hort Answer Questions.
. Define the process of reproduction,
. What is the difference between monocot an
. Why is seed dispersal necessary?
What does the term 'agents of dispersal' m
Differentiate between rabi and kharif crops
What is step farming?
Differentiate between invertebrates and ver
ag Answer Questions.
Answers
Answer:
Seed coat: It is the outer covering the of seed. It protects the internal parts.
Seed leaves or cotyledons: Cotyledons are present inside the seed. Cotyledons absorb the food from the parent plant and store it for the embryo. They also protect the embryo. Some seeds have two seed leaves like gram, pea, bean, etc. Such seeds are called dicot or dicotyledonous. Some seeds have only one seed leaf. They are called monocot or monocotyledonous.
Embryo or baby plant: It is present inside the seeds which develop into a new plant. The embryo gives rise to a baby shoot (plumule) and root (radical).
SeedStructure of a seed (Source: Shutterstock)
Activity I
Take four shallow dishes. Place cotton in each dish. Take a few gram seeds and put some of them on each dish. Now, follow the steps gives below for each dish.
Dish 1: Keep this dish in a place where it gets an adequate amount of air and warmth. The cotton should be moist.
Dish 2: Place the second dish in the refrigerator and keep the cotton moist.
Dish 3: Place it where it can get an adequate amount of air and warmth. Do not wet the cotton.
Dish4: Place it where it can get adequate sunlight. Keep the seed and the cotton covered with water.
Seed
Result: We will see in this activity the seed germinate only in jar B because jar B had water, air, and warmth required for the seed to germinate. Jar A did not have warmth or sunlight. Jar C there was no air for seed. In jar A, the seed did not get water. This shows that if any condition is missing, the seed will not grow into new plants. So air, water, and sunlight are the conditions necessary for germination.
ANSWER:
• It is the biological process by which new individual organisms are produced from their parents.
• The main difference between them is that monocot contains a single cotyledon in its embryo whereas dicot contains 2 cotyledons in its embryo.
• It is important for the survival of the plant species. It allows plants to spread out from a wide area and avoid competing with one another for the same resources.
• Scattering of seeds to far away places by some medium are known as agents of dispersal.
• The major difference is that Rabi crops are grown in the winter season whereas Kharif crops are grown in the monsoon season.
• Farming that consists of different steps or terraces are called step farming.
• Invertebrates are those that do not possess a vertebral column aur backbone while Vertebrates are those where vertebral column or backbone is present.