Question

Чем отличается прорастание семян двудольных и однодольных растений??

Answer 1

Ответ:

У двудольных растений зародыш содержит две семядоли, а запасные питательные вещества обычно находятся либо в самом зародыше, либо в эндосперме. Зародыш однодольных имеет только одну семядолю, а питательные вещества находятся, как правило, в эндосперме.

Answer 2

Ответ:

Растения одного класса имеют в семени одну семядолю и называются однодольными, а растения другого — две семядоли, и называются соответственно, двудольными. Кроме наличия семядолей они различаются по особенностям строения цветка. У однодольных цветок имеет простой околоцветник, а у двудольных — двойной, состоящий из чашечки и венчика

Answer 3

Difference between Seed Germination in Dicotyledonous and Monocotyledonous Plants

Seed germination is the process by which a seed develops into a new plant. While there are similarities in the germination process between dicotyledonous (dicots) and monocotyledonous (monocots) plants, there are also some key differences. Let's explore these differences in more detail:

1. Seed Structure: - Dicotyledonous plants have seeds with two cotyledons (embryonic leaves) inside. These cotyledons store nutrients that provide nourishment to the developing seedling during germination. - Monocotyledonous plants have seeds with a single cotyledon. The cotyledon in monocots is usually thin and does not store significant amounts of nutrients.

2. Germination Process: - In dicots, during germination, the radicle (embryonic root) emerges first from the seed, followed by the hypocotyl (embryonic stem) and the cotyledons. The cotyledons eventually emerge above the ground and become the first leaves of the seedling. - In monocots, the radicle also emerges first, but the cotyledon remains underground and does not emerge above the soil surface. Instead, a structure called the coleoptile protects the emerging shoot (plumule) as it grows upward.

3. Nutrient Utilization: - Dicotyledonous plants rely on the stored nutrients in the cotyledons for initial growth and development until they can produce their own food through photosynthesis. - Monocotyledonous plants, on the other hand, do not rely heavily on stored nutrients in the cotyledon. They have an endosperm, a tissue rich in starch, which provides nourishment to the developing seedling until it can photosynthesize.

4. Leaf Development: - Dicotyledonous plants typically have broad, flat leaves with a network of veins. The leaves of dicots usually have a distinct pattern of branching veins. - Monocotyledonous plants have long, narrow leaves with parallel veins. The leaves of monocots lack the distinct branching pattern seen in dicots.

5. Examples: - Examples of dicotyledonous plants include roses, sunflowers, and oak trees. - Examples of monocotyledonous plants include grasses, lilies, and orchids.

It's important to note that while these differences exist, there are also many similarities in the germination process between dicots and monocots. Both types of plants require water, oxygen, and suitable temperature conditions for germination to occur. Additionally, both dicots and monocots undergo similar stages of germination, including seed imbibition, radicle emergence, and shoot development.