Q. No.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
modifications facilitate pollination by:
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
In an embryo sac, the cells that degenerate after fertilisation are:
1. Synergids and primary endosperm cell
2. Synergids and antipodals
3. Antipodals and primary endosperm cell
4. Egg and antipodals
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
In the embryos of a typical dicot and a grass, true homologous structures are:
| 1. | Coleorhiza and coleoptile | 2. | Coleoptile and scutellum |
| 3. | Cotyledons and scutellum | 4. | Hypocotyl and radical |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
The phenomenon observed in some plants wherein parts of the sexual apparatus are used for forming embryos without fertilisation is called
| 1. | Parthenocarpy | 2. | Apomixis |
| 3. | Vegetative propagation | 4. | Sexual reproduction |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
In a type of apomixis known as adventive embryony, embryos develop directly from:
1. Nucellus or integument
2. Zygote
3. Synergids of antipodals of embryo sac
4. Accessory embryo sac in the ovule
Parthenocarpic fruits are produced by:
| 1. | Treating plants with phenyl Mercuric acetate. |
| 2. | Treating plants with low concentrations of gibberellic acid and auxin. |
| 3. | Removing androecium of flowers before releasing pollen grains. |
| 4. | Raising plants from vernalised seeds. |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is:
| 1. | Cuticle | 2. | Sporopollenin |
| 3. | Lignin | 4. | Cellulose |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Perisperm differs from endosperm in:
| 1. | having no reserved food. |
| 2. | being a diploid tissue. |
| 3. | its formation by fusion of a secondary nucleus with several sperms. |
| 4. | being a haploid tissue. |
Which one of the following statements is not true?
| 1. | Pollen grains of some plants cause severe allergies and bronchial afflictions in some people. |
| 2. | The flowers pollinated by flies and bats secrete foul odour to attract them. |
| 3. | Honey is made by bees by digesting pollen collected from flowers. |
| 4. | Pollen grains are rich in nutrients, and they are used in the form of tablets and syrups. |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Flowers that have a single ovule in the ovary and are packed into inflorescence are usually pollinated by:
| 1. | Water | 2. | Bee |
| 3. | Wind | 4. | Bat |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
© 2024 GoodEd Technologies Pvt. Ltd.