Late blight of potato is caused by
Ustilago
Pseudomonas
Phytophthora infestans
Colletotrichum falcatum
Most accepted theory for ascent of sap is
capillarity theory
root pressure theory
pulsation theory
transpiration pull theory
D.
transpiration pull theory
Transpiration pull is the tension, which develops due to transpiration. It has been demonstrated and evidenced, that rate of water absorption and hence, ascent of sap closely follows the rate of transpiration.
Cohesion and Transpiration pull theory, given by Dixon and Jolly (1894) is the most accepted theory tor ascent of sap.
Male Anopheles does not transmit malarial parasite because
it catches fever
it is too small to carry parasite
the parasite is killed in its stomach
it does not drink blood
The trisomy for 21st chromosome is called
Down's syndrome
Turner's syndrome
Sickle cell anaemia
Klinefelter's syndrome