Answer:It is locked up in glaciers and ice caps.
Explanation:
Double fertilization is observed in flowering plants during which there is fusion of the sperm cells and the egg cell and two polar nuclei. This forms a diploid zygote and a triploid endosperm.
ANSWER: All of these choices are correct.
Answer:
The correct answer will be option-B.
Explanation:
The plant tissues are composed of three types of cells: parenchyma, collenchyma and sclerenchyma.
The parenchyma and collenchyma remain alive at their maturity but sclerenchyma loses their protoplasm and become dead. These cells deposit lignin in their secondary walls and form hard tissues of the plant-like hard shell of a coconut. Sclerenchyma provides mechanical strength to the plant.
Thus, Option-B is the correct answer.
