During pregnancy increasing quantities of oestrogen and progesterone are secreted by the placenta, stimulating the secretory cells to become active ; Immediately after birth ; the sharp drop in progesterone stimulate pituitary glands to secrete hormone prolactin ; prolactin cause the milk secreting cells to release milk into the alveoli of the
breast ;
sharon kalunda answered the question on May 29, 2019 at 07:58
- Define the term lactation.(Solved)
Define the term lactation.
Date posted: May 29, 2019. Answers (1)
- The diagram below shows a section through the human breast during lactation.
(i) Identify each of the part labelled A and B.
(ii) State functions of...(Solved)
The diagram below shows a section through the human breast during lactation.
(i) Identify each of the part labelled A and B.
(ii) State functions of the part labelled C and D.
Date posted: May 29, 2019. Answers (1)
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Explain the effect of light on the opening of the stomata.
Date posted: May 29, 2019. Answers (1)
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Name the mineral ion that is used to form proteins.
Date posted: May 29, 2019. Answers (1)
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Name the tissue that transports the sugars made by photosynthesis to other parts of the plant.
Date posted: May 29, 2019. Answers (1)
- The figure below shows a section through a leaf. A leaf is designed for photosynthesis and this process provides a supply
of simple sugars for a...(Solved)
The figure below shows a section through a leaf. A leaf is designed for photosynthesis and this process provides a supply
of simple sugars for a plant.
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(i) State the function of the chloroplasts in photosynthesis.
(ii) Explain the advantage of the distribution of the chloroplasts as shown in the figure above.
(iii) Suggest the function of the stomata and the spaces between spongy mesophyll cells in the process of photosynthesis.
Date posted: May 29, 2019. Answers (1)
- In a family with four children three were found to have normal skin pigmentation while one was an albino. Using letter A to represent gene...(Solved)
In a family with four children three were found to have normal skin pigmentation while one was an albino. Using letter A to represent gene for normal skin pigmentation and a to represent the gene for albinism.
(a) What are the possible genotypes of the parents?
(b) Work out the genotypic ratio of their children.
(c) Apart from albinism, name two disorders that are genetically inherited in human beings.
Date posted: May 29, 2019. Answers (1)
- The diagram below shows the exchange of gases in the alveolus. Study it and answer the questions that follow.
(a) Name the gases named F and...(Solved)
The diagram below shows the exchange of gases in the alveolus. Study it and answer the questions that follow.
(a) Name the gases named F and B.
(b) State the importance of the gas marked B in the tissue.
(c) Name the parts marked K and P.
(d) State the adaptations of the alveolus to its function.
Date posted: May 29, 2019. Answers (1)
- Name three meristems in woody plants.(Solved)
Name three meristems in woody plants.
Date posted: May 29, 2019. Answers (1)
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State four functions of bones in mammals.
Date posted: May 29, 2019. Answers (1)
- The diagram below shows a bean seeding pinned in a klinostat. Study the diagram and then answer the questions that follow.
Account for the observation made...(Solved)
The diagram below shows a bean seeding pinned in a klinostat. Study the diagram and then answer the questions that follow.
Account for the observation made after 48 hours with the klinostat moving.
Date posted: May 29, 2019. Answers (1)
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Explain why the number of predators in any ecosystem is always less than the number of preys.
Date posted: May 29, 2019. Answers (1)
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What is the meaning of a phrase “biological control of a population”?
Date posted: May 29, 2019. Answers (1)
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Distinguish between intraspecific and interspecific competition.
Date posted: May 29, 2019. Answers (1)
- A student collected a bone from the school garden. The bone was measuring 45 cm. He drew the bone in his book and his diagram...(Solved)
A student collected a bone from the school garden. The bone was measuring 45 cm. He drew the bone in his book and his diagram was 9 cm long.Calculate the magnification of his drawing.
Date posted: May 29, 2019. Answers (1)
- Study the diagram of the nephron below and then answer the questions that follow.
(a) Name the structures labelled S and R.
(b) When some...(Solved)
Study the diagram of the nephron below and then answer the questions that follow.
(a) Name the structures labelled S and R.
(b) When some pressure is applied at W, a fluid appears at V. Name the fluid formed at V.
(c) State the structural difference between structure labelled Q and the one labelled U.
Date posted: May 29, 2019. Answers (1)
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Explain the role of vasodilation in thermoregulation.
Date posted: May 29, 2019. Answers (1)
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List four differences between aerobic respiration and photosynthesis.
Date posted: May 29, 2019. Answers (1)
- In a body of fish, water flows along the gill filament in a direction opposite that of the blood.Explain the importance of this.(Solved)
In a body of fish, water flows along the gill filament in a direction opposite that of the blood.Explain the importance of this.
Date posted: May 29, 2019. Answers (1)
- A student set up an experiment as shown below. Study the set-up and then answer the questions that follow.
Before setting the experiment, the potted plant...(Solved)
A student set up an experiment as shown below. Study the set-up and then answer the questions that follow.
Before setting the experiment, the potted plant was kept in darkness over night.
(a) Explain the importance of keeping the plant over night before the experiment.
(b) What was the role of sodium hydroxide in the experiment?
(c) What were the expected results at the end of the experiment?
Date posted: May 29, 2019. Answers (1)