List of practice Questions

Identify the correct sequence of steps in the formation of root nodules in legumes:
[a.] Formation of infection thread
[b.] Curling of root hair
[c.] Stimulation of cell division in cortex and pericycle
[d.] Release of sugars and amino acids by legume roots
[e.] Release of bacteria into cortical cells

Assertion (A): Super weeds are fast growing than crops and resistant to weedicides.
Reason (R): There is transfer of new genes into related wild species through natural out crossing.

The evolutionary force that reduces the genetic variation by removing low frequency alleles

Identify the fungal disease among the following

Identify the organisms based on their cell wall characteristics such as pseudomurein, mycolic acid, stiff cellulose plates, chitin.

Assertion (A): Dry dehiscent fruits are usually single seeded.
Reason (R): Tridax fruit is cypsella with pappus like calyx.

Assertion (A): Pollen banks can be used in crop breeding programs.
Reason (R): Pollen grains can be stored for many years in liquid nitrogen.

Select the incorrect statements related to anatomical characters from the following
I) Endodermis is a part of the stele.
II) Endodermis with casparian strips are found in the dicot stem.
III) Bulliform cells are found in the upper epidermis of the isobilateral leaf.
IV) Vascular bundles are open in monocot stems.

Among the following, mention diseases that have existed in the past but are now showing incidence in new geographical areas.

Reciprocal translocation of chromosomal pieces between 9 & 22 chromosomes leads to

Match the following
List I orthotropus

Choose the incorrect pair among the following

A. Biosphere reserve - Indo Burma region
B. Aravalli Hills - Rajasthan and Gujarat
C. Koringa sanctuary - Uttarakhand
D. Biodiversity hotspot - Himalayan region

In hymenopteran insects the unfertilized eggs develop into:

Diabetes is related to this gland

Dodder plant (Cuscuta) belongs to __ family.

Name the cells of mature pollen grain when you observe under microscope with the following characters respectively,
A) Bigger cell with abundant food reserve and large irregular shaped nucleus.
B) Small, dense cytoplasm with nucleus.

Artificial insemination means

Cells derived from any of the three germ layers are

Co factor that forms coordination bonds with side chains at active site of enzyme

Match the following

Set I		Set II		Set III
I.	DNA Ligase	A.	Polymerisation	i.	Okazaki fragments
II.	DNA Polymerase	B.	Introns	ii.	Reactive & unstable
III.	Splicing	C.	Joining	iii.	mRNA
IV.	Ribozyme	D.	RNA Enzyme	iv.	One direction

Select the set of characters equally shared by reptiles and aves among the following

Assertion (A): Dengue fever is caused due to failure of clot reaction.
Reason (R): The patient of dengue may require transfusion of blood platelets.

Erythropoietin hormone is produced by

Identify the correct combination.
A. Agrobacterium tumefaciens – vector for transgenic plant.
B. Escherichia coli – selectable marker.
C.Thermus aquaticus – Taq polymerase.
D.Bacillus thuringiensis – BT. Toxin.

Arrange the following events in the correct sequence during the process of fertilization in Angiosperms: I. Fusion of other male gamete with polar nuclei
II. Transfer of pollen grains from anther to stigma
III. Fusion of male gamete with egg nucleus
IV. Release of male gametes into cytoplasm synergid
V. Pollen tube formation