Class Test For Class 5

The statement is false because the seed coat actually plays a crucial role in protecting the seed and its internal parts. The seed coat acts as a barrier, preventing damage from external factors such as physical impact, pathogens, and dehydration. It also helps to regulate the germination process by controlling the entry of water and gases into the seed. Without the seed coat, the seed would be vulnerable and less likely to survive and successfully germinate.

Plant part 'B' is most likely the root of the plant. Roots are responsible for absorbing water and minerals from the soil, which are essential for the plant's growth and survival.

Seeds are dispersed far away from the parent plant to ensure the survival of new plants. This is because if the seeds were to remain close to the parent plant, they would have to compete for resources such as sunlight, water, and nutrients. By being dispersed far away, the seeds have a better chance of finding their own space and resources to grow. Additionally, dispersal helps to prevent overcrowding and inbreeding, as the seeds are able to colonize new areas and mix with different genetic material. Overall, seed dispersal is an important mechanism for the successful establishment and survival of new plants.

The gas given off by the leaves is oxygen. Leaves undergo a process called photosynthesis, where they use sunlight, water, and carbon dioxide to produce glucose and oxygen. The oxygen produced during photosynthesis is released into the atmosphere through tiny openings called stomata on the surface of the leaves. This oxygen is essential for the survival of many organisms, including humans, as it is used in the process of respiration.

Wheat is grown from November to April because it is a winter crop that requires cool temperatures for germination and growth. It is sown in November and harvested in April when the climate is suitable for its growth. Jowar and rice, on the other hand, are typically grown in different seasons and have different temperature and climate requirements.

Mangrove plants have seeds that are specifically adapted for dispersal by water. These seeds are buoyant and can float on the water's surface, allowing them to be carried by currents and tides to new locations. This method of dispersal is advantageous for mangroves as it helps them colonize new areas and maintain genetic diversity. Water dispersal also protects the seeds from desiccation and allows them to avoid competition with parent trees.

Cotyledons provide food to the baby plant inside the seed. Cotyledons are a part of the embryo in a seed and serve as a source of stored food. They provide the necessary nutrients for the developing plant until it can grow its own leaves and start photosynthesis. The seed coat protects the embryo but does not provide food, while roots are responsible for absorbing water and nutrients from the soil once the plant has germinated.

The outer protective covering on a seed is known as the seed coat. This coat serves as a barrier to protect the seed from mechanical damage, pathogens, and dehydration. It also helps in regulating the exchange of gases and water during germination. The seed coat plays a crucial role in seed dormancy, preventing the seed from germinating until the conditions are favorable for growth.

A new potato plant can be grown from a potato with an eye because the eye of a potato is a bud that has the potential to sprout and develop into a new plant. When a potato with an eye is planted in the soil, the eye will send out roots and shoots, eventually growing into a new potato plant. This process is commonly used in potato farming and gardening to propagate new potato plants.

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Chlorophyll is the pigment responsible for the green color in leaves. It plays a crucial role in photosynthesis, the process by which plants convert sunlight into energy. Chlorophyll absorbs light energy, particularly in the blue and red regions of the electromagnetic spectrum, while reflecting green light, giving leaves their characteristic color. This pigment is essential for plants to produce glucose and oxygen, which are vital for their growth and survival.

Seeds need air, water, and warmth for germination because air provides the necessary oxygen for respiration, water activates enzymes and facilitates biochemical reactions, and warmth helps to speed up the metabolic processes required for germination. These three factors are essential for the seed to break dormancy and begin the process of growth and development.

The arrow in the picture indicates the movement of water in the plant. Water is an essential component for plant growth and is transported through the plant's vascular system. This movement of water helps in the absorption of nutrients from the soil and their distribution to different parts of the plant.

The correct answer is "starch" because plants produce their own food through a process called photosynthesis. During photosynthesis, plants convert sunlight, water, and carbon dioxide into glucose, a type of sugar. Plants then store excess glucose in the form of starch, which serves as a long-term energy storage molecule. Starch is commonly found in various plant-based foods such as potatoes, rice, and wheat.

Cotyledons are the embryonic leaves of a seed that store food for the baby plant. They are found inside the seed and provide nutrients to the developing plant until it can produce its own food through photosynthesis. Cotyledons are an essential part of the seed's structure and play a crucial role in the early growth and development of the plant.

The stratosphere is the second major layer of Earth's atmosphere, located above the troposphere and below the mesosphere. It is characterized 1 by a stable temperature profile, 2 with increasing temperature with altitude due to the absorption of ultraviolet (UV) radiation by the ozone layer. The ozone layer, located within the stratosphere, plays a crucial role in protecting life on Earth by absorbing most of the Sun's harmful UV radiation.  

When a seed undergoes germination, it begins to grow and develop into a new plant. Germination is the process in which a seed starts to sprout and develop roots, stems, and leaves. This growth eventually leads to the formation of a mature plant. Therefore, the correct answer is "plant."

Kharif crops are the crops that are grown from June to October. These crops are specifically suited for the monsoon season and require a high amount of rainfall. They include crops like rice, maize, cotton, and soybean. Kharif crops are an important part of agricultural practices in many regions, as they provide food and raw materials for various industries.

Step farming is a traditional agricultural method that involves creating terraces or steps on steep slopes to cultivate crops. This technique is primarily employed in mountainous or hilly regions where flat land is limited. Therefore, the given statement that step farming is mainly used in plains is incorrect.

Iodine is the liquid used to test for starch. When iodine comes into contact with starch, it forms a bluish-black color. This reaction is used as a simple and effective test for the presence of starch in various substances.

A root is an underground plant part that is full of starch. Roots are responsible for absorbing water and nutrients from the soil, anchoring the plant in place, and storing reserve food in the form of starch. Starch is a complex carbohydrate that serves as an energy source for the plant. It is stored in specialized cells within the root called parenchyma cells. These cells contain large quantities of starch granules, which can be broken down and used by the plant when needed.

Rabi crops refer to the crops that are grown from November to April. These crops are sown in the winter season and harvested in the spring. They require cool weather and are dependent on the winter rainfall. Examples of Rabi crops include wheat, barley, mustard, peas, and gram.

Lotus, coconut, palm, mangrove, water lily, and water mint are some examples of seeds that are dispersed by water. The lotus plant produces seeds that are enclosed in a hard, waterproof covering, allowing them to float on water and be carried to new locations. Similarly, coconuts have a fibrous outer layer that helps them float in water and be transported by ocean currents to different areas. Both of these seeds have adaptations that enable them to disperse through water, increasing their chances of finding suitable growing conditions in new habitats.

The roots of plants absorb water and minerals from the soil. Water is essential for the plant's survival as it is involved in various metabolic processes such as photosynthesis and nutrient transport. Minerals, on the other hand, are necessary for the plant's growth and development. They are used as building blocks for various molecules and play a crucial role in enzyme activity and other biochemical reactions. Therefore, the correct answer is water and minerals.

Seeds require warmth, water, and air in order to germinate. Warmth provides the necessary temperature for the seed to activate its growth processes. Water is essential for initiating metabolic activities and softening the seed coat. Air is needed for respiration, allowing the seed to access oxygen for energy production. Without these three elements, the seed would not be able to begin the germination process and grow into a plant.

Begonia is the correct answer because it is a plant that can reproduce through leaf propagation. This means that a leaf from a Begonia plant can be cut and placed in soil, where it will develop roots and eventually grow into a new plant. Dandelion and Rose do not have this ability, as they primarily reproduce through seeds or other means.

The endosperm is a tissue within the seed that provides nourishment to the developing embryo. It contains stored food reserves, such as carbohydrates, proteins, and lipids, which are essential for the growth and development of the baby plant until it can produce its own food through photosynthesis.

During photosynthesis, plants use sunlight, carbon dioxide, and water to produce food. This food-making process occurs in the leaves of the plant and is called starch. Plants take in carbon dioxide from the air and release oxygen as a byproduct. They also require sunlight as an energy source for photosynthesis. Additionally, plants use up water that is taken from the soil during photosynthesis.

The correct answer for this question is "money plant" because it is a type of plant that can be grown from a stem cutting.

The process in which the fruit explodes to disperse the seeds is known as dispersal by fruit explosion.

The given answer options, wind, animal, and explosion, are all examples of agents of dispersal. Agents of dispersal refer to the various means by which seeds, spores, or other reproductive structures are spread or dispersed from their parent plant or organism. Wind is a common agent of dispersal for lightweight seeds that have adaptations such as wings or parachutes to be carried away by the wind. Animals can also aid in dispersal through their movement or consumption of seeds, which are then excreted in a different location. Explosion refers to the dispersal mechanism where plants have specialized structures that forcefully eject their seeds, such as in the case of some fruits or pods.

Poppy and violet are examples of seeds dispersed by fruit explosion. When the fruits of these plants mature, they dry out and split open forcefully, scattering the seeds in the process. This mechanism allows the seeds to be dispersed over a wide area, increasing their chances of finding suitable conditions for germination and growth. The explosion of the fruit helps the seeds to be dispersed by wind, water, or other external factors, aiding in their dispersal and colonization of new areas.

Xanthium and spear grass are examples of seeds dispersed by animals. Xanthium seeds have hooks or spines that attach to the fur or feathers of animals, allowing them to be carried to new locations. Spear grass, on the other hand, has seeds with barbs or bristles that can stick to the fur or clothing of passing animals, aiding in their dispersal. Both of these examples demonstrate how animals play a crucial role in the dispersal of seeds, helping plants colonize new areas and ensuring their survival.