List of practice Questions

(i) A rectangular loop of sides \( l \) and \( b \) carries a current \( I \) clockwise. Write the magnetic moment \( \vec{m} \) of the loop and show its direction in a diagram.
(ii) The loop is placed in a uniform magnetic field \( \vec{B} \) and is free to rotate about an axis which is perpendicular to \( \vec{B} \). Prove that the loop experiences no net force, but a torque \( \vec{\tau} = \vec{m} \times \vec{B} \).

Choose the correct sequence of different regions on a typical eukaryotic DNA segment when we go from the upstream to the downstream of a transcription start point.
A. Initiation site
B. CAAT box
C. Enhancer
D. TATA box
Choose the correct answer from the options given below:

Plants having half the somatic chromosome number than found in normal individual are called -

The production of haploids by anther and pollen culture was first demonstrated by -

Plants cannot absorb molecular nitrogen from the atmosphere because

Inducing the formation of various vegetative organs from cells or tissues in plant tissue culture is called -

Production of secondary metabolites require the use of -

Media that contain some chemical with unknown chemical composition is called __________ media.

For obtaining pure cultures of bacteria __________ plate method is not used.

Select the correct statements regarding somaclonal variations
A. These variations can also result in unwanted traits.
B. Somaclones have been developed and proved advantageous in several crops.
C. These variations can be used to engineer novel traits.
D. Short term invitro callus and cell suspension, cultures results in somaclonal variation.
Choose the correct answer from the options given below :

In plant tissue culture formation of organ primordia-like shoot or root in callus cells is called -

Who is regarded as father of 'Plant Tissue Culture' (P. T. C.)?

The first androgenic haploid plant product by anther culture was from -

The process of combining cytoplasmic genomes of one parent with nuclear genome of other parent is called -

__________ Molecules of ATP are required to fix one molecule of nitrogen (N2) to 2NH3.

Symbiotic nitrogen fixing bacteria are found in -
A. Azolla
B. Gnetum
C. Anthoceros
D. Cycas
E. Riccia
Choose the correct answer from the options given below :

Important enzymes involved in nitrogen fixation are -

'Pomato' a hybrid of potato and tomato was produced through-

Arrange the following steps in the process of nitrogen cycle in correct sequence:
A. Nitrogen fixation
B. Nitrification
C. Denitrification
D. Assimilation
E. Ammonification
Choose the correct answer from the options given below :

Virus free plants can be grown by : -

Match LIST-I with LIST-II

Choose the correct answer from the options given below:

Arrange the following steps for plant tissue culture (P.T.C.) in correct sequence:
A. Selection of desired material and suitable nutrient media for P. T. C.
B. Inoculation of explants
C. Surface sterilization of explant
D. Transfer of growing cultures
E. Transfer of plantlets to soil in pots
Choose the correct answer from the options given below :

In nitrogen cycle, Ammonification is the process of generating ammonia from-

Match LIST-I with LIST-II

LIST-I		LIST-II
A.	Gene inhibition	I.	Addition of functional gene to their genome to replace missing product
B.	Gene editing	II.	Disarm the product of faulty gene
C.	Gene targeting	III.	CRISPR/Cas9
D.	Gene Augmentation therapy	IV.	Replacement of non-functional gene with normal gene

Choose the correct answer from the options given below:

Conversion of ammonia to nitrates is called -