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Rose plants produce large, attractive bisexual flowers, but th
Biology Exemplar
Biology Exemplar

Class 12

NCERT Exemplar

Publisher:
NCERT
Subject:
Biology
1

Chapter 1: Reproduction in Organisms

48 questions

Q1
Differentiate between (a) oestrus and menstrual cycles; (b) ovipary and vivipary. Give an example for each type.
Q2
Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.
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2

Chapter 2: Sexual Reproduction in Flowering Plants

52 questions

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3

Chapter 3: Human Reproduction

48 questions

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4

Chapter 4: Reproductive Health

37 questions

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5

Chapter 5: Principles of Inheritance and Variation

52 questions

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6

Chapter 6: Molecular Basis of Inheritance

71 questions

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7

Chapter 7: Evolution

52 questions

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8

Chapter 8: Human Health and Disease

70 questions

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9

Chapter 9: Strategies for Enhancement in Food Production

77 questions

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10

Chapter 10: Microbes in Human Welfare

59 questions

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11

Chapter 11: Biotechnology: Principles and Processes

48 questions

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12

Chapter 12: Biotechnology and its Applications

52 questions

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13

Chapter 13: Organisms and Populations

70 questions

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14

Chapter 14: Ecosystem

68 questions

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15

Chapter 15: Biodiversity and Conservation

61 questions

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16

Chapter 16: Environmental Issues

52 questions

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Question
Hard
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Solving time: 4 mins

Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.

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Biology Exemplar (NCERT Exemplar)

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Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.
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Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. The reasons for failure of fruit formation in rose are as follows
(i)  Rose plants may not produce viable pollens, hence, no fertilisation can take place.
(ii)  Rose plants may not have functional eggs.
(iii)  Rose plants may have defective and non-functional ovule ,which is the female gametophyte generator.
(iv)  There may be self-incompatibility.
(v)  There may be internal barriers for pollen tube growth or fertilisation.
(vi)  As rose plants are hybrids and reproduce vegetatively, there are chances for them to be sterile.
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Practice more questions from Biology Exemplar (NCERT Exemplar)

Q1
Differentiate between (a) oestrus and menstrual cycles; (b) ovipary and vivipary. Give an example for each type.
Q2
Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.
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The statements given below describe certain features that are observed in the pistil of flowers.
I.   Pistil may have many carpels.
II.  Each carpel may have more than one ovule.
III Each carpel has only one ovule.
IV. Pistil have only one carpel.
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Reproduction in Organisms

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Book:

Biology Exemplar (NCERT Exemplar)

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Question 2
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The number of taxa exhibiting asexual reproduction is drastically reduced in higher plants (angiosperms) and higher animals (vertebrates) as compared with lower groups of plants and animals. Analyse the possible reasons for this situation.
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Reproduction in Organisms

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Question 4
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Match the organisms given in column I with the vegetative propagules given in column II.
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Which of the following is false about external fertilization?
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The complete absence of one or more teeth (tooth agenesis) is a common trait in humans-indeed, more than of humans lack one or more of their third molars. However, more severe tooth agenesis, defined as the absence of six or more teeth, is less common and is frequently an inherited condition. L. Lammi and colleagues examined tooth agenesis in the Finnish family shown in the pedigree below. a. What is the most likely mode of inheritance for tooth agenesis in this family? Explain your reasoning.b. Are the two sets of twins in this family monozygotic or dizygotic twins? What is the basis of your answer?c. If IV-2 married a man who had a full set of teeth, what is the probability that their child would have tooth agenesis?d. If III-2 and III-7 married and had a child, what is the probability that their child would have tooth agenesis?
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Question Text
Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.
TopicReproduction in Organisms
SubjectBiology
ClassClass 12
Answer TypeText solution:1
Upvotes106