Select the mismatch from the following.

Cotton – Hairy leaves – Resistance to aphids

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Wheat – Hairy leaves – Resistance to cereal leaf beetle

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Wheat – Solid stems – Resistance to stem sawfly

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Cotton – Smooth leaves – Resistance to bollworms

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Solution

The correct option is A Cotton – Hairy leaves – Resistance to aphids
Insect resistance in host crop plants may be due to morphological, biochemical or physiological characteristics. Hairy leaves in cotton provide resistance to jassids and in wheat resistance to cereal leaf beetle. Solid stems in wheat provide resistance to stem sawfly and smooth leaved, nectar-less cotton varieties do not attract bollworms.

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Q. Match the insect resistant morphological characteristics found in the plants with their corresponding insect pests

\begin{matrix} Column I & Column II (a) & Hairy leaves & (i) & ballworm (b) & Solid stem & (ii) & jassids (c) & Smooth leaves & (iii) & Stemborer (d) & High aspartic acid & (iv) & Stem sawfly \end{matrix}

Q. Select the correct statement(s).

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ii. Pusa Sawani, a variety of Okra is resistant to aphids.

iii Hairiness of leaves provides resistance to insect pests.

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i. Parbhani kranti is a variety of Abelmoschus esculentus which is resistant to yellow mosaic virus.

ii. Smooth leaves and nectarless cotton varieties attract bollworms.

iii. Mung bean is made resistant to the yellow mosaic virus by mutation breeding.

iv. High aspartic acid, low nitrogen and sugar content resist maize bollworms.

Q. Which is correct regarding the modification of leaves for the resistance to cold and dry conditions in conifers?

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(a) stems, roots and flowers
(b) stems, roots and leaves
(c) stems, flowers and fruits
(d) stems, leaves and flowers

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