STD 11 - 4. Animal kingdom — NEET STD 11 Science — Question

Which hormone of the female body is suppressed by the oral contraceptive pills?

What are the three basic components of connective tissues?

The blood of cockroach contains no respiratory pigment. It means that

Purkinje's fibres of the vertebrate heart are modified

Select the correct match

Class	Phylum/Division
A. Mammalia	i. Arthropoda
B. Insecta	ii. Angiospermae
C. Dicotyledonae	iii. Angiospermae
D. Monocotyledonae	iv. Gymnosperm

Sedatives, tranquillisers, stimulants and hallucinogens are the psychosis drugs which affect the

Which option is correct for given statements ?
(i) Smoking is associated with increased incidence of cancers of lung, urinary bladder and throat, bronchitis, emphysema, coronary heart disease, gastric ulcer, etc.
(ii) Tobacco chewing is associated with increased risk of cancer of the oral cavity.
(iii) The chronic use of drugs and alcohol damages nervous system and liver (cirrhosis).
(iv) Period between 12-18 years of age may be thought of as adolescence period.
(v) Excessive doses of drugs may lead to coma and death due to respiratory failure, heart failure or cerebral haemorrhage.
(vi) A combination of drugs or their intake along with alcohol generally results in overdosing and even deaths.
(vii) In the adolescent male or female, severe facial and body acne, and premature closure of the growth centres of the long bones may result in stunted growth due to abuse of anabolic steroids.

The functional unit of mutation is

The seminiferous tubules of the testis are lined by the germinal epithelium consisting of