Which one of the followings cells are attacked by HIV?

Match List-l with List-II

List-l (Structure)	List-II (Relation)
(A) Thalamus	(I) Seed
(B) Nucellus	(II) Fruit
(C) Ovule	(III) Germination
(D) Micropyle	(IV) Perisperm

Choose the correct answer from the options given below:

Read the following passage carefully and answer the given questions.
Cancerous cells just continue to divide giving rise to masses of cells called tumors. Benign tumors normally remain confined to their original location and do not spread to other parts of the body and cause little damage. The malignant tumors, on the other hand are a mass of proliferating cells called neoplastic or tumor cells. Transformation of normal cells into cancerous neoplastic cells may be induced by physical, chemical or biological agents. Ionising radiations like X-rays and gamma rays and non-ionizing radiations like UV cause cancer. Cancer-causing viruses are called oncogenic viruses which have viral oncogenes. The substances to which an immune response is produced are called allergens. The antibodies produced to these are of IgE type. Common examples of allergens are mites in dust, pollens, animal dander, etc. The primary lymphoid organs are bone marrow and thymus. The secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells.
The primary lymphoid organs are:

Read the following passage carefully and answer the given questions. During anaerobic sludge digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide. These gases form biogas and can be used as source of energy as it is inflammable. The bioactive molecule, cyclosporin A, that is used as an immunosuppressive agent in organ-transplant patients, is produced by the fungus Trichoderma polysporum. You must have noticed that bottled fruit juices bought from the market are clearer as compared to those made at home. This is because the bottled juices are clarified by the use of pectinases and proteases. Statins produced by the yeast Monascus purpureus have been commercialised as blood-cholesterol lowering agents. It acts by competitively inhibiting the enzyme responsible for synthesis of cholesterol. The BOD test measures the rate of uptake of oxygen by microorganisms in a sample of water and thus, indirectly, BOD is a measure of the organic matter present in the water.
Statins, used as blood-cholesterol lowering agents are produced by -

Identify the hormone releasing IUDs -

Recombinant DNA technology involves the following steps in a specific
sequence.
(A) Culture of the host cell
(B) Extraction of desired product
(C) Isolation of desired DNA fragments
(D) Transformation of the recombinant DNA into the host cell
Arrange these sequences correctly and choose the correct answer from
the options given below:

Which of the following statements are true with reference to homology or homologous organs?
(A) Homology indicates common ancestry.
(B) Whale and Cheetah share similarities in the pattern of the bones of the forelimbs.
(C) Vertebrate heart is an example of homologous organs.
(D) Thorn of Bougainvillea and tendrils of cucurbita represent homology.
Choose the correct answer from the options given below:

Arrange the following events of malarial infection in human beings sequentially:
(A) Transmission of gametocyte to female mosquito
(B) Gametocyte development in RBC
(C) Multiplication of parasite in RBC and rupturing of RBC
(D) Biting by female Anopheles mosquito and transmission of sporozoites
(E) Multiplication of parasite in liver cell
Choose the correct answer from the options given below:

Common cold is caused by:

The probability that A hits a target is \(\frac{1}{5}\) and the probability that B hits it is \(\frac{2}{3}\) The probability that the target will be hit if both A and B shoot at it independently is:

Toxin of Bacillus thuringiensis is activated in insect by:

The general solution of the differential equation \(\frac{d y}{d x}+y \tan x=\sec x\)

In the exponential growth model equation dN/dt= rN 'N' stands for: