Grey crescent is the area

• at the point of entry of sperm into ovum

• just opposite to the site of entry of sperm into ovum

• at the animal poles

• at the vegetal pole

A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughters and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance do you suggest for this disease?

• Autosomal dominant

• Sex-linked dominant

• Sex-limited recessive

• Sex-linked recessive

In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues?

• Stem and root

• All parts

• Shoot tips and root tips

• Flowers, fruits and leaves

In Ornithine cycle, which of the following wastes are removed from the blood?

• Urea and urine

• Ammonia and urea

• CO₂ and ammonia

• CO₂ and urea

Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from non-living matter?

• Microbes did not appear in stored meat

• Larvae could appear in decaying organic matter

• Microbes appeared from unsterilized organic matter

• Meat was not spoiled, when heated and kept sealed in a vessel

Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example

• enlargement of body size by swallowing air in puffer fish

• melanism in moths

• poison fangs in snakes

• colour change in chameleon

Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution?

• Development of transgenic animals

• Production of 'Dolly' the sheep by cloning

• Prevalence of pesticide resistant insects

• Development of organs from 'stem cells' for
  organ transplantation

According to IUCN red list what is the status of red Panda (Athurus fulgens)?

• Vulnerable species

• Critically endangered species

• Extinct species

• Endangered species

There are two opposing views about origin of modern man. According to one view Homo erectus in Asia were the ancestors of modern man. A study of variations of DNA however suggested African origin of modern man. What kind of observation on DNA variation could suggest this?

• Greater variation in Africa than in Asia

• Variation only in Asia and no variation in Africa

• Greater variation in Asia than in Africa

• Similar variation in Africa and Asia

The world's highly prized wool yielding 'Pashmina' breed is

• sheep

• goat

• goat- sheep cross

• Kashmir sheep- Afghan sheep cross