Test : Plant Life - 2 Class 5 Science MCQs & solutions - Free

(i) Nutrients: 
While nutrients are not immediately absorbed at the start of germination, they are essential for the subsequent growth of the seedling. 

(ii) Warmth: 
A suitable temperature is crucial; seeds need a certain range of warmth to germinate, and temperatures that are too low or too high can inhibit the process. 

(iii) Air: 
Oxygen is necessary for the seed to respire and generate energy for growth.

(iv) Water: 
Water is vital for activating enzymes and initiating the germination process by softening the seed coat and allowing it to absorb oxygen. 

• Avoid Over-Crowding: Dispersal prevents competition for resources like sunlight, water, and nutrients, promoting healthier growth.
• Independence from Parent Plant: Seeds dispersed away from the parent plant reduce resource competition and avoid diseases and pests that may affect the parent plant.
• Spread to New Areas: Dispersal allows plants to colonize new areas, increasing their distribution and genetic diversity, which enhances their ability to adapt to changing environments.

Thus, the correct answer is C: (i), (ii), and (iii).

The correct match of seed and its means of dispersal is: C. Cotton seeds - Air
- Cotton seeds are lightweight and have structures called trichomes, which are hair-like projections that help them catch the wind and get dispersed.
- The air currents carry the cotton seeds to new locations, allowing them to spread over large distances.
- This method of dispersal is known as anemochory, or wind dispersal.
- Cotton seeds are not dispersed by water (Pomegranate - water) or animals (Coconut - Animal, Pea - Animal).
Therefore, the correct pair is C: Cotton seeds - Air.

To classify the given crops in Rabi and Kharif, we need to understand the cropping seasons of these crops. Rabi crops are sown in winter (November-December) and harvested in spring (April-May), while Kharif crops are sown at the beginning of the monsoon season (June-July) and harvested in autumn (September-October). Based on this information, we can classify the given crops as follows:
Classification of crops:
- Wheat: Rabi
- Maize: Kharif
- Bajra: Kharif
- Gram: Rabi
Therefore, the correct classification of the given crops in Rabi and Kharif is:
Answer: A
- (i) Wheat - Rabi
- (ii) Maize - Kharif
- (iii) Bajra - Kharif
- (iv) Gram - Rabi

Dispersal refers to how seeds, plants, and animals can move from one place to another. Here are the main agents of dispersal:

• Air: Wind can carry seeds and small organisms over long distances.
• Water: Seeds can float on water and travel to new areas, like rivers and oceans.
• Animals: Animals can help in dispersal by eating fruits and spreading seeds through their droppings.

All of these methods—air, water, and animals—are important for spreading plants and seeds to new locations, making option D the correct choice.

Roots play an important role in the growth of plants. Here’s what they do:

• Absorb water: Roots take in water from the soil, which is essential for the plant's survival.
• Hold the plant: Roots anchor the plant firmly in the soil, preventing it from falling over.
• Absorb minerals: Roots also take in important minerals from the soil that help the plant grow.
• Roots do not make food for the plant; this job is done by the leaves through a process called photosynthesis.

Therefore, the correct options are those that mention the roles of roots in absorbing water and minerals, and holding the plant in place.

The different parts of a plant, such as seeds, stems, leaves, and spores, play important roles in its growth.

• Seeds contain stored food that helps them grow into new plants.
• Stems support the plant and carry water and nutrients.
• Leaves are where the plant makes food using sunlight, air, and water.
• Spores can help the plant spread and grow in new places.

Among these, the correct statement is that they can grow into new plants when given the right conditions.