List of top Biology Questions

Fixation of one CO2 molecule through Calvin cycle requires.

Match the following columns

Column I		Column II
A	Sacral nerves	1	1 Pair
B	Thoraic nerves	2	8 Pairs
C	Cocygeal nerves	3	7 Pairs
D	Cervical nerves	4	12 Pairs
			5 Pairs

Oxygen dissociation curve of haemoglobin is

Intrinsic and extrinsic pathways of blood clotting are interlinked at the activation steps of which of the following factors?

Pick the hormone which is not secreted by human placenta.

A hormone, secreted by the endocrinal cells of duodenal mucosa which influences the release of pancreatic juice is

Cotyledons and testa are edible parts of

One of the breeding techniques useful to eliminate harmful recessive genes by selection is

Some functions of nutrient element are given below
(I) Important constituent of proteins involved in ETS. 
(II) Activator of catalase. 
(III) Important constituent of cytochrome.
(IV) Essential for chlorophyll synthesis.
The concerned nutrient is

Torsion of visceral mass is seen in animals belonging to class

Statement I Microtubules are formed only in animals cells.
Statement II Microtubules are made up of a protein called myosin. 
Choose the correct option

Herbicide that blocks electron transport from PS-II to PS-I by inhibiting electron flow between plastoquinone \(\rightarrow\)cytochrome is

A plant is provided with ideal conditions for photosynthesis and supplied with isotope 14 CO2. When the products of the process are analyzed carefully, what would be the nature of products?

Double fertilization is exhibited by :

Which one of the following is related to Ex-situ conservation of threatened animals and plants ?

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?

An example of colonial alga is :

Which ecosystem has the maximum biomass ?

Life cycle of Ectocarpus and Fucus respectively are:

Identify the wrong statement in context of heartwood:

Zygotic meiosis is characteristic of ;

Select the correct route for the passage of sperms in male frogs :

Which of the following is made up of dead cells?

The number of roots of equation $\cos \, x + \cos \, 2x + \cos \, 3x = 0$ is $(0 \le x \le 2 \pi )$.

A disease caused by an autosomal primary non- disjunction is: