In Bt cotton, the Bt toxin present in plant tissue as
protoxin is converted into active toxin due to
(a) action of gut microorganisms
(b) presence of conversion factors in insect gut
(c) alkaline pH of the insect gut
(d) acidic pH of the insect gut.

1 Answer

Answer :

(c) alkaline pH of the insect gut

Related questions

Description : What is true about Bt toxin? (a) Bt protein exists as active toxin in the Bacillus. (b) The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication. ... Bacillus has antitoxins. (d) The inactive protoxin gets converted into active form in the insect gut.

Last Answer : (d) The inactive protoxin gets converted into active form in the insect gut.

Description : What triggers activation of protoxin to active toxin of Bacillus thuringiensis in bollworm? (a) Acidic pH of stomach (b) Body temperature (c) Moist surface of midgut (d) Alkaline pH of gut

Last Answer : (d) Alkaline pH of gut

Description : Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to (a) insect pests (b) fungal diseases (c) plant nematodes (d) insect predators.

Last Answer : (a) insect pests

Description : Bt cotton is resistant to bollworm, it is due to (a) Bt is repellent to bollworm(b) Bt is contact poison for bollworm (c) Bt is stomach poison; it changes the permeability of stomach due to generation of pores in alkaline environment of stomach (d) Bt is causing death due to asphagsiation of insect

Last Answer : (c) Bt is stomach poison; it changes the permeability of stomach due to generation of pores in alkaline environment of stomach

Description : Explain the mode of action of bt toxin on insects -Science

Last Answer : answer:

Description : The first line of host defense is the barrier presented to the external environment. Which of the following statement(s) is/are true concerning host barriers? a. Sebaceous glands secrete ... of the upper gastrointestinal tract d. Gut peristalsis serves to prevent microbial adherence and invasion

Last Answer : Answer: b, c, d The skin, mucus membranes, and epithelial layers of various organs of the body constitute effective physical barriers against microbial invasion. In certain portions of the ... very low pH within the stomach and gut peristalsis both serve to prevent microbial adherence and invasion

Description : Bacillus thuringiensis forms protein crystals which contain insecticidal protein. This protein (a) binds with epithelial cells of midgut of the insect pest ultimately killing it (b) is coded by several ... pest (d) does not kill the carrier bacterium which is itself resistant to this toxin.

Last Answer : (a) binds with epithelial cells of midgut of the insect pest ultimately killing it

Description : Asseriton: Insect resistant transgenic cotton has been produced by inserting Bt gene Reason The Bt gene is derived form a bacterium

Last Answer : Asseriton: Insect resistant transgenic cotton has been produced by inserting Bt gene Reason The Bt ... If both the assertion and reason are false

Description : Omeprazole exerts practically no other action except inhibition of gastric acid secretion because: A. It transforms into the active cationic forms only in the acidic pH of the gastric juice B. Its ... forms are unable to diffuse out from the gastric parietal cell canaliculi D. All of the above

Last Answer : D. All of the above

Description : .In functional allelopathy a). Toxic substances are released as such from the plants b). A precursor is released and is converted into active substances by some microorganisms c). No release of any toxic substance d). release of nitrogen from nodule of legume takes place

Last Answer : b). A precursor is released and is converted into active substances by some microorganisms

Description : 10. Bt” toxin is : (a) Intracellular lipid (b) Intracellular crystalline protein (c) Extra cellular crystalline protein (d) Lipid

Last Answer : (b) Intracellular crystalline protein

Description : If the pH value of sewage is 7 A. It is acidic B. It is alkaline C. It is neutral D. None of these

Last Answer : ANS: C

Description : Pick up the correct statement from the following: A. pH value indicates acidity and alkalinity of sewage B. In acidic sewage, the pH value is less than 7 C. In alkaline sewage, the pH value is more than 7 D. All the above

Last Answer : ANS: D

Description : Light water' used as a coolant in nuclear reactor is nothing but (A) Ordinary water (B) Mildly acidic (pH = 6) water (C) Mildly alkaline (pH = 8) water (D) None of these

Last Answer : (A) Ordinary water

Description : Water having pH value as 6, is (A) Alkaline (B) Acidic (C) Neutral (D) None of these

Last Answer : (B) Acidic

Description : If pH value of water is (A) 7 water it is said to be neutral (B) Less than 7 it is said to be acidic (C) More than 7 it is said to be alkaline (D) All the above

Last Answer : (D) All the above

Description : Pick up the correct statement from the following: (A) A soil having pH value more than 7 is an acidic soil (B) A soil having pH value less than 7 is an acidic soil (C) A soil ... more than 7 is an alkaline soil (D) A soil containing chemicals for the manufacture of Portland cement is preferred

Last Answer : Answer: Option B

Description : Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution (A) A1is more alkaline than solution A2 (B) A1is highly acidic (C) A2is very slightly acidic (D) Both (B) & (C)

Last Answer : (D) Both (B) & (C)

Description : If the pH value of sewage is (a) it is acidic (b) it is alkaline (c) it is neutral* (e) None of these

Last Answer : (c) it is neutral*

Description : Which of the following statement(s) concerning the gut microflora is/are correct? a. Gut microflora evolves constantly throughout development b. The gut microflora can contribute to the physical and ... the colon, anaerobic organisms outnumber aerobic organisms in a ratio in excess of 100:1

Last Answer : Answer: b, d The composition of the gut microflora is established in neonates after ingestion of microbes that are acquired during contamination from the birth canal and during initial feeding, and ... small number of aerobes are present, these microbes being outnumbered 100-300 to 1 by anaerobes

Description : Under certain circumstances, the gut may become a source of sepsis and serve as the motor of systemic inflammatory response syndrome. Microbial translocation is the process by which microorganisms ... intestinal mucosal permeability c. Decreased host defense mechanisms d. Lack of enteral feeding

Last Answer : Answer: a, b, c, d 99 Translocation is promoted in three general ways: 1) altered permeability of the intestinal mucosa as caused by shock, sepsis, distant injury, or cell toxins; 2) ... trauma patient d. Fifty percent of non-nitrogen caloric requirements should be provided in the form of fat

Description : Which of the following statements is false about toluene? (a) can be prepared by treating benzene with methyl chloride in the presence of AlCl3. (b) is converted to benzoic acid on refluxing with ... (d) can be nitrated with concentrated nitric acid to give a mixture of ortho and meta nitrotoluene.

Last Answer : can be nitrated with concentrated nitric acid to give a mixture of ortho and meta nitrotoluene

Description : Which one of the following statements is false in respect of viability of mammalian sperm? (a) Sperm is viable for only up to 24 hours. (b) Survival of sperm depends on the pH of the ... ) Viability of sperm is determined by its motility. (d) Sperms must be concentrated in a thick suspension.

Last Answer : (a) Sperm is viable for only up to 24 hours.

Description : 70. Which one of the following statements is false in respect of viability of mammalian sperm ? (1) Sperms must be concentrated in a thick suspension (2) Sperm is viable for only up to 24 hours ... the medium and is more active in alkaline medium (4) Viability of sperm is determined by its motility

Last Answer : Sperm is viable for only up to 24 hours

Description : Which one of the following is an example of carrying out biological control of pests/diseases using microbes? (a) Trichoderma sp. against certain plant pathogens. (b) Nucleopolyhedrovirus against white rust ... c) Bt-cotton to increase cotton yield. (d) Lady bird beetle against aphids in mustard.

Last Answer : (a) Trichoderma sp. against certain plant pathogens.

Description : Which one of the following is an example of carrying out biological control of pests/diseases using microbes ? (1) Lady bird beetle against aphids in mustard (2) Trichoderma sp. against ... pathgens (3) Nucleopolyhedrovirus against white rust in Brassica (4) Bt-cotton to increase cotton yield

Last Answer : (2) Trichoderma sp. against certain plant pathgens

Description : Suppuration is mainly the result of the combined action of four factors; which of the following is not one of these factors?CHECK A. Necrosis B. Presence of lymphocytes C. Collection of neutrophils D. Accumulation of tissue fluid E. Autolysis by proteolytic enzymes

Last Answer : B. Presence of lymphocytes

Description : Which of the following statements is not correct? (a) Lysosomes are formed by the process of packaging in the endoplasmic reticulum. (b) Lysosomes have numerous hydrolytic enzymes. (c) The hydrolytic enzymes of lysosomes are active under acidic pH. (d) Lysosomes are membrane-bound structures.

Last Answer : (a) Lysosomes are formed by the process of packaging in the endoplasmic reticulum.

Description : Neostigmine is beneficial in cobra envenomation because: A. It binds to and inactivates cobra toxin B. It reverses coma due to cobra toxin C. It counteracts the cardio-depressant action of cobra toxin D. It antagonizes the paralysing action of cobra toxin

Last Answer : D. It antagonizes the paralysing action of cobra toxin

Description : Neostigmine is beneficial in cobra envenomation because: A. It binds to and inactivates cobra toxin B. It reverses coma due to cobra toxin C. It counteracts the cardio-depressant action of cobra toxin D. It antagonizes the paralysing action of cobra toxin

Last Answer : D. It antagonizes the paralysing action of cobra toxin

Description : Crude oil is sometimes termed sweet because it is – (1) sweet in taste due to dissolved sugars (2) mildly sweet due to low sulphur content (3) less acidic (4) less alkaline

Last Answer : (2) mildly sweet due to low sulphur content Explanation: Crude oil is sometimes termed sweet amount of hydrogen sulphide and Carbon dioxide.

Description : Crude oil is sometimes termed sweet because it is : (1) sweet in taste due to dissolved sugars (2) mildly sweet due to low sulphur content (3) less acidic (4) less alkaline

Last Answer : mildly sweet due to low sulphur content

Description : Species of Trypanosomes develop in the posterior portion of the insect gut are called as A A. Stercoraria B. Salivaria C. Both D. None

Last Answer : Stercoraria

Description : Species of Trypanosomes develop in the anterior portion of the insect gut are called as B A. Stercoraria B. Salivaria C. Both D. None

Last Answer : Salivaria

Description : A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap? (a) Acidic (b) Alkaline (c) Low refractive index (d) Absence of sugar

Last Answer : (b) Alkaline

Description : Excessive use of chemical fertilisers causes shrivelling of the roots and wilting of the plant, because the (A) Osmotic pressure of the soil water becomes less than that of the plant sap (B) Soil ... pressure of the soil water becomes higher than that of the plant sap (D) Soil becomes too acidic

Last Answer : (C) Osmotic pressure of the soil water becomes higher than that of the plant sa

Description : Cultivation of Bt Cotton has been much in the news . The prefix "Bt" means

Last Answer : Cultivation of Bt Cotton has been much in the news . The prefix "Bt" means A. ... ligases D. carrying an endotoxin gene from bacillus thuringiensis

Description : Bt cotton is

Last Answer : Bt cotton is A. Transgenic plant B. Mutated plant C. Cloned plant D. Hydrid plant

Description : Study statement a-d (about organic farming) and find out the correct ones. (a) Utilises genetically modified crops like Bt cotton (b) Uses only natura

Last Answer : Study statement a-d (about organic farming) and find out the correct ones. (a) Utilises genetically modified crops ... . a and b only D. b and c only

Description : Bt genes are introduced in cotton against the pest

Last Answer : Ans. Cotton Bollworm

Description : Bt cotton is resistant against the pest

Last Answer : Ans.Helicoverpa (Spotted bollworm) 19. Jute

Description : Bt seed is associated with - (1) Rice (2) Wheat (3) Cotton (4) Oil seeds

Last Answer : (3) Cotton Explanation: Cotton is the most popular of the Bt crops: it was planted on about 1 .8 million acres (728437 ha) in 1996 and 1997. The Bt gene was isolated and transferred ... genetically into the cotton seeds, protects the plants from bollworm (A. lepidoptora), a major pest of cotton.

Description : Write a note on BT Cotton.

Last Answer : BT Cotton is a genetically modified or transgenic plant. It is a new variety in which a gene isolated from a bacterium called Bacillus thuringiensis has been newly introduced. The gene us responsible for producing a toxin which can kill the boll worm that attack the cotton plants.

Description : Select the correct statement about biodiversity. (a) The desert areas of Rajasthan and Gujarat have a very high level of desert animal species as well as numerous rare animals. (b) Large scale ... and endemism. (d) Conservation of biodiversity is just a fad pursued by the developed countries.

Last Answer : (c) Western ghats have a very high degree of species richness and endemism.

Description : Match the following columns and select the correct option. 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 ... (i) (iv) (c) (ii) (iii) (iv) (i) (d) (i) (ii) (iii) (iv)

Last Answer : (a) (iv) (i) (ii) (iii)

Description : Some of the characteristics of Bt cotton are (a) long fibre and resistance to aphids (b) medium yield, long fibre and resistance to beetle pests (c) high yield and production of toxic protein crystals which kill dipteran pests (d) high yield and resistance to bollworms.

Last Answer : (d) high yield and resistance to bollworms.

Description : Which of the following Bt crops is being grown in India by the farmers? (a) Brinjal (b) Soybean (c) Maize (d) Cotton

Last Answer : (d) Cotton

Description : Consider the following statements (A-D) about organic farming. (A) Utilizes genetically modified crops like Bt cotton (B) Uses only naturally produced inputs like compost (C) Does not use pesticides and urea (D) Produces vegetables ... C and D (b) C and D only (c) B and C only (d) A and B only

Last Answer : (c) B and C only

Description : The area under Bt – cotton in India is about (A) 6.4 mha (B) 5.4 mha (C) 4.4 mha (D) 3.4 mha

Last Answer : (A) 6.4 mha

Description : In India Bt cotton is released for commercial cultivation in the year — a. 2000 b. 2002 c. 2006 d. 2009

Last Answer : b. 2002