List of top Biology Questions

'Aves' taxonomically represent a

Auxin was first isolated from

Auxin regulates cell growth by which of the following mechanisms ?

Avena coleoptile test to find out the quantity of growth promoting hormones was discovered by -

ATPase of the muscle is located in

Automatic growth measuring instrument is

Autogamy can occur in a chasmogamous flower if

Autecology is the

Atactostele having fibrovascular bundles occurs in

Astragalus and calcaneum are part of

Association between mycobiont and phycobiont are found in

Water hyacinth is an invasive aquatic plant which spreads all over the water in a short period of time. Water hyacinth can reproduce vegetatively.

Visceral muscles are smooth in appearance. Many muscle cells assemble in a branching pattern to form a visceral muscle

Vestibular apparatus helps us in maintaining balance of body and posture Due to the arrangement of semicircular canals of vestibular apparatus, movement of head in any direction will stimulate sensory cells to maintain dynamic equilibrium

Virus is an obligate parasite. Virus is host specific.

Type $'O'$ blood group individuals are called 'universal donors'. $RBCs$ of $'O'$ blood group have both $'A'$ and $'B'$ surface antigens.

$USA's$ patent of brazzein is an example of biopiracy. Brazzein a protein obtained from West African plant, Pentadiplandra brazzeana and the gene encoding it has been patented by $USA$.

Two kingdom classification was insufficient. Majority of organisms did not fall into either of the categories in two kingdom classification.

Tracheae, primary, secondary and tertiary bronchi are supported by incomplete cartilaginous rings. These rings of cartilage make the wall non-collapsible.

There is no mixing of oxygenated and deoxygenated blood in the human heart. Valves are present in the heart which allows the movement of blood in one direction only.

Turner's syndrome is caused due to absence of any one of the $X$ and $Y$ sex chromosome. Such individuals show masculine as well as feminine development.

The stroma lamellae have both $PS I$ and $PS II$. The grana lamellae lack $PS II$ as well as $NADP $reductase enzyme.

There is hepatic portal system in frogs It is venous connection between liver and intestine in frog

The trichomes in the shoot system are usually multicellular. The trichomes help in preventing water loss due to evaporation.

The resting membrane of the neuron exhibits polarity of charges The outer surface of the axonal membrane possesses a negative charge while its inner surface becomes positively charged