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Biology: Placenta, Pollination, and Progesterone

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Biology: Placenta, Pollination, and Progesterone

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Questions and Answers

What is the function of ribosomes during protein synthesis?

Site of translation

How does RNA differ from DNA in terms of the bases they contain?

Thymine (T) is replaced with uracil (U)

What is the genetic composition of sex chromosomes in human females?

What is the role of tRNA during translation?

Carries specific amino acids to ribosomes Signup and view all the answers

Define sexual reproduction in terms of gametes fusion.

Involves fusion of male and female gametes Signup and view all the answers

What is the function of the placenta during pregnancy?

Facilitates exchange of nutrients and waste between mother and fetus Signup and view all the answers

What is the function of amniotic fluid in pregnancy?

Protects and surrounds the embryo in the uterus Signup and view all the answers

Describe the process of fertilisation.

Fusion of the nucleus of male and female gametes to restore the full chromosome number Signup and view all the answers

What is the role of Follicle-Stimulating Hormone (FSH) in the female reproductive system?

Stimulates the growth of follicles in the ovary and the secretion of oestrogen Signup and view all the answers

Explain the function of Luteinising Hormone (LH) in the menstrual cycle.

Initiates ovulation, the release of an egg from the ovary Signup and view all the answers

What are the main functions of Oestrogen in the female reproductive system?

Causes growth and repair of the uterus lining, development of secondary sexual characteristics Signup and view all the answers

Explain the role of the placenta during pregnancy.

Provides nutrients and oxygen to the fetus, removes waste products, produces hormones Signup and view all the answers

What is the function of the placenta during pregnancy?

Provides nutrients to the developing embryo Signup and view all the answers

Define pollination and explain how it enables fertilisation in plants.

Transfer of pollen grains from the male part of a plant to the female part; enables fertilisation by delivering male gametes to the female reproductive structure. Signup and view all the answers

What hormone maintains the uterus lining and is produced in the ovaries and placenta?

Progesterone Signup and view all the answers

Explain the role of testosterone in males and its effects on male secondary sexual characteristics.

Main male reproductive hormone; stimulates sperm production and development of male secondary sexual characteristics. Signup and view all the answers

What is sexual reproduction and how does it contribute to genetic variation?

Involves fusion of male and female gametes; leads to genetic variation through the combination of genetic material from both parents. Signup and view all the answers