Advertisements
Advertisements
प्रश्न
The role of ethylene and abscisic acid is both positive and negative. Justify the statement.
उत्तर
Positive roles of ethylene: Influences of ethylene on plants include horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings. Ethylene breaks seed and bud dormancy, initiates germination in peanut seeds and sprouting of potato tubers.
- Negative roles of ethylene: Ethylene promotes senescence and abscission of plant organs especially leaves and flowers.
- Positive roles of abscisic acid: ABA plays an important role in seed development and maturation.
- Negative roles of abscisic acid: It acts as a general plant growth inhibitor and an inhibitor of plant metabolism. ABA inhibits seed germination. ABA stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stresses.
APPEARS IN
संबंधित प्रश्न
Define parthenocarpy.
How many meiotic divisions are required to produce 200 seeds?
Seeds sown very deep in the soil fail to germinate because they
Name the following :
The layer of the endosperm of maize rich in protein.
Suggest an experiment to prove that a suitable temperature is necessary for germination.
Sometimes the potatoes kept in a basket during the late rainy season start giving out small shoots. Would you call it germination? Give reasons in support of your answer.
Give Two Differences in the Following Pairs:
Coleorhiza and coleoptile
For the formation of 50 seeds, how many minimum meiotic divisions are necessary?
Define germination? Name the two types of germination. Explain with examples.
Three conditions necessary for seed germination are _____, _____, and ______.
Name the two types of seed germination.
Explain the following term:
Dormancy
Explain the following term:
Hypogeal germination
Pollination and seeds formation is very crucial for fruit formation. Justify the statement.
Label the parts of seed.
From which of the following a true fruit is developed?
