Smooth leaved and nectarless cotton vari...

Smooth leaved and nectarless cotton varieties do not attract

Aphids

Bollworm

Jessids

Shoot borer

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Smooth leaved and nectar less cotton varieties do not attract which one of following pests

Read of the following statements:- (a) Insect resistance in crop plants may be due to morphological, biochemical or physiological characteristics. (b) Hairy leaves in cotton are resistant to cereal jassids. (c) Smooth leaves and nectar-less cotton varieties do not attract bollworms. (d) In maize, high asparatic acids, low nitrogen and sugar leads to resistance to stemborers. Choose correct statements :-

Fill in the blanks with appropriate words. (i) Resistance to the most plants is the ability to prevent the pathogen from causing disease and is determined by the "______" . (ii) Smooth leaved and "______" cotton vaneties do not attract bollworms. (iii) It has been possible to develop and iron fortified "______" variety containing over five times as much iron as commonly consumed verieties.

Which of the following statements is correct regarding nectarless cotton varieties?

Hairy leaved cotton is resistant to:

Assertion : Young leaves in Poinsettia are brightly coloured to attract pollinator and achieve pollination . Reason : It is only color which can attract the pollinator on all plants .

A large solid sphere of diameter d attracts a small particle with a force F. If the central portion of the sphere of diameter (d)/(2) be removed leaving behind a cavity, then the new force of attraction becomes

Cut pieces of beetroot do not leave the colour in cold water but do so in hot water. Explain.

Assertion :- Both wind and water pollinated flowers are not very colourful and do not produce nectar. Reason :- Colour and nectar act as insect attractant.

Assertion : The leaves in gymnosperms are well adapted to withstand extremes of temperature, humidity and wind Reason : Unlike bryophytes and pteridophytes, in gymnosperms the male and female gametophytes do not have an independent free living existence.

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