Sickle cell anaemia is

• an autosomal-linked dominant trait

• caused by substitution of valine by glutamic acid in the β-globin chain of haemoglobin

• caused by a change in a base pair of DNA

• caused by a change in a base pair of DNA

Tiger is not a resident, in which one of the following national park?

• Ranthambhor

• Sunderbans

• Gir

• Gir

In the case of peppered moth (Biston betularia), the black-coloured form became dominant over the light-coloured form in England during the industrial revolution. This is an example of

• natural selection whereby the darker forms were selected

• the appearance of the darker coloured individuals due to very poor sunlight

• protective mimicry

• protective mimicry

Which one of the following correctly describes the location of some body parts in the earthworm Pheretima?

• Two pairs of  accessory glands in 16-18 segments

• Four pairs of spermathecae in 4-7 segments

• One pair of ovaries attached at intersegmental septum of 14th and 15th segments

• One pair of ovaries attached at intersegmental septum of 14th and 15th segments

A health disorder that results from the deficiency of thyroxin in adults and characterised by
(i) a low metabolic rate
(ii) increase in body weight
(iii) tendency to retain water in tissue is 

• hypthyroidism

• simple goitre

• myxoedema

• myxoedema

When breast feeding is replaced by nutritive food in proteins and calories; the infants below the age of one year are likely to suffer from

• marasmus

• rickets

• kwashiorkor

• kwashiorkor

There is no DNA in 

• an enucleated ovum

• mature RBCs

• a mature spermatozoan

• a mature spermatozoan

Foetal ejection reflex in human female is induced by 

• the pressure exerted by the amniotic fluid

• the release of oxytocin from pituitary

• fully developed foetus and placenta

• fully developed foetus and placenta

Which of the following plant species would you select for the production of bioethanol?

• Brassica

• Zea mays

• Pongamia

• Pongamia

Chipko movement was launched for the protection of 

• grasslands

• forests

• livestock

• livestock