Argobacterium is responsible for
1. Crown gall tumors in plants
2. Nitrogen fixation in the soil
3. Citrus cankar disease
4. Witches broom disease

A human female reaches menopause around the age of

 (1) 15 years
 (2) 70 years
 (3) 50 years
 (4) 25 years

The length of potentiometer wire is 10 cm. and resistance is 0.005 ohm /cm. A battery of 2 Volt emf and 1.5  ohm internal resistance is connected to the wire will have potential gradient :

(1) 4 x 10^-4 v/cm.
(2) 0.05 v/cm.
(3) 0.5 v/cm.
(4) 0.005 v/cm.

A cross between F1 hybrid and the recessive parent is called

 (1) Test Cross
 (2) Trihybrid Cross
 (3) Dihybrid Cross
 (4) Monohybrid Cross

A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum 20 m/s² at a distance of 5 m from the moving position. The time period of oscillation is?

1) 2s
2) 2πs
3) 1s
4) πs

What do plants and animals have in common?
 1) both are heterotrophic
 2) both are autotrophic
 3) both are prokaryotic
 4) both are eukaryotic

Study the four statements (I-IV) given below and select the two correct ones out of them:
I. Definition of biological species was given by Ernst Mayr.
II. Photoperiod does not affect reproduction in plants.
III. Binomial nomenclature system was given by RH Whittaker.
IV. In unicellular organisms, reproduction is synonymous with growth.

The two correct statements are :
1) II and III.
2) III and IV.
3) I and IV.
4) I and II.

In a dicotyledonous stem, the sequence of tissues from the outside to the inside is

1) Phellem, Pericycle, Endodermis, Phloem
2) Phellem, Phloem, Endodermis, Pericycle
3) Phellem, Endodermis, Pericycle, Phloem
4) Pericyle, Phellem, Endodermis, Phloem

The ratio of the time periods for two satellites of equal mass in circular orbits of radii R and 16 R is
 
 1) 1 : 64
 2) 1 : 16
 3) 16 : 1
 4) 64 : 1

When a beam of 10.6 eV photons of intensity 2.0 W/m² falls on a platinum surface of area 1.0×10⁻⁴ m and work function 5.6 eV, 0.53% of the incident photons eject photoelectrons. Find the number of photoelectrons emitted per second 

1) 6.25×10⁸
2) 1.25×10⁹
3) 1.25×10⁶
4) 6.25×10¹¹