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
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.
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.
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.
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 |
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.
© 2024 GoodEd Technologies Pvt. Ltd.