Populations are said to be sympatric when

1. Populations are said to be sympatric when _______.

(A) two populations are physically isolated by natural barriers.
(B) two populations live together and freely interbreed to produce sterile offspring.
(C) two populations share the same environment but cannot interbreed.
(D) two populations are isolated but occassionally come together to interbreed. Answer: (C)

2. Populations are said to be allopatric when ________.

(A) they are physically isolated by natural barriers
(B) they live together and breed freely to produce viable offspring
(C) they are isolated but often come together for breeding
(D) none of the above            Answer: (A)

3. Polyploid derived from two different species is called

(A) Autopolyploid
(B) Triploid
(C) Allopolyploid
(D) Monoploid              Answer: (C)

4. Pollen grains of a plant whose 2n = 28 are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?

(A) 21
(B) I4
(C) 56
(D) 28        Answer: (B)

5.  Pinus belongs to the class ________.

(A) Gentopsida
(B) Cycadopsida
(C) Coniferopsida
(D) Sphenopsida            Answer: (C)

6.  Pieces of plant tissue used in tissue culture is called

(A) Explant
(B) Somaclone
(C) Inoculant
(D) Clone           Answer: (A)

7. Palaeontologists unearthed a human skull during excavation. A small fragment of the scalp tissue was still attached to it. Only little DNA could be extracted from it. lf the genes of the ancient man need to be analysed, the best way of getting sufficient amount of DNA from this extract is

(A) Subjecting the DNA to polymerase chain reaction
(B) Subjecting the DNA to gel electrophoresis
(C) Treating the DNA with restriction endonucleases
(D) Hybridising the DNA with a DNA probe            Answer: (A)

8. Ovule integument gets transformed into

(A) seed
(B) fruit wall
(C) seed coat
(D) cotyledons            Answer: (C)

9 Osteomalacia is a deficiency disease of

(A) Infants due to protein energy malnutrition
(B) Adults due ot protein energy malnutrition
(C) Adults due to Vitamin D deficiency
(D) Infants due to Vitamin K deficiency            Answer: (C)

10. Nosema bombycis which causes pebrine in silk worms is a

(A) Virus
(B) Bacterium
(C) Protozoan
(D) Fungus           Answer: (C)

11. Name the hormone that has no role in menstruation.

(A) LH
(B) FSH
(C) GH
(D) TSH         Answer: (C)

12.  Name the following having oxygen storing capacity

(A) Myoglobin
(B) Prophase II
(C) Anaphase I
(D) Metaphase II             Answer: (A)

13. Movement of tongue muscle is controlled by

(A) facial nerve
(B) trigeminal nerve
(C) hypoglossal nerve
(D) vagus nerve           Answer: (C)

14. Pick the mammal with true placenta

(A) Kangaroo
(B) Echidna
(C) Platypus
(D) Mongoose         Answer: (D)

15.Most of the endangered species are the victims of

(A) Habitat destruction
(B) Over-hunting
(C) Acid rain
(D) Competition with introduced species            Answer: (A)

16. Bovine spongiform encephalopathy is a disease caused by prions in a _______.

(A) cow
(B) sheep
(C) man
(D) potato Answer: (A)

17. Blood stains are found at the site of a murder. lf DNA profiling technique is to be used for identifying the criminal, which of the following is ideal for use?

(A) Erythrocytes
(B) Leucocytes
(C) Platelets
(D) Serum Answer: (B)

18. BT brinjal is an example of transgenic crops. In this, BT refers to

(A) Bacillus tuberculosis
(B) Biotechnology
(C) Betacarotene
(D) Bacillus thuringiensis Answer: (D)

19. BY the statement ‘survival of the fittest’, Darwin meant that ________.

(A) The strongest of all species survives
(B) The most intelligent of the species survives
(C) The cleverest of the species survives
(D) The most adaptable of the species to changes survives Answer: (D)

20. Casparian strips are present in the ________ of the root.

(A) epiblema
(B) cortex
(C) perycycle
(D) endodermis Answer: (D)