PLA | MCQs

Explanation

• The large vacuole is a membrane-bound organelle found in plant cells that stores water, salts, sugars, and other substances.
• It plays a crucial role in maintaining cell turgor pressure, supporting cell growth, and storing nutrients and waste products.

Explanation

• Chloroplasts are organelles found in plant cells and some algae where photosynthesis takes place.
• Chlorophyll is the green pigment that absorbs light energy and plays a central role in this process.

Explanation

• Chlorophyll is a green pigment found in plants, algae, and cyanobacteria that plays a crucial role in photosynthesis.
• It traps sunlight and uses the energy to convert carbon dioxide and water into glucose and oxygen.

Explanation

• Small Vacuole because plant cells typically have a large central vacuole, not small vacuoles.

The components of a plant cell:

• Cell wall
• Cell membrane
• Cytoplasm
• Large vacuole
• Nucleus
• Chromosomes
• Chloroplast

Explanation

• In maize (Zea mays), the first structure to emerge from the seed during germination is the radical root.
• It is also known as the primary root.
• This root grows downward into the soil, anchoring the seedling and absorbing water and nutrients.

Explanation

• Plastic bottles are not biodegradable.
• As they are made from synthetic materials that are resistant to decomposition.
• It can take hundreds or thousands of years to break down.

Explanation

• Hypogeal germination occurs in monocotyledonous seeds (Monocot Seed).
• Where the cotyledon remains underground and the plumule emerges above the soil surface.
• Examples of monocot seeds include maize, wheat, rice, and grasses.

Explanation

• The requirement for light during seed germination varies among plant species.
• Some seeds, like peas and beans, can germinate in darkness (skototropism).
• While others, like lettuce and petunia, require light (photoblastism) to break seed dormancy and initiate germination.
• This is because light can trigger the production of hormones and enzymes essential for germination.

Explanation

• The optimal temperature range for seed germination varies among plant species, but most seeds germinate best between 16°C to 24°C (61°F to 75°F).
• This temperature range allows for optimal metabolic activity, water uptake, and enzyme activation, facilitating seedling emergence and growth.

Explanation

• Coleoptile is a protective sheath that covers the emerging plumule (shoot) in grasses, including maize (Zea mays).
• It is a characteristic feature of monocotyledonous plants, particularly in the family Poaceae (grass family).