Model Paper 10 — NEET STD 11 Science — Question

All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemakar?

Active immunity may be acquired by

Tubectomy is a method of sterilization in which

Which of the following is a wrong matching of a microbe and its industrial product?

Haemoglobin forms compound with

Which of the following is a member of phylum porifera

Heart beat can be initiated by

Select the incorrect pair :

Some pure black mice were mistakenly mixed with hybrid black mice. The quickest way to discover whether one individual black mouse is pure is

Which of the following statements are incorrect for Natural selection ?
(i) Natural selection is based on certain observations which are factual.
(ii) Populations are stable in size except for seasonal fluctuation, means that there had been competition for resources.
(iii) Variation is the most fundamental evolutionary factor and all variations are inherited to the progeny.
(iv) Variations which are heritable and which make resource utilisation better for few (adapted to habitat better) will enable only those to reproduce and leave more progeny.
(v) Herbicides, pesticides etc., resistant organisms/cells are appearing in a time scale of months or years and not centuries.
(vi) Appearance of herbicides, pesticides etc., resistant organisms/cells are examples of evolution by anthropogenic action.