploid polar nuclei.
In angiosperms, the functional megaspore undergoes mitotic division and form 8 haploid nuclei. Out of which three micropylar cell (nuclei with cell wall) form egg apparatus, three chalazal cells from antipodal cells and the two central nuclei (polar nuclei) from central cell. These two polar nuclei fuse and form diploid secondary nucleus just before their fertilization by second male gamete. But prior to the entry of pollen tube, central cell generally contains two haploid polar nuclei.
Q4. If stock contains 58 chromosomes and scion contains 30 chromosomes, Then how many chromosomes are present in root and egg cell of resultant plant respectively?
Solution
The plant part containing strong root system is called stock while the plant part containing better flower, fruit yield is called scion. The chromosome number remains same in root cells but reduced to half in egg cell.
The plant part containing strong root system is called stock while the plant part containing better flower, fruit yield is called scion. The chromosome number remains same in root cells but reduced to half in egg cell.
Q5.Function of tapetum is to provide
Solution
Nutrition. Microsporangium is mainly surrounded by four layers/wall, i.e., Epidermis, endothecium, middle layer and tapetuem.
Nutrition. Microsporangium is mainly surrounded by four layers/wall, i.e., Epidermis, endothecium, middle layer and tapetuem.
(i) Epidermis endothecium and middle layer help in protection and dehiscence of anther from pollen
(ii) Tapetum nourishes the developing pollen grain
Q6. Banana fruits are seedless, because
Solution
Genetic parthenocarpy is produced by mutation or hybridization. Most of banana varieties are triploid and triploidy is associated with seedlessness.
Genetic parthenocarpy is produced by mutation or hybridization. Most of banana varieties are triploid and triploidy is associated with seedlessness.
Q7. In some plants, anthers and stigmas grow and mature at same time. This phenomenon is called
Solution
Homogamy is the condition, in which male and female parts of a flower mature simultaneously
Homogamy is the condition, in which male and female parts of a flower mature simultaneously
Q8. Transfer of pollen grains from the anther to the stigma of another flower of the same plants is called
Solution
Geitonogamy (Gk : geiton = neighbour; gamein = to marry) involves the transfer of pollen grains from a male flower to the stigma of another female flower originating on the same plant
Geitonogamy (Gk : geiton = neighbour; gamein = to marry) involves the transfer of pollen grains from a male flower to the stigma of another female flower originating on the same plant
Q9. How many nuclei are found in female gametophyte?
Solution
Six out of the eight nuclei are surrounded by cell walls and organized into cells (egg cells and antipodal cells) and remaining two nuclei called polar nuclei are situated below the egg apparatus in large central cell. Thus, a typical angiospermic embryo sac at maturity is 8-nucleate and 7-celled. Mature embryo sac
Six out of the eight nuclei are surrounded by cell walls and organized into cells (egg cells and antipodal cells) and remaining two nuclei called polar nuclei are situated below the egg apparatus in large central cell. Thus, a typical angiospermic embryo sac at maturity is 8-nucleate and 7-celled. Mature embryo sac
Q10. Grafting is successful in dicots but not in monocots because the dicots have
Solution
In grafting technique, two parts of two related plants are joined, so as to form composite plant. In this, one plant having strong root system, is called stock, while the other having better shoot is called scion or graft. The grafting technique is successful in two related plants having vascular cambium (characteristic feature of dictoyledons). Later is absent in monocotyledons, so grafting cannot be possible in monocots.
In grafting technique, two parts of two related plants are joined, so as to form composite plant. In this, one plant having strong root system, is called stock, while the other having better shoot is called scion or graft. The grafting technique is successful in two related plants having vascular cambium (characteristic feature of dictoyledons). Later is absent in monocotyledons, so grafting cannot be possible in monocots.
