51.

Match List I with List II:

List I (Molecule): (a) Proteins, (b) Carbohydrates, (c) Nucleic acid, (d) Lipids

List II (Product of digestion): (1) Nitrogenous bases and pentose sugars, (2) Fatty acids and glycerol, (3) Monosaccharides, (4) Amino acids

• (a) - 2, (b) - 3, (c) - 1, (d) - 4

• (a) - 2, (b) - 1, (c) - 3, (d) - 4

• (a) - 4, (b) - 1, (c) - 3, (d) - 2

• (a) - 4, (b) - 3, (c) - 1, (d) - 2

The genetic material of bacteria is found in:

• nucleus

• cytoplasm

• cell membrane

• ribosome

A horse and a donkey can breed to produce mule which is an infertile animal. The infertility is because horse and donkey belong to different:

• class

• order

• species

• genus

A plant having yellow leaves with dead spots has the deficiency of:

• Potassium

• Magnesium

• Nitrate

• Phosphate

Fluoride toothpaste is sometimes recommended because fluoride:

• prevents plaque formation

• hardens the enamel of the tooth

• kills pathogenic bacteria

• prevents tooth ache

Consider the following statements about cactus:

1. The leaves are reduced to spines.
2. The stem does the photosynthesis.

Which of the statements given above is/are correct?

• 1 only

• 2 only

• Both 1 and 2

• Neither 1 nor 2

In which one of the following, methanogens, i.e., methane producing bacteria are not present?

• Rumen of cattle

• Aerobic environment

• Anaerobic sludge

• Excreta of cattle

Malarial parasite is a:

• bacteria

• protozoa

• virus

• fungus

With reference to biodiversity, which ofthe following statements is/are correct?

1. Species richness and high degree of endemism are important criteria for identifying biodiversity hot spots.
2. Species diversity is highest in the tropics and decreases down the poles.
3. Biodiversity coriservation may be in situ as well as ex situ

Select the correct answer using the code given below:

• 1 only

• 2 and 3 only

• 1 , 2 and 3

• 1 and 3 only

It is difficult to kill viruses because they:

• consist of tough protein coat

• are very small in size

• lack cellular structure

• spend a lot of time inside the host's cells