STD 12 - 7. human health and disease — NEET STD 11 Science — Question

In a sickle cell anaemia glutamic acid is replaced by valine, which the following codes for glutamic acid ?

Select the correct option:

First generation after a cross is

Ascaris lumbricoides is commonly called

In a zygote if the number of alleles is two in alternate forms, the expression of adult would be

Which of the following are phagocytic in nature?

Which one of the following statements are correct ?
(i) Entamoeba histolytica is a protozoan parasite in large intestine of human which causes amoebiasis (amoebic dysentery) and fruitflies act as mechanical carriers for spread of this disease.
(ii) Wuchereria bancrofti and W.malayi causes elephantiasis or filariasis.
(iii) Many fungi belong to genera Microsporum, Trichophyton and Epidermophyton are responsible for ringworms. heat and moisture conditions help these fungi to grow in groin or between toes.
(iv) Fishes like Gambusia feed on the mosquito larvae in ponds.
(v) The overall ability of host to fight the disease is called immunity.
(vi) In cellular barriers of acquired immunity, certain types of WBC of our body like polymorpho-nuclear leukocyte and monocytes and natural killer in body as well as macrophages in tissue can phagocytose and destroy microbe.
(vii) The response produce by body when it encounter pathogen for the first time is called secondary response.
(viii) The secondary response due to encounter with same pathogen is called anamnestic.
(ix) Two types of lymphocyte present in our body are B-and T-lymphocyte.
(x) T-lymphocyte produces army of protein in response to pathogen called antibodies.
(xi) Each antibody molecule has 2 peptide chains.
(xii) Antibody molecule has 2 light chains and 2 heavy chains and hence antibody is represented as H.L.
(xiii) The immune response mediated by B-lymphocyte is called humoral immune response and by T-lymphocyte is called cell- mediated response.
Choose the correct option given below :-

Excertory organs of Earthworm are

The toxicants which kill the pests on coming in direct contact are known as

Gestation period is the duration