Q. No.A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is:
1.
Plant is dioecious and bears only pistillate flowers.
2.
Plant is dioecious and bears both pistillate and staminate flowers.
3.
Plant is monoecious.
4.
Plant is dioecious and bears only staminate flowers.
The outermost and innermost wall layers of microsporangium in an anther are respectively:
1. Endothecium and tapetum
2. Epidermis and endodermis
3. Epidermis and middle layer
4. Epidermis and tapetum
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During microsporogenesis, meiosis occurs in:
| 1. | Endothecium | 2. | Microspore mother cells |
| 3. | Microspore tetrads | 4. | Pollen grains |
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From among the sets of terms given below, identify those that are associated with the gynoecium.
| 1. | Stigma, ovule, embryo sac, placenta |
| 2. | Thalamus, pistil, style, ovule |
| 3. | Ovule, ovary, embryo sac, tapetum |
| 4. | Ovule, stamen, ovary, embryo sac |
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Starting from the innermost part, the correct sequence of parts in an ovule are:
| 1. | egg, nucellus, embryo sac, integument |
| 2. | egg, embryo sac, nucellus, integument |
| 3. | embryo sac, nucellus, integument, egg |
| 4. | egg, integument, embryo sac, nucellus |
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From the statements given below, choose the option that is true for a typical female gametophyte of a flowering plant:
| I: | It is 8-nucleate and 7-celled at maturity |
| II: | It is free-nuclear during the development |
| III: | It is situated inside the integument but outside the nucellus |
| IV: | It has an egg apparatus situated at the chalazal end |
| 1. | I and IV | 2. | II and III |
| 3. | I and II | 4. | II and IV |
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Autogamy can occur in a chasmogamous flower if:
1. Pollen matures before the maturity of ovule.
2. Ovules mature before the maturity of pollen.
3. Both pollen and ovules mature simultaneously.
4. Both anther and stigma are of equal lengths.
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Choose the correct statement from the following:
| 1. | Cleistogamous flowers always exhibit autogamy |
| 2. | Chasmogamous flowers always exhibit geitonogamy |
| 3. | Cleistogamous flowers exhibit both autogamy and geitonogamy |
| 4. | Chasmogamous flowers never exhibit autogamy |
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A particular species of the plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These
modifications facilitate pollination by:
| 1. | Insects | 2. | Water |
| 3. | Wind | 4. | Animals |
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From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
| 1. | Monoecious plant bearing unisexual flowers |
| 2. | Dioecious plant bearing only male or female flowers |
| 3. | Monoecious plant with bisexual flowers |
| 4. | Dioecious plant with bisexual flowers |
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