Which of the following group of words can be correctly identified with Rhizobium?

• Roots of legumes, parasite, soluble nitrogen compounds

• Leguminous plants, symbiotic, stem nodes

• Root nodules, pitcher plant, nitrogen deficient soil
  
  

• Nitrogen fixation, root nodules, leguminous plants

12.

Which vitamin protects our eyes and skin from infection?

• Vitamin C

• Vitamin B

• Vitamin A

• Vitamin D

Match List I with List-II and select the correct answer using the codes given below the lists.

Two organisms are best friends and live together. One provides shelter, water and nutrients while the other prepares and provides food. Such an association of organisms is termed as

• autotrophy

• parasitism

• heterotrophy

• symbiosis

Select from the following a set of Kharif crops.

• Cotton, paddy, pea, linseed

• Paddy, maize, cotton, soyabean

• Gram, mustard, groundnut, wheat

• Maize, paddy, linseed, soyabean

Study the following statements about the effects of weeds on the crop plants
A. They help crop plants to grow healthily.
B. They interfere in harvesting.
C. They affect plant growth.
D. They compete with crop plants for water, nutrients, space, and light.

The correct statements are

• C and D

• Only D

• B, C, and D

• A, B and D

Given below are the steps to test the presence of proteins in a food item. These steps are not incorrect sequence.

A. Take a small quantity of food item in a test tube add 10 drops of water to it and shake it.
B. Make the paste or powder of the food to be tested.
C. Add 10 drops of caustic soda solution to the test tube and shake well.
D. Add 2 drops of copper sulphate to it.

The correct sequence of these steps is

• A, B, D, C

• B, A, D, C

• B, A, C, D

• D, B, A, C

If we add a handful of garden soil to a beaker filled three-quarters with water, stir the contents with a stick to dissolve the soil and then let it stand undisturbed for some time, we observe different layers. The order of these layers from the bottom to the top is

• gravel, clay, sand, humus, water

• sand, gravel, clay, water, humus

• clay, sand, gravel, humus, water

• gravel, sand, clay, water, humus

Cereals such as wheat and gram are grown in an area. The soil of this area must be

• loamy and sandy

• clayey

• sandy and clayey

• clayey and loamy

A person is suffering from a disease named 'Goitre'. Which of the following glands of the person is not functioning properly?

• Adrenal

• Pancreas

• Pituitary

• Thyroid