Test : Plant Life - 3 - Class 5 MCQ

Explanation:
The correct answer is B: Cotyledons.
- Cotyledons are also known as seed leaves.
- Cotyledons are part of the embryo within the seed of a plant.
- They are the first leaves to appear during germination and play a crucial role in providing nutrients to the growing seedling.
- Cotyledons can vary in size, shape, and number depending on the plant species.
- They can either remain underground or emerge above the soil surface.
- Cotyledons are usually green and capable of photosynthesis, allowing the seedling to produce its own food until true leaves develop.
- Once the true leaves appear, the cotyledons usually wither and fall off.
- The number and arrangement of cotyledons can be used to classify plants into different groups, such as monocots (one cotyledon) and dicots (two cotyledons).
In summary, cotyledons are the seed leaves of a plant that provide nourishment to the seedling until it can photosynthesize on its own.

Black soils are most suitable for the cotton crop hence it is also known as black cotton soil. Besides cotton, the soil is suitable for the cultivation of crops like wheat, groundnut, chillies, tobacco and jowar.

Sugarcane reproduction by stem cutting
Sugarcane is a perennial grass that reproduces asexually through stem cuttings. This means that new plants can be grown from sections of the stem. Here is a detailed explanation of how sugarcane reproduces through stem cutting:
1. Selection of the stem: A healthy and mature sugarcane plant is selected for stem cutting. The stem should be free from any disease or damage.
2. Preparation of the stem: The stem is cut into sections, typically around 2-3 feet long. Each section should have at least one bud or node present.
3. Planting the stem: The cut sections of the stem are then planted in the soil. They are usually planted horizontally or at a slight angle to encourage better root development.
4. Root and shoot formation: The planted stem sections start developing roots from the nodes. Simultaneously, shoots emerge from the buds present on the stem.
5. Growth and development: As the roots and shoots grow, a new sugarcane plant is formed. The shoots develop into new stalks, while the roots provide the necessary nutrients and water for growth.
6. Harvesting: Sugarcane plants grown from stem cuttings take several months to reach maturity. Once the stalks have reached the desired size and sugar content, they are harvested for processing into sugar or other sugarcane products.
In conclusion, sugarcane reproduces through stem cuttings, where sections of the stem are planted in the soil, leading to the development of new plants with root and shoot growth.

Answer:

A new plant in a mushroom can be grown from the spore of the plant. Here is a detailed explanation:

• Spore: Spores are the reproductive cells of fungi, including mushrooms. They are produced in large quantities and are dispersed by wind or other means.


• Growth: When a spore lands in a suitable environment, it can germinate and grow into a new plant. The spore absorbs water and nutrients from its surroundings and develops into a mycelium.


• Mycelium: The mycelium is a network of thread-like structures called hyphae. It grows underground or within the substrate, such as decaying wood or soil.


• Fruiting Body: As the mycelium matures, it forms a fruiting body, which is the visible part of the mushroom. This is the part that we typically associate with a mushroom.


• Spore Production: Within the fruiting body, specialized cells called basidia produce spores through a process called meiosis. These spores are then released into the environment to start the cycle again.

Therefore, in a mushroom, a new plant can be grown from the spore of the plant.

Farmers should use insecticides to protect their crops from insects. However, the overuse of insecticides can be harmful to the soil and human health.

- Among the options given, the plant that has an underground stem is Ginger (Option B).
- Ginger is a rhizome, which means its stem grows horizontally underground.
- The ginger plant stores nutrients and produces shoots and roots from its underground stem.
Eliminating other options:
- Sugarcane (Option A) does not have an underground stem. It has a tall, upright stem known as a culm.
- Hibiscus (Option C) does not have an underground stem. It has an upright stem that grows above the ground.
- Rose (Option D) does not have an underground stem. It has a woody stem that grows above the ground.
Conclusion:
- The correct answer is Ginger (Option B) as it is the only plant among the options given that has an underground stem or rhizome.

Plants that can be grown from the roots of a plant:
- Potato: Potatoes are not grown from the roots of a plant. They are grown from the tubers of the potato plant.
- Ginger: Ginger is grown from the rhizomes of the ginger plant, which are underground stems, not roots.
- Sweet potato: Sweet potatoes can be grown from the roots of a plant. When a sweet potato is planted, new roots will develop, and new sweet potatoes will grow from these roots.
- Sugarcane: Sugarcane is not grown from the roots of a plant. It is grown from stem cuttings or pieces of the stalks.
Therefore, the correct answer is option C: Sweet potato.

The correct answer is B: (i - C), (ii - A), (iii - D), (iv - B).

- (i - C): This matches the first option with the third item in the second column.
- (ii - A): This pairs the second option with the first item in the second column.
- (iii - D): This links the third option with the fourth item in the second column.
- (iv - B): This associates the fourth option with the second item in the second column.

Each pair aligns correctly, ensuring the relationships between the items are accurately represented.

The correct answer is C: Winter. Crops grown in the winter season are known as rabi crops. Rabi crops are typically sown in October and November and harvested in April and May. These crops require cool temperatures and a sufficient amount of water for their growth. Some examples of rabi crops include wheat, barley, mustard, gram, and peas.
Here is a detailed explanation of the given options:
- A: Summer: Summer crops are known as kharif crops, not rabi crops.
- B: Autumn: Autumn is not a specific season for crop cultivation. It is a transition period between summer and winter.
- C: Winter: Correct answer. Crops grown in the winter season are known as rabi crops.
- D: Spring: Spring crops are also known as zaid crops, not rabi crops.
- E: None of these: The correct answer is option C, winter.
To summarize, rabi crops are grown in the winter season and include crops like wheat, barley, mustard, gram, and peas.

Stem Cuttings:
- Stem cuttings are a common method of plant propagation.
- Certain plants can be grown from stem cuttings, where a section of the stem is cut from the parent plant and then planted to grow a new plant.
- Stem cuttings can be taken from the stems of various plants and can result in successful growth.
Options:
A: Carrot:
- Carrots are root vegetables, and they do not grow from stem cuttings. They are typically grown from carrot seeds or carrot tops.
B: Radish:
- Radishes are root vegetables, and they do not grow from stem cuttings. They are typically grown from radish seeds.
C: Turnip:
- Turnips are root vegetables, and they do not grow from stem cuttings. They are typically grown from turnip seeds.
D: Potato:
- Potatoes can be grown from stem cuttings.
- The stem of a potato plant, also known as a tuber, can be cut into sections, each containing at least one "eye" or bud, and planted to grow a new potato plant.
E: None of these:
- This option is incorrect, as potatoes can be grown from stem cuttings.
Conclusion:
- Among the given options, only potatoes can be grown from stem cuttings.
- The correct answer is D: Potato.

Fencing involves enclosing the fields to prevent grazing animals such as goats, cows, and buffaloes from accessing the crops.

The eyes of potato are:

• Leaves: No, the eyes of a potato are not leaves. They are small indentations on the surface of the potato.


• Buds: Yes, the eyes of a potato are actually dormant buds. These buds have the potential to grow into new potato plants.


• Roots: No, the eyes of a potato are not roots. The roots of a potato plant grow from the bottom of the potato, not from the eyes.


• Flowers: No, the eyes of a potato do not develop into flowers. They are specifically buds that have the potential to sprout into new potato plants.


• None of these: The correct answer is "b" - buds. The eyes of a potato are actually the buds that have the potential to grow into new potato plants.

To summarize, the eyes of a potato are dormant buds that have the potential to grow into new potato plants, not leaves, roots, or flowers.

Organic fertilizers are derived from natural sources such as decaying plants, animal dung, and other organic matter.

Fertilization is the process of adding nutrients to the soil to make it richer and support the growth of crops. This can be done using organic or inorganic fertilizers.

India, the season is popularly considered to start in June and end in October.^[4] Kharif crops are usually sown at the beginning of the first rains during the advent of the south-west monsoon season, and they are harvested at the end of monsoon season (October–November).