Home
Class 11
BIOLOGY
Read the following statements and select...

Read the following statements and select the option which identifies the incorrect ones.
(i) Potato spindle tuber disease and Chrysanthermum stunt disease are caused by viroids.
(ii) `T_(4)` bacteriophage exhibits lytic cycle.
(iii) Retroviruses have two copies of ssRNA.
(iv) Interferous which prevent viral multiplication are glycolipid particles.

A

ii and iii

B

i and iv

C

iii only

D

iv only

Text Solution

Verified by Experts

The correct Answer is:
D
Interferons are proteins that increase the resistance of cells to attrack by virus.Interferons are produced commercially for therapeutic purposes using genetically engineered bacteria or human tissue culture.
Promotional Banner

Similar Questions

Explore conceptually related problems

Read the following statements and select the option having both incorrect statements (i) Condoms decrease sperm motility (ii) Diaphragms, cervical caps and vaults are for both males and females (iii) IUDs are inserted by expert nurses (iv) Sterilisation is a terminal method to prevent further pregnancy.

Read the following statements and select the correct ones. (i) Conidia are the asexual propagules restricted to Kingdom Fungi. (ii) Apiece of potato tuber having at least one eye (or node) is capable of giving rise to a new plant. (iii) Ginger propagates vegetatively with the help of its underground roots. (iv) Fleshy buds which take part in vegetative propagation are called bulbilsm present in Dioscorea, Agave, etc.

Consider the following statements and select the option stating which ones are true (T) and which ones are false (F) (i) There are many side effects of tubectomy and vasectomy (ii) Purpose of tubectomy is to prevent egg formation (iii) Contraceptive oral pills help in birth control by preventing ovulation (iv) Gential warts is a sexually transmitted disease caused by herpes virus (v) In India, there is rapid decline in infant mortality rate adn MMR.

Consider the following four statements and select the correct option stating which ones are true (T) and which ones are false (F). (i) The stomach has the lowest pH. (ii) The liver contains lipid emulsifier (iii) Large intestine secretes many enzymes. (iv) All proteases function in the lumen of small intestine.

Consider the following statements and select the option stating which ones are true (T) and which ones are false (F) (i) Abortions could happen spontaneously too (ii) Infertility is the ibability to produce viable offspring due to defects in the female partner only. (iii) Complete lactation could help in contraception (iv) Creating awareness can help create a reproductively healthy society.

Consider the following statement and select the option stating which ones are true (T) and which ones are false (F) (i) Emigration is the movement of individuals out of a place or country (ii) Combined contraceptive pills contain synthetic progesterone and estrogen to check ovulation (iii) Depo-Provera are estrogen derivative injections (iv) The scientific study of human population is called demography.

Read the following statements and select the correct ones. (i) Vaccine is a preparation (or suspension ) of a dead/attenuated pathogen of a disease which on inoculation ( or injection ) into a healthy person, provides temporary/permanent active immunity by inducing antibodies formation. (ii) Immunisation is the process by which the body produces antibodies against the vaccine preventable diseases through administration of specific vaccines. (iii) The principle of immunisation or vaccination is based on the property of 'memory' of the immune system. iv) If a person is infected with some deadly microbes to which quick immune response is required; in that case, we need to directly inject the performed antibodies or antitoxins e.g., in case of tetanus.

Read the following statements carefully. (i) Cancer causing viruses have genes called viral oncogenes. (ii) Malignant tumors remain confined to their original location. (iii) Cancer cells do not exhibit contact inhibition. (iv) X-rays and UV rays are not potent carcinogens. (v) Cancer detection is based on biopsy. Which of the above statements are not correct regarding cancer ?

Read the following statements regarding particulate matter and select the incoorect ones. (i) Particulate matter (PM) consists of shoot, flyash, dust, spores, pollen grains, etc. (ii) Particulate matter is differentiated into settleable (larger than 10 mu m , remaining in air for less than one day) and suspended (less than 10 mu m remaining in air for more than one day to several weeks ) particulate matter. (iii) SPM (Suspended particulate matter ) consists of aerosol, dust and mist. (iv) Particulate matter causes respiratory diseases such as tuberculosis, allergy and many more diseases in animals and plants. (v) According to Central Pollution Control Board (CPCB), particulate size of 2.5 mu m or less in diameter are responsible for causing the greatest harm to human health.

Consider the following four statements (i) - (iv) and select the correct option stating which ones are true (T) and which ones are false (F) (i) The epithelium of proximal convoluted tobule (PCT) of nephron in the kidney has microvilli (ii) Simple epithelium covers the dry surface of the skin, the moist surface of buccal cavity, pharynx, inner lining of salivary glands and of pancreatic ducts (iii) The wall of internal organs such as the blood vessels, stomach and intestine contains skeletal muscle (iv) Bone marrow in some bones is the site of production of blood cells.