List of top Biology Questions

Identify the correct statement.

Consider the following statements & choose the correct answer from the given options.
Statement 1: Innermost layer of microsporangium is tapetum.
Statement 2: Cells of tapetum possess dense cytoplasm more than one nucleus and nourishes developing pollen grains.

In Bryophytes & Pteridophytes the number of male gametes produced is several thousand times the numbe of female gametes produced.
Reason : Large number of male gametes fail to reach the female gametes during transport.

How many microsporangia are located at the corners of a typical bilobed anther of angiosperm ?

Gemmae are present in:

Following are the statements about prostomium of earthworm.
(a) It serves as a covering for mouth.
(b) It helps to open cracks in the soil into which it can crawl.
(c) It is one of the sensory structures.
(d) It is the first body segment.
Choose the correct answer from the options given below

The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is :

Which of these is not an important component of initiation of parturition in humans

Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins

The Adenosine deaminase deficiency results into

Which of the following characteristics is incorrect with respect to cockroach ?

Veneral diseases can spread through : (a) Using sterile needles (b) Transfusion of blood from infected person (c) Infected mother to fetus (d) Kissing (e) Inheritance Choose the correct answer from the options given below

A bacterial flagellum is composed of

During the process of gene amplification using PCR, if very high temperature is not maintained in the beginning, then which of the following steps of PCR will be affected first ?

For effective treatment of the disease, early diagnosis and understanding its pathophysiology is very important. Which of the following molecular diagnostic techniques is very useful for early detection

Relate Column I with Column II with regard to predatory behaviour:

	Column I		Column II
1.	Calotropis	p.	Invertebrates
2.	Pisaster	q.	Distasteful
3.	Monarch butterfly	r.	Cryptically colored
4.	Frogs	s.	Cardioglycoside

Match the following columns and select the correct option.

Column I		Column II
A	Floating Ribs	I	Located between second and seventh ribs
B	Acromion	II	Head of the Humerus
C	Scapula	III	Clavicle
D	Glenoid cavity	IV	Do not connect with the sternum

Match the following columns and select the correct option.

Column I		Column II
A	Pituitary gland	I	Grave's disease
B	Thyroid gland	II	Diabetes mellitus
C	Adrenal gland	III	Diabetes insipidus
D	Pancreas	IV	Addison's disease

In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?

Presence of which of the following conditions in urine are indicative of Diabetes Mellitus ? (1) Uremia and Ketonuria (2) Uremia and Renal Calculi (3) Ketonuria and Glycosuria (4) Renal calculi and Hyperglycaemia

The specific palindromic sequence which is recognized by EcoRI is:

Match the following with respect to meiosis:

	Column I		Column II
A	Bt cotton	I	Gene therapy
B	Adenosine	II	Cellular defence deaminase deficiency
C	RNAi	III	Detection of HIV infection
D	PCR	IV	Bacillus thuringiensis

Match the following concerning essential elements and their functions in plants:

a	Iron	i	Photolysis of water
b	Zinc	ii	Pollen germination
c	Boron	iii	Required for chlorophyll biosynthesis
d	Manganese	iv	IAA biosynthesis

Identify the substances having glycosidic bond and peptide bond, respectively in their structure :