Explanation

• Tissue death can occur naturally or due to injury, infection, or stress.
• Necrosis is the death of living tissues, often uncontrolled.

Additional information:

• Apoptosis is programmed cell death, a controlled process at the cellular level.
• Plasmolysis is shrinkage of plant cells due to water loss.

Last verified on 23-01-2026

Explanation

• Plants can respond to various stimuli like light, gravity, and touch.
• The response of plants to touch is called thigmotropism.
• It is commonly seen in climbing plants and vines, which coil around supports.

Last verified on 23-01-2026

Explanation

• Developed countries are highly industrialized with advanced urban infrastructure.
• On average, it is about 15% in developed countries.

Additional information:

• Examples of developed countries: USA, UK, Japan, Germany.
• High urbanization is due to industrialization and better job opportunities in cities.

Last verified on 23-01-2026

Explanation

• Oomycetes are fungus-like organisms, often called water molds.
• Although they resemble true fungi, their cell wall composition is different.
• In oomycetes, the cell wall is mainly composed of cellulose.

Additional information:

• True fungi have chitin in their cell walls, while oomycetes have cellulose.
• A common example of oomycetes is Phytophthora, which causes plant diseases.

Last verified on 23-01-2026

Explanation

• Inflorescence refers to the arrangement of flowers on a plant.
• Safflower (Carthamus tinctorius) belongs to the family Asteraceae.
• Plants of this family typically bear flowers in a capitulum (head) type inflorescence.

Additional information:

• Capitulum is also called a head inflorescence.
• Common examples: sunflower, marigold, and safflower.

Last verified on 23-01-2026

Explanation

• Plant growth regulators control growth, development, and responses in plants.
• Abscisic acid (ABA) is a growth-inhibiting hormone.
• It suppresses root and leaf growth and helps plants respond to stress conditions.

Additional information:

• ABA is known as the stress hormone of plants.
• It causes stomatal closure during drought to reduce water loss.

Last verified on 23-01-2026

Explanation

• Sugar beet can develop a rotten smell when it undergoes microbial breakdown.
• This smell is caused by fermentation, where microorganisms convert sugars into alcohols, acids, and gases.

Additional information:

• Fermentation can spoil sugar beet if not processed quickly after harvest.
• Microorganisms like yeast and bacteria are responsible for this smell.

Last verified on 22-01-2026

Explanation

• Exhaustive crops are crops that remove large amounts of nutrients from the soil.
• Continuous cultivation of these crops can deplete soil fertility.
• Examples include nutrient-demanding cereal crops like maize, wheat, and rice.

Additional information:

• Maize, wheat, and rice remove large amounts of nitrogen, phosphorus, and potassium from the soil.

Last verified on 22-02-2026

Explanation

• Potato cultivation requires planting healthy seed tubers at the recommended seed rate for optimum yield.
• Recommended seed rate is 800–1200 kg per hectare.

Additional information:

• Seed tubers should be disease-free and healthy.
• Planting is done at 25–30 cm spacing between tubers for best results.

Last verified on 20-01-2026

Explanation

• The cell cycle is the sequence of stages a cell goes through to grow and divide.
• DNA synthesis (replication) occurs during the S Phase (Synthesis Phase).

Additional information:

1. G₁ Phase – cell growth before DNA replication
2. G₂ Phase – preparation for cell division after DNA replication
3. M Phase – actual mitosis/cell division

Last verified on 22-01-2026