Class XII Practical: Spotting

Objective

To identify and draw various biological specimens, slides, charts, and models, and infer their characteristics or principles.

Guidelines

For each item presented (slide, chart, model, or specimen):

Identification: Correctly identify the given item.
Drawing: Make a neat, labeled diagram of the identified item. For slides, draw what is observed under the microscope. For specimens/models, draw the external features. For charts, reproduce the key information.
Observation: Note down key observable features or structures.
Inference/Comment: Briefly explain the biological significance, function, or classification of the item.

Items for Spotting

Slides/Charts/Models

T.S. of mammalian ovary (prepared slide/model)
T.S. of mammalian testis (prepared slide/model)
Germinating pollen grain (prepared slide/chart)
Types of placentation (charts/models)
Mammalian blastula/blastocyst (prepared slide/model/chart)
Plasmodium sporozoite (prepared slide)
Entamoeba histolytica (prepared slide)
Ascaris specimen (specimen/model)

Adaptations

Xeric Plants/Animals: (Specimens/charts/models demonstrating adaptations to dry environments)
- Identify: The organism and its xeric adaptation(s).
- Draw: Labeled diagram showing the adaptation.
- Observation: Note features like thick cuticle, sunken stomata, water storage, burrowing habits, etc.
- Inference: Explain how the adaptation helps in water conservation or survival in arid conditions.
Aquatic Plants/Animals: (Specimens/charts/models demonstrating adaptations to aquatic environments)
- Identify: The organism and its aquatic adaptation(s).
- Draw: Labeled diagram showing the adaptation.
- Observation: Note features like aerenchyma, reduced roots, streamlined body, gills, webbed feet, etc.
- Inference: Explain how the adaptation helps in buoyancy, gas exchange, movement, or survival in water.

Pollination Types

Insect Pollination (Entomophily): (Flowers/charts/models showing features for insect attraction)
- Identify: Features indicating insect pollination (e.g., large, colorful petals, nectar guides, scent, sticky pollen).
- Draw: Labeled diagram of an insect-pollinated flower.
- Observation: Note the specific adaptations.
- Inference: Explain how these features facilitate pollination by insects.
Water Pollination (Hydrophily): (Plants/charts/models showing features for water pollination)
- Identify: Features indicating water pollination (e.g., small, inconspicuous flowers, pollen released on water surface, mucilaginous covering).
- Draw: Labeled diagram of a water-pollinated plant/flower.
- Observation: Note the specific adaptations.
- Inference: Explain how these features facilitate pollination by water.
Wind Pollination (Anemophily): (Plants/charts/models showing features for wind pollination)
- Identify: Features indicating wind pollination (e.g., small, inconspicuous flowers, no scent/nectar, large feathery stigmas, abundant light pollen).
- Draw: Labeled diagram of a wind-pollinated plant/flower.
- Observation: Note the specific adaptations.
- Inference: Explain how these features facilitate pollination by wind.

Guidelines

For each item presented (slide, chart, model, or specimen):

Identification: Correctly identify the given item.

Drawing: Make a neat, labeled diagram of the identified item. For slides, draw what is observed under the microscope. For specimens/models, draw the external features. For charts, reproduce the key information.

Observation: Note down key observable features or structures.

Inference/Comment: Briefly explain the biological significance, function, or classification of the item.

Items for Spotting

T.S. of mammalian ovary (prepared slide/model)

T.S. of mammalian testis (prepared slide/model)

Germinating pollen grain (prepared slide/chart)

Types of placentation (charts/models)

Mammalian blastula/blastocyst (prepared slide/model/chart)

Plasmodium sporozoite (prepared slide)

Entamoeba histolytica (prepared slide)

Ascaris specimen (specimen/model)

Xeric Plants/Animals: (Specimens/charts/models demonstrating adaptations to dry environments)

Identify: The organism and its xeric adaptation(s).
Draw: Labeled diagram showing the adaptation.
Observation: Note features like thick cuticle, sunken stomata, water storage, burrowing habits, etc.
Inference: Explain how the adaptation helps in water conservation or survival in arid conditions.

Aquatic Plants/Animals: (Specimens/charts/models demonstrating adaptations to aquatic environments)

Identify: The organism and its aquatic adaptation(s).
Draw: Labeled diagram showing the adaptation.
Observation: Note features like aerenchyma, reduced roots, streamlined body, gills, webbed feet, etc.
Inference: Explain how the adaptation helps in buoyancy, gas exchange, movement, or survival in water.

Insect Pollination (Entomophily): (Flowers/charts/models showing features for insect attraction)

Identify: Features indicating insect pollination (e.g., large, colorful petals, nectar guides, scent, sticky pollen).
Draw: Labeled diagram of an insect-pollinated flower.
Observation: Note the specific adaptations.
Inference: Explain how these features facilitate pollination by insects.

Water Pollination (Hydrophily): (Plants/charts/models showing features for water pollination)

Identify: Features indicating water pollination (e.g., small, inconspicuous flowers, pollen released on water surface, mucilaginous covering).
Draw: Labeled diagram of a water-pollinated plant/flower.
Observation: Note the specific adaptations.
Inference: Explain how these features facilitate pollination by water.

Wind Pollination (Anemophily): (Plants/charts/models showing features for wind pollination)

Identify: Features indicating wind pollination (e.g., small, inconspicuous flowers, no scent/nectar, large feathery stigmas, abundant light pollen).
Draw: Labeled diagram of a wind-pollinated plant/flower.
Observation: Note the specific adaptations.
Inference: Explain how these features facilitate pollination by wind.

Practical Guideline - Spotting

Class XII Practical: Spotting

Objective

Guidelines

Items for Spotting

Slides/Charts/Models

Adaptations

Pollination Types

On this page

Practical Guideline - Spotting

Class XII Practical: Spotting

Objective

Guidelines

Items for Spotting

Slides/Charts/Models

Adaptations

Pollination Types

On this page