AIIMS Zoology Class 11 Questions

During vigorous exercise sufficient oxygen is not available to meet the required energy, so energy is derived through conversion of pyruvic acid to lactic acid.

If mitochondria is absent in mature RBC what will be the source of energy:

In cockroach

Free swimming, radially symmetrical animals with cnidocytes belong to

Match the following columns and select the correct option.

Which is not true for cockroach?

Which of the following integrates Nervous and endocrine system

Choose the correct difference from the following

Identify the given diagram of tissue performing secretion and absorption

Characteristics of female cockroach

Cervical vertebrae differ from other vertebra in having -

Protein on reaction with which yields Ruhemann's purple?

Which cell is found in mucus secreting organs.

Blood circulation in earthworm is :

Which maintains static equilibrium -

Blood group of the father is A and blood group of mother is B. Then predict the blood group of the progeny -

Skeletal muscles are controlled by -

Which of the following options have features corresponding to the given animals

Choose the correct option for the labelling in the given diagram (A, B, C, D)

Myosin head separates from actin when:

Which statement is incorrect for earthworm

Position of testis in Periplaneta americana

A single female genital pore is present on the 14^{th} segment through which female reproductive bodies (ova) are discharged during copulation. The segments 14-16 of a matured

Enzymes are of various types depending on their action. Hydrolases catalyses the hydrolysis of ester, ether, peptide, glycosidic, C⁻C, C⁻halide, P⁻N bonds etc. They are formed by dehydration and condensation. Hydrolases break up large molecules into smaller ones with the help of hydrogen and hydroxyl groups of water molecules. This phenomenon is called

Assertion: Malpighian tubules are excretory organs in most of the insects

Blood pressure is the arterial pressure of blood exerted on the wall of arteries with each heart beat. It is measured from the brachial artery in the elbow pit. It is expressed as, systolic pressure (mm/Hg) / diastolic pressure (mm/Hg). Arterial (Superficial; arteries) blood pressure is measured by sphygmomanometer.

Essential amino acids are those which are taken from food and not synthesized in the body whereas non-essential amino acids need not be supplied in the diet and are synthesized in the body. Glycine, serine and tyrosine are non-essential amino acids.

Assertion: Acraniata is a group of organisms which do not have distinct cranium. Reason: It includes small marine forms without head.

Na and K concentration changes across the muscle cell membrane resulting in development of potential difference. So, Na and K ions are necessary for muscle contraction. Thus, both assertion and reason are true.

Schizocoelomates and enterocoelomates are

Cestoda are distinguished from other flatworms by the absence by

Which one of the following is referred as ‘living fossils’?

Match the following columns.

Haversian canal in the bone of mammals are connected by small blood vessel canal called

In old age, stiffness of joints is due to the

Node of Ranvier occurs where

In the homeostatic control of blood sugar level, which organs function as modulator and effector respectively?

Which one of the following human organs is called the ‘graveyard of RBCs’?

The²⁴⁻hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone

Assertion (A) Coacervates are believed to be the precursors of life. Reason (R) Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules.

Assertion (A) A co-enzyme or metal ion that is very tightly bound to enzyme protein called prosthetic group. Reason (R) A complete, catalytically active enzyme together with its bound prosthetic group is called apoenzyme.

A person sitting at rest experiences a temporary cessation of breathing after forced deep breathing for a few minutes. This is due to

What is not a common feature is Periplaneta and Scorpions?

A gland called ‘Clock of ageing’ that gradually reduces and degenerates in ageing is

Which of the following is correct regarding respiration in adult frog?

Na⁺/K⁺ pump is associated with

During muscular contraction, which of the following events occur? (i) H⁻zone disappears (ii) A band widens (iii) I band reduces in width (iv) Width of A band is unaffected (v) M line and Z line come closer.

The release of chemical messenger from synaptic vesicles is under the influence of these ion(s).

Catecholamine in a normal person induces

Select the option having all the correct matches. Structure Percentage Function