MCQ
Which is the latest era of geological time scale?
- AAzoic
- BProterozoic
- CCoenozoic
- DMesozoic
Explanation:
The Azoic era is the era without life which includes the origin of the earth, its cooling down and other changes to make it suitable for life forms. The Proterozoic era (2000 million yrs ago and spanned for 1500 million years), the era of early life, is marked by a build-up of oxygenic atmosphere and appearance of the first eukaryotic cell.
Mesozoic era (from 230 million years ago to 63 million yrs ago) is the era of medieval life and includes three periods namely, Cretaceous (135 million years), Jurassic (180 million years) and Triassic (225 million years). It is also known as the age of gymnosperms or age of reptiles.
The Cenozoic era is the era of modern life and is also known as the age of mammals and angiosperms. It began 63 million yrs ago and is still continuing which makes it the most recent/latest.
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$(1)$ The process of fusion of a sperm with an ovum is called fertilisation
$(2)$ $LH$ surge induces rupture of graffian follicle
$(3)$ $8$ cells embryo is called morula
$(4)$ Length of fallopian tube is $8-10 \,cm$
$(1)$ They have dark colour and high rate of reproduction and excrete solid urine.
$(2)$ They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs.
$(3)$ They feed on dry seeds and do not require drinking water.
$(4)$ They excrete very concentrated urine and do not use water to regulate body temperature.
Which two of the above statements for such animals are true ?
$I.$ Group of independent, interacting populations of same species
$II.$ Group of independent and interacting populations of same species in specific area
$III.$ Group of independent interacting populations of different species in a specific area
$IV.$ Group of independent and interacting populations of different species in different area
Select the correct option