A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called

Mitochondria and chloroplast are (a) semi-autonomous organelles (b) formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery. Which one of the following options is correct?

In context of amniocentesis, which of the following statement is incorrect?

In a chloroplast the highest number of protons are found in

Photosensitive compound in human eye is made up of

Spindle fibres attach on to

Which is the National Aquatic Animal of India?

Which of the following is required as inducer(s) for the expression of Lac operon?

Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?

Microtubules are the constituents of

A complex of ribosomes attached to a single strand of RNA is known as

Fertilization in humans is practically feasible only if

Asthma may be attributed to

The avena curvature is used for bioassay of

The standard petal of a papilionaceous corolla is also called

Tricarpellary, syncarpous gynoecium is found in flowers of

One of the major components of cell wall of most fungi is

Select the incorrect statement

In meiosis, crossing over is initiated at

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F₁ plants were selfed, the resulting genotypes were in the ratio of

Which of the following is the most important cause of animals and plants being driven to extinction?

Which one of the following is a characteristic feature of cropland ecosystem?

Changes in GnRH pulse frequency in females is controlled by circulating levels of

Which of the following is not a feature of plasmids?

Which of the following features is not present in Periplaneta americana?

In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to

Joint Forest Management Concept was introduced in India during

Pick out the correct statements$\\ (a)$Haemophilia is a sex-linked recessive disease.$\\ (b)$Down’s syndrome is due to aneuploidy.$\\ (c)$Phenylketonuria is an autosomal recessive gene disorder.$\\ (d)$Sickle cell anaemia is an X-linked recessive gene disorder.

Which one of the following statements is wrong?

Proximal end of the filament of stamen is attached to the

Which of the following approaches does not give the defined action of contraceptive?

The taq polymerase enzyme is obtained from

Identify the correct statement on inhibin.

Which part of the tobacco plant is infected by $Meloidogyne incognita$?

Antivenom injection contains preformed antibodies while polio drops that are administered into the body contain

Which one of the following cell organelles is enclosed by a single membrane?

Lack of relaxation between successive stimuli in sustained muscle contraction is known as

Which of the following is not a stem modification?

Water soluble pigments found in plant cell vacuoles are

Select the correct statement

Which of the following is not required for any of the techniques of DNA fingerprinting available at present?

Which type of tissue correctly matches with its location?

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures, and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?

Which of the following structures is homologous to the wing of a bird?

Which of the following characteristic features always holds true for the corresponding group of animals?

Which of the following statements is not true for cancer cells in relation to mutations?

The amino acid Tryptophan is the precursor for the synthesis of

Following are the two statements regarding the origin of life$\\ (a)$The earliest organisms that appeared on the earth were non-green and presumably anaerobes.$\\ (b)$The first autotrophic organisms were the chemoautotrophs that never released oxygen.$\\$On the above statements which one of the following options is correct?

Reduction in pH of blood will

Analogous structures are a result of

Which of the following is a restriction endonuclease?

The term ecosystem was coined by

Which one of the following statements is wrong?

In bryophytes and pteridophytes, transport of male gametes requires

When does the growth rate of a population following the logistic model equal zero? The logistic model is given as$\\ dN/dt = rN(1 - N/K)$

Which one of the following statements is not true?

Which of the following would appear as the pioneer organisms on bare rocks?

Which one of the following is the starter codon?

Which one of the following characteristics is not shared by birds and mammals?

Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature?

Blood pressure in the pulmonary artery is

Cotyledon of maize grain is called

In the stomach, gastric acid is secreted by the

Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers?

Chrysophytes, Euglenoids, Dinoflagellates, and Slime moulds are included in the kingdom

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options

In mammals, which blood vessel would normally carry the largest amount of urea?

Seed formation without fertilization in flowering plants involves the process of

Which of the following is wrongly matched pair of microbe-product-application in the given table?$$

In a testcross involving F$_1$ dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates

It is much easier for a small animal to run uphill than for a large animal, because

Which of the following is not a characteristic feature during mitosis in somatic cells?

Which of the following statements is not correct?

Specialized epidermal cells surrounding the guard cells are called

Which of the following guards the opening of the hepatopancreatic duct into the duodenum?

Stems modified into flat green organs performing the functions of leaves are known as

The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals include the

A river with an inflow of domestic sewage rich in organic waste may result in

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in

A typical fat molecule is made up of

Gause’s principle of competitive exclusion states that

The two polypeptides of human insulin are linked together by

The coconut water from tender coconut represents

Which of the following statements is wrong for viroids?

Which of the following features is not present in the Phylum-Arthropoda?

Which of the following most appropriately describes haemophilia?

Emerson’s enhancement effect and Red drop have been instrumental in the discovery of

In which of the following all three are macronutrients?

Name the chronic respiratory disorder caused mainly by cigarette smoking.