Last Updated on December 15, 2024 by XAM CONTENT
Hello students, we are providing case study questions for class 12 biology. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 12 biology. In this article, you will find case study questions for cbse class 12 biology chapter 1 Sexual Reproduction in Flowering Plants. It is a part of case study questions for class 12 biology series.
| Chapter | Sexual Reproduction in Flowering Plants |
| Type of Questions | Case Study Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 12 |
| Subject | Biology |
| Useful for | Class 12 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 12 Biology Chapterwise Case Study |
Case Study Questions on Sexual Reproduction in Flowering Plants
Questions
Question 1:
Read the following and answer the questions given below:
Pollen-Pistil Interaction
Pollen-pistil interaction is the group of events that occur from the time of pollen deposition over the stigma to the time of pollen tube entry into ovule. It is a dynamic process which has checks at several places for promotion or inhibition of pollen growth. Pollen-pistil interaction is a safety measure to ensure that illegitimate crossings do not occur. Compatibility and incompatibility of the pollen-pistil is determined by special proteins. The compatible pollens are able to absorb water and nutrients from the surface of the stigma. They germinate and produce pollen tubes. Pollen tubes grow into the style. Their growth and path through the style are also determined by specific chemicals.
Q1. Which of the following parts of gynoecium determines the compatible nature of pollen?
a. Stigma
b. Style
c. Ovary
d. Thalamus
Difficulty Level: Medium
Ans. Option (a) is correct.
Q 2. In Trifolium, which type of self-incompatibility is found?
a. Gametophytic Self-Incompatibility (GSI)
b. Sporophytic Self-Incompatibility (SSI)
c. Both GSI and SSI
d. None of the above
Difficulty Level: Medium
Ans. Option (a) is correct.
Q 3. Select the incorrect statement:
a. In Asteraceae, incompatibility is due to the genotype of the sporophytic stigmatic tissues.
b. In members of Brassicaceae, incompatibility is due to the genotype of the pollen.
c. Nature has imposed self-incompatibility to avoid highly homozygous individuals which have a very low survival value.
d. None of the above
Difficulty Level: Medium
Ans. Option (b) is correct.
Q 4. Which of the following are examples of self-incompatibility?
a. Tobacco
b. Potato
c. Crucifers
d. All of these
Difficulty Level: Medium
Ans. Option (d) is correct.
Q 5. Given figures show the pollen-stigma interaction, where pollen wall proteins are released onto the pellicle of stigmatic papillae, where recognition reaction occurs.
Which of the following statements drawn from given figures is incorrect?
a. P indicates compatible reaction in which the pollen tube penetrates the cuticle and grows down the papilla.
b. Development of callose plug between the plasma membrane and pectocellulosic layer of stigmatic papillae results in the incompatibility
reaction in Q.
c. A callose plug which appears at the tip of pollen in Q, is dissolved by callose enzyme secreted by stigma resulting in compatibility reaction.
d. Deposition of callose can be employed as a reliable bioassay to detect compatibility or incompatibility reactions of pollen and stigma.
Difficulty Level: Medium
Ans. Option (c) is correct.
Question 2:
Read the following passage and answer questions:
Transfer of pollen grains (from anther) to the stigma of a pistil is termed pollination. Flowering plants have evolved an amazing array of adaptations to achieve pollination. They make use of external agents to achieve pollination. In Autogamy pollination is achieved within the same flower. Transfer of pollen grains from the anther to the stigma of the same flower. Geitonogamy is transfer of pollen grains from anther to stigma of another flower of the same plant. Xenogamy is transfer of pollen grains from anther to stigma of a different plant. Plants use two abiotic (wind and water) and one biotic (animals) agents to achieve pollination. Majority of plants use biotic agents for pollination. Only a small proportion of plants use abiotic agents.
Q. 1. Pollination between two flowers present on same plant is called _______
a) Geitonogamy
b) Xenogamy
c) Autogamy
d) Dichogamy
Difficulty Level: Medium
Ans. Option (a) is correct.
Q. 2. The type of pollination in dioecious plants is _______
a) Herkogamy
b) Autogamy
c) Geitonogamy
d) Xenogamy
Difficulty Level: Medium
Ans. Option (d) is correct.
Q. 3. In water hyacinth pollination takes place by _______
a) Water
b) Wind
c) Wind or Insects
d) Birds
Difficulty Level: Medium
Ans. Option (c) is correct.
Q. 4. Morphologically cross pollination but genetically self-pollination _______
a) Xenogamy
b) Geitonogamy
c) Autogamy
d) Cleistogamy
Difficulty Level: Medium
Ans. Option (b) is correct.
Question 3:
Read the following passage and answer questions:
Artificial hybridisation is one of the major approaches of crop improvement programme. In such crossing experiments it is important to make sure that only the desired pollen grains are used for pollination and the stigma is protected from contamination (from unwanted pollen). This is achieved by emasculation and bagging techniques.
Q. 1. Removal of anthers from a bisexual flower is called ______
a) Emasculation
b) Selection
c) Bagging
d) Acclimatization
Difficulty Level: Easy
Ans. Option (a) is correct.
Q. 2. The events in artificial hybridization programmes which avoids unwanted cross pollination and self-pollination respectively-
I. Bagging
II. Emasculation
III. Rebagging
IV. Artificial cross pollination
a) I & II
b) II & 1
c) IV & ॥
d) II & III
Difficulty Level: Easy
Ans. Option (a) is correct.
Q. 3. Bagging prevents ________
a) Desired self pollination
b) Undesired self pollination
c) Desired cross pollination
d) Undesired cross pollination
Difficulty Level: Easy
Ans. Option (d) is correct.
Q. 4. Which of the following is the correct sequence for artificial experiment in bisexual flowers?
a) Self-pollination -> Bagging -> Emasculation -> Rebagging
b) Cross pollination -> Bagging -> Emasculation -> Rebagging
c) Emasculation -> Bagging -> Cross pollination -> Rebagging
d) Bagging -> Emasculation -> Cross pollination -> Rebagging
Difficulty Level: Medium
Ans. Option (c) is correct.
Question 4:
Pollination
In angiosperms, the pollen grains are being transferred from the anther to the stigma and is termed pollination. This phenomenon was first discovered by Camerarius (1694) in the end of seventeenth century. Pollen grains are immobile. They cannot reach the stigma by themselves. An external agent is required for this. The pollination is mainly of two types: self-pollination and cross-pollination.
The diagram given below shows two plants of the same species showing different types of pollination.
Q 1. What do you mean by pollination?
Difficulty Level: Medium
Ans. Transfer of pollen grain from the anther to the stigma of the carpel is called pollination.
Q 2. Who discovered pollination phenomenon?
Difficulty Level: Easy
Ans. The phenomenon was first discovered by Camerarius in 1694.
Q 3. What is transferred between the plants in the process indicated by arrow P?
Difficulty Level: Medium
Ans. Here, transfer of pollen takes place.
Q 4. Write the name of processes P, Q and R indicated in the above figure.
Difficulty Level: Medium
Ans. P – Geitonogamy
Q – Xenogamy
R – Autogamy
Also check
- Reproductive Health Class 12 Case Study Questions Biology Chapter 3
- Human Reproduction Class 12 Case Study Questions Biology Chapter 2
- Sexual Reproduction in Flowering Plants Class 12 Case Study Questions Biology Chapter 1
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Topics from which case study questions may be asked
- Flower Structure
- Development of Male Gametophyte
- Development of Female Gametophyte
- Pollination
- Outbreeding Devices
- Pollen-Pistil Interaction
- Double Fertilisation
- Post-Fertilisation Events
- Special Modes of Reproduction
- Significance of Seed Dispersal and Fruit Formation
Case study questions from the above topics may be asked.
Frequently Asked Questions (FAQs) on Sexual Reproduction in Flowering Plants Case Study Questions
Q1: What are case study questions for CBSE examinations?
A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.
Q2: Why are case study questions important for understanding class 12 biology chapters?
A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.
Q3: How should students approach answering case study questions for CBSE?
A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.
Q4: Are there any resources available online for students to practice case study questions on class 12 biology chapters for CBSE exams?
A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.
Q5: How can students effectively prepare for case study questions on Sexual Reproduction in Flowering Plants for CBSE exams?
A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.
Q6: How can teachers incorporate case study questions on Sexual Reproduction in Flowering Plants class 12 biology into classroom teaching?
A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of Sexual Reproduction in Flowering Plants.
Q7: State the function of filiform apparatus found in mature embryo sac of an angiosperm.
Ans. The filiform apparatus guides the pollen tube into the synergid.
Q8: What is the function of the pollen tube?
A8: Pollen tube acts as a conduit to transport male gametes from the stigma to the ovule.
Q9: What is entomophily?
A9: Pollination of a flower in which the pollen is carried by an insect is called entomophily.
Q10: How is it possible in Oxalis and Viola plants to produce assured seed-sets even in the absence of
pollinators?
A10: Assured seed-sets are possible to be produced in Axalis and Viola Plants by the presence of cleistogamous flowers.
Q11: The meiocyte of rice has 24 chromosomes. How many chromosomes are present in its endosperm?
A11: 36 chromosomes are present in its endosperm.
Q12: How do flowers of Vallisneria get pollinated?
A12: In Vallisneria, the female flower stalk is coiled to reach the water surface for receiving the pollen grains carried by water currents.
Q13: Define parthenocarpy.
A13: Parthenocarpy is the production of fruits without fertilisation of ovules. Fruits like banana and figs are developed without fertilisation and do not produce any viable seeds. A parthenocarpic fruit is devoid of embryo and endosperm and therefore does not have any seeds. That is why they are also known as seedless or virgin fruits.
Q14: Name the product of fertilisation that forms the kernel of coconut. How does the kernel differ from coconut water?
A14: Endosperm forms the kernel of coconut. The coconut water is free-nuclear endosperm, whereas kernel is cellular endosperm.
