81.

Which one of the following proved effective for biological control of nematodal diseases in plants?

• Pisolithus tinctorius

• Pseudomonas cepacin

• Gliocladium virens

• Gliocladium virens

Which one of the following condition in humans is correctly matched with tis chromosomal abnormality /linkage?

• Klinefelter's syndrom-44 autosomes + XXX

• Colourblindness- Y-linked

• Erythroblastosis foetails - X-linked

• Erythroblastosis foetails - X-linked

What does the filiform apparatus do at the entrance into ovule?

• It helps in the entry of pollen tube into a synergid

• It prevents entry of more than one pollen tube into the embryo sac

• It brings about opening of the pollen tube

• It brings about opening of the pollen tube

Which one of the following is being tried in India as a biofuel substitute for fossil fuels

• Jatropha

• Azadirachta

• Musa

• Musa

What is antissense technology? 

• A cell displaying a foreign antigen used for synthesis of antigens

• Production of somaclonal variants in tissue cultures. 

• When a piece of RNA that is complementary to sequence is used to stop expression of a specific gene.

• When a piece of RNA that is complementary to sequence is used to stop expression of a specific gene.

Haploids are more suitable for mutation studies than the diploids. This is because 

• Haploids are reproductively more stable than diploids

• mutagens penetrate in haploids more effectively than is diploids

• haploids are more abundant in nature than diploids

• haploids are more abundant in nature than diploids

Importance of day length in flowering of plants was first shown in 

• Lemna

• tobacco

• Cotton 

• Cotton 

The linking of antibiotic resistance gene with the plasmid vector became possible with

• DNA ligase

• endonucleases

• DNA polymerase

• DNA polymerase

Which one of the following statement is incorrect about menstruation? 

• During normal menstruation, about 40 mL blood is lost

• The menstrual fluid can easily clot

• At menopause in a female, there is especially abrupt increase in gonadotropic hormones

• At menopause in a female, there is especially abrupt increase in gonadotropic hormones

Consider the following statements concerning food chains

A) removal of 80% tigers from an area resulted in greatly increased growth of vegetation

B) removal of most of the carnivores resulted in an increased population of deers

C) length of food chains is generally limited to 3-4 trophic levels due to energy loss

D) the length of food chains may vary from 2 to 8 trophic level

Which two of the above statements are correct? 

• B and C

• C and D

• A and D

• A and D