Organisms and Populations — BIOLOGY STD 12 Science — Question

Pusa Komal is the variety of _____ that is ariety of resistant to bacterial blight.

The first movements of the foetus and appearance of hair on the head are observed during the _______ month of pregnancy.

Downstream processing involves separation and ______.

________ probably lived in East African grasslands about 2 mya.

Fill in the blanks:
Fertilisation is _____________ in humans. (external/ internal)

______________ gas is continuously produced by the action of UV rays on molecular oxygen.

Development of unfertilised ovum into a new individual, is called ______________.

Fill in the blanks:
The structure which provides vascular connection between fetus and uterus is called _____________.

The following variables contribute to the overall impact humans have on natural ecosystems. Indicate whether they occur in the country or in the city or both.

1. Excessive fuel consumption __________.
2. Heavy use of fertilizers, pesticides, herbicides __________.
3. Excessive human sewage (Pollution) __________.
4. Generous irrigation __________.

The male whorl, called the ……………… produces ………………