Long Answer Type(a) Draw a diagrammatic sectional view of the female reproductive system of human and label the parts:
(i) where the secondary oocytes develop
(ii) which helps in collection of ovum after ovulation
(iii) where fertilization occurs
(iv) where implantation of embryo occurs.
(b) Explain the role of pituitary and the ovarian hormones in menstrual cycle in human females.Describe the asexual and sexual phases of life cycle of Plasmodium that causes malaria in humans.
Asexual and sexual phases of life cycle of Plasmodium that causes malaria in humans.
Plasmodium requires two hosts to complete its life cycle.
ii. When female Anopheles mosquito bites a healthy human being, it releases Plasmodium, which lives in its body as sporozoite (infectious form).
iii. The parasites multiply (asexual reproduction) in the liver cells and finally burst the liver cells. Sporozoites are released in blood.
iv. Parasites enter RBCs and further multiply (asexual reproduction) here and finally burst RBCs also.
v. Bursting of RBCs is accompanied by release of a toxic substance called haemozoin (associated with fever and chills).
vi. In the RBCs, only sporozoites change into gametocytes (sexual stage). Gametocytes multiply.
vii When the diseased person is bitten by a female Anopheles mosquito, gametocytes are introduced into the mosquito.
vii Gametocytes fertilise and develop inside the intestine of mosquito to form sporozoites.
ix. Sporozoites are stored in the salivary glands of mosquito and are released into the healthy person who is bitten by this mosquito.
(a) What is plant breeding? List the two steps the classical plant breeding involves.
(b) How has the mutation breeding helps in improving crop varieties? Give one example where this technique has helped.
(c) How has the breeding programme helped in improving the public nutritional health? State two examples in support of your answer.A child by the family from Thalassemia is born to a normal couple. But the mother is being blamed by the family for delivering a sick baby. (a) What is Thalassemia?
(b) How would you counsel the family not to blame the mother for delivering a child suffering from this disease? Explain.
(c) List the values your counseling can propagate in the families.
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