481. Bamboo is classified as-

1. Tree
2. Grass
3. Shrub
4. Herb

Option “2” is correct
Bamboo is a type of Grass.
482. Which of the following helps us in protecting from infection?

1. R.B.C.
2. W.B.C.
3. Blood plasma
4. Hemoglobin

Option “2” is correct
White blood corpuscles (WBCs) are disease-fighting cells found in blood. When our blood in infected by any harmful bacteria or virus at any in the body, white bloods corpuscles reaches there and eats up or destroys these harmful outsiders.
483. Roundworm is a human parasite found in the –

1. Small intestine
2. Liver
3. Stomach
4. Kidney

Option “1” is correct
Roundworms, or nematodes, are a group of invertebrates (animals having no backbone) with long round bodies. With the exception of the parasitic roundworm that causes trichinosis, mature adult roundworms eventually end up or live in human small intestines and cause infection and disease.
484. Locked jaw disorder is the other name of the disease –

1. Tetanus
2. Muscular disorder
3. Typhoid
4. Filariasis

Option “1” is correct
Tetanus, commonly called locked jaw, is a bacterial disease that affects the nervous system.Locked jaw syndrome is a disorder that is related to our jaw joint. It causes severe pain and sometimes cannot open the mouth.
485. Which of the following is known a body builder?

1. Protein
2. Carbohydrates
3. Vitamins
4. Fats

Option “1” is correct
Proteins are large biological molecules consisting of one or more chains of amino acids, are essential nutrients for the human body. They are one of the building blocks of body tissue, and can also serve as a fuel source.
486. Haemoglobin contains the metal –

1. Copper
2. Molybdenum
3. Iron
4. Magnesium

Option “3” is correct
Hemoglobin is made up of globin proteins and an iron (metal) rich compound called heme found in RBC involved in transport of oxygen. Each heme group contains iron which is responsible for binding of oxygen.
487. The life span of RBC of man is –

1. 120 days
2. 150 days
3. 180 days
4. 190 days

Option “1” is correct
The life span of RBC of man is 120 days.
488. Cellulose is the chief constituent of –

1. Cell wall
2. Cell membrane
3. Secondary wall of xylem
4. Body wall of insects

Option “1” is correct

Cellulose is the substance that makes up most of a plant’s cell walls.
489. The set of unpaired Chromosomes are called –

1. Haploid
2. Diploid
3. Pyrimidine
4. Cytosine

Option “1” is correct

The set of unpaired Chromosomes are called Haploid.
490. Chromosomes found in cell which are responsible for characters other than sex are called –

1. Genome
2. Autosome
3. Plasmagen
4. Tonoplast

Option “2” is correct
Chromosomes found in cell which are responsible for characters other than sex are called Autosome.
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