Which of the following statement are not true about shark?
a. The skin is tough and covered with placoid scales.
b. They possess a swim bladder which regulates buoyancy.
c. the tail of shark is heterocercal.
d. Ampulla of lorenzini present in the snout of shark is thermoreceptor.
e. it has five pairs of gill slits covered by operculum.

Which of the following statements are true about amphibians? a. they are cold-blooded b. Respiration occurs through gills, skin and lungs. c. they are poikilotherms d. Respiration occurs only through gills and skin.

Which of the following statements are true about amphibians? a. they are cold-blooded b. Respiration occurs through gills, skin and lungs. c. they are poikilotherms d. Respiration occurs only through gills and skin.

Consider the following characteristic of fishes :- (1) They have four pairs of gills which are covered by an operculum. (2) They have air bladder which regulates buoyancy (3) They are mostly viviparous and development is direct (4) Their body is streamlined and covered with cycloid/ctenoid scales Which of the above characteristics regarding bony fishes are correct?

Read the following statements and find out the incorrect statements. a. Mons pubis is a cushion of fatty tissue covered by skin and pubic hair. b. The labia minora are fleshy folds of tissue, which extend doen from the mons pubis and surround the vaginal opening. c. The opening of the vagina is often covered partially by a membrane called hymen. d. The clitoris lies at the upper junction of two labia majora above the urethral opening . e. The presence or absence of hymen is a reliable indicator of virginity or sexual experience.

Read the following statements and find out the incorrect statements. a. Mons pubis is a cushion of fatty tissue covered by skin and pubic hair. b. The labia minora are fleshy folds of tissue, which extend down from the mons pubis and surround the vaginal opening. c. The opening of the vagina is often covered partially by a membrane called hymen. d. The clitoris lies at the upper junction of two labia majora above the urethral opening. e. The presence or absence of hymen is a reliable indicator of virginity or sexual experience.

Which of the following statements is (are) true about resonance. (a) Resonance is an intramolecular process. (b) Resonance involves delocalization of both sigma " and " pi electrons. (c )Resonance involves delocalization of pi electrons and lone pair only. (d) Resonance decreases potential energy of a molecule. (e ) Resonance has no effect on the potential energy of a molecule. (f)Resonance is the only way to increase molecular stability. (g) Resonance is not the only way to increase molecular stability. (h) Any resonating molecule is always more stable than any nonresonating molecule. (i) The canonical structure explains all features of a molecule. (j) The resonance hybrid explains all features of a molecule. (k)Resonating structures are real and resonance hybrid is imaginary. (l) Resonance hybrid is real and resonating structures are imaginary. (m) Resonance hybrid is always more stable than all canonical structures.

Which of following statement is true for lac operon in E-coli (a) lac operon consists of one regulatory gene and five structural gene. (b) The i gene codes for inducer (c) The z-gene codes for beta -galacosidase (d) A very low level of expression of lac operon has to be present in cell all the time

Read the following statements and find out the incorrect statements. a. Mons pubis is a cushion of fatty tissue covered by skin and pubic hair. b. The labia minora are fleshy folds of tissue, which extend from the mons pubis and surround the vaginal opening. c. The opening of the vagina is often covered partially by a membrane called hymen. d. The clitoris lies at the upper junction of two labia majora above the urethral opening . e. The presence or absence of hymen is a reliable indicator of virginity or sexual experience.