STD 12 - 2. human reproduction — NEET STD 11 Science — Question

The membranes enclosing the brain and spinal cord are known as

Mark the given statements True (T) or False (F).
(i) Squamous epithelium is found in wall of blood vessels and air sacs of lungs.
(ii) Cuboidal epithelium is found in ducts of glands and Henle's loop of nephrons.
(iii) Columnar epithelium lines the inner surface of stomach and intestine.
(iv) The columnar or cuboidal cells bearing cilia on their surface are called ciliated epithelium and are present in inner surface of solid organs like bronchioles and fallopian tubes.
(V) The goblet cells of alimentary canal has unicellular type of glandular epithelium whereas salivary gland has multicellular type.
(vi) Compound epithelium covers the dry surface of the skin, moist surface of buccal cavity, pharynx, innerlining of duct of salivary gland and of pancreatic duct.
(vii) Tight junctions help to stop substances from leaking across a tissue whereas gap junction facilitate cells to communicate with each other by connecting the cytoplasms of adjoining cells.
(viii) Adhering junctions performs cementing to keep neighbouring cells together.
(ix) In all connective tissue the cells secrete fibres of structural proteins called collagen or elastin.
(x) Tendon attach skeletal muscles to bones and ligament attach one bone to another and both are example of loose regular type of connective tissue,
(xi) The cells of cartilage called chondrocytes are enclosed in large cavities within matrix secreted by them.
(xii) The cells of bone called osteocytes are present in the spaces called lacunae.
(xiii) The bone-marrow in all bone is the site of production of blood cells.
(xiv) The fibres of muscle tissue are composed of numerous fine fibrils, called myofibrils,
(xv) The smooth muscle fibres taper at both ends (fusiform) and show striation.
Choose the correct option given below :-

Transgenic animals can be used to:

Assertion : Organ transplantation patients are given immunosuppressive drugs.

Reason : Transplanted tissue has antigens which stimulate the specific immune response of the recipient.

Given below are two statements:
Statement I: RNA mutates at a lower rate.
Statement II: Viruses having DNA genome and shorter life span mutate and evolve faster. Choose the correct answer from the options given below:

Parathormone is secreted during

The biceps and tricep muscles are found in

Fill in the blanks.
(i) Cancer causing agents are called A and cancer causing viruses are called B which have genes called C.
(ii) D or E genes present in normal cells when activated under certain conditions lead to oncogenic transformation of cells.
(iii) In treatment of cancer, patients are given substances called biological response modifier such as F which activates their immune system & helps in destroying tumor.
(iv) Heroin commonly called G is chemically H which is obtained from morphine by I reaction and is extracted from latex of poppy plant J (Scientific name).
(v) Cannabinoids are obtained from the infloroscence of the plant K. They are known for their effects on L system of body.
(vi) Cocaine is obtanied from coca plant M native to N. It interferes with transport of neuro- transmitter O.
(vii) Morphine is very effective P and Q and is very useful in patients who have undergone surgery.
(viii) R is a chemical substance in tobacco that stimulates adrenal gland to release adrenaline and nor-adrenaline into blood.
(ix) Adolescence means both S and T during which a child becomes mature. The period between U and V years of age is adolescence period.
(x) Dependence is the tendency of the body to manifest a characteristic and unpleasant W syndrome.
(xi) Excessive doses of drugs may lead to coma and death due to respiratory failure, heart failure or X.
(xii) The chronic use of drugs and alcohol damages nervous system and Y.
(xiii) The damage to liver due to excessive use of drugs and alcohol is called Z.
choose the correct option given below :-