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Answers
1) Even though each pollen grain has two male gametes, atleast 10 pollen grains required to fertilise 10 ovules present in a particular carpel instead of 5 pollen grains because only one male gamete is involved in syngamy or the fusion of male gamete with the egg cell.
2) Pollen grains germination is happen in the stigma part of the female flower.
3) Animals that reproduce by budding include corals, some sponges, some acoel flatworms (e.g., Convolutriloba), and echinoderm larvae.
4) The endosperm is a tissue produced inside the seeds of most of the flowering plants following fertilization. It is triploid (meaning three chromosome sets per nucleus) in most species. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein.
5) The two main actions of oxytocin in the body are contraction of the womb (uterus) during childbirth and lactation. Oxytocin stimulates the uterine muscles to contract and also increases production of prostaglandins, which increase the contractions further.
6) In Eutherian mammals the acrosome contains digestive enzymes (including hyaluronidase and acrosin). These enzymes break down the outer membrane of the ovum, called the zona pellucida, allowing the haploid nucleus in the sperm cell to join with the haploid nucleus in the ovum.
7) May 28
8) Contraception allows them to put off having children until their bodies are fully able to support a pregnancy. It can also prevent pregnancy for older women who face pregnancy-related risks. Contraceptive use reduces the need for abortion by preventing unwanted pregnancies.
9) Fertilisation occurs in Fallopian tube and implantation takes place in uterus .
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