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Posted by Archana .. 3 years, 11 months ago
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Reasons for introducing *** education as compulsory part of school curriculum are as follows:
- To provide information about reproductive organs-physiology and their functioning.
- It helps in discouraging myths and misconceptions about ***-related aspects.
- It provides knowledge about safe and hygienic sexual practices.
- Adolescents get knowledge about secondary sexual characters.
- It helps in prevention of Sexually Transmitted Infections like AIDS.
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Posted by Mahek Patel 3 years, 11 months ago
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Mendel's seminal work was accomplished using the garden pea, Pisum sativum, to study inheritance. This species naturally self-fertilizes, meaning that pollen encounters ova within the same flower. The flower petals remain sealed tightly until pollination is completed to prevent the pollination of other plants.
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Family planning is "the ability of individuals and couples to anticipate and attain their desired number of children and the spacing and timing of their births. If sexually active, family planning may involve the use of contraception and other techniques to control the timing of reproduction.
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Population- is a group of individuals of the same species sharing or competing for similar resources in a defined geographical area.
Population Education as defined by UNESCO “is an educational programme which provides for a study of the population situation of the family , community, nation and the world, with the purpose of developing in the students rational and responsible attitudes and behaviour towards that situation.”
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Posted by Pawan Kumar 3 years, 11 months ago
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The ***-linked genetic 'red-green color blindness' affects 'males much more than females'.
Explanation:
- The genes like 'red and green color' receptors are located in X chromosomes of which males have only one female.
- The color blindness is responsible for the condition carried on the 'X chromosome' and hence the men population is affected more than females.
- On cross XHXh (Mother Carrier)and XHY(Unaffected Father), the four possibilities are obtained XHXH (Daughter unaffected), XHXh( Daughter unaffected), XHY(Half son unaffected), XhY (half soon have hemophilia)
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Seed Germination is the process of seeds developing into new plants. First, environmental conditions must trigger the seed to grow.
1. Hypogeal Germination: In this kind of germination, the cotyledons do not come out of the soil surface. In such seeds the epicotyl (i.e., part of embryonic axis between plumule and cotyledons) elongates pushing the plumule out of the soil.
2. Epigeal Germination: In seeds with epigeal germination, the cotyledons are brought above the soil due to elongation of the hypocotyl. In castor, cotton, papay, onion , flat green leaf like cotyledons can be seen in the young seedlings. Here the cotyledons, besides food storage, also perform photosynthesis till the seedling becomes independent. In some other plants like bean, the cotyledons being thick, do not become leaf-like; they shrival and fall off after their food reserves are consumed by the seedling.
3. Vivipary (Viviparous Germination): Vivipary is the phenomenon of giving birth to young ones in advanced stage of development. It occurs in mammals (among animals) and mangrove plants. In mangrove plants (e.g., Rhizophora, Sonneratia, Heritiera) the seeds cannot germinate on the ground because of the excessive salt content and lack of oxygen in marshy habitat. In such plants seed dormancy is absent.
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| Parameter | Angiosperms | Gymnosperms |
| Definition | These are seed-producing flowering plants whose seeds are enclosed within an ovary. | These are seed-producing non-flowering plants whose seeds are unenclosed. |
| Seeds | Their seeds are enclosed inside an ovary, usually in a fruit. | Their seeds are bare and not enclosed, which are found on scales, leaves, or as cones. |
| Life Cycle | The lifecycle of these plants is seasonal because these die during autumn/fall. | These plants are evergreen in nature. |
| Presence | These are present in flowers and can be unisexual or bisexual. | These are present as cones and are unisexual. |
| Reproduction | Reproduction is depending on the animals for spread. | Here, Reproduction is depending on wind for spread. |
| Tissue | These have triploid tissue. | These have haploid tissue. |
| Leaves | The shape of the leaves is flat. | Their leaves are scale-like and needle-like. |
| Wood | These have hardwood. | These have softwood. |
| Uses | Used for Medications, food, clothing, etc. | Used for Paper, Lumber, etc. |
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Geetanjali Sereginedi 4 years, 1 month ago
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