(D) Wnte two micro-organisms which are found in soll. 7. (a) Arrange the sentences in terms of P, Q, R, S) given below in order to describe the process of fertilization P: The zygote divides inside the ovule to form the embryo. Q: The pollen grains germinate when they fall on the stigma of a flower of the same species R: The male and female gametes fuse to form a zygote. S: A pollen tube is produced that reaches the ovule (b) What is the name of the process in which - ) the pollen grains is transferred from anther to stigma of a flower? (1) the male gamete fuses with female gamete?
Answers
Answer:
Soils contain about 8 to 15 tons of bacteria, fungi, protozoa, nematodes, earthworms, and arthropods. See fact sheets on Roles of Soil Bacteria, Fungus, Protozoa, and Nematodes.07-Sep-2010
Soils contain about 8 to 15 tons of bacteria, fungi, protozoa, nematodes, earthworms, and arthropods. See fact sheets on Roles of Soil Bacteria, Fungus, Protozoa, and Nematodes.07-Sep-2010Fungi: 105–106
Soils contain about 8 to 15 tons of bacteria, fungi, protozoa, nematodes, earthworms, and arthropods. See fact sheets on Roles of Soil Bacteria, Fungus, Protozoa, and Nematodes.07-Sep-2010Fungi: 105–106Bacteria: 108–109
Soils contain about 8 to 15 tons of bacteria, fungi, protozoa, nematodes, earthworms, and arthropods. See fact sheets on Roles of Soil Bacteria, Fungus, Protozoa, and Nematodes.07-Sep-2010Fungi: 105–106Bacteria: 108–109Actinomycetes: 107–108
Soils contain about 8 to 15 tons of bacteria, fungi, protozoa, nematodes, earthworms, and arthropods. See fact sheets on Roles of Soil Bacteria, Fungus, Protozoa, and Nematodes.07-Sep-2010Fungi: 105–106Bacteria: 108–109Actinomycetes: 107–108Protozoa: 103–104
Explanation:
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Answer:
1) Pollination- the pollen grains are carried by wind, water or insects and animals to reach the stigma of the flower.
This process of transfer of pollen grains is called pollination.
2) Germination- the pollen tubes begins to grow towards the egg cell.
These tubes are a pathway for the sperms or male gamete to reach the egg within the ovule.
3) Penetration of the Ovule- The pollen tubes reach the ovule where it penetrates the ovule to reach the female gamete or egg.
4) Fertilization- the male gamete travel down the pollen tubes and fertilize an egg.
In angiosperms, double fertilization takes place where both egg and the polar nuclei in the embryo sac are fertilized by the male gametes.
5) Post-fertilization- The flower withers and the ovary begins to grow to form a fruit.
The ovule develops into seeds inside the fruits.
So, the correct answer is 'Q→S→T→P→R'.