601. Ginger is a stem and not a root because –

1. It stores food material
2. It grows horizontally in the soil
3. It has nodes and internodes
4. All of the above

Option “4” is correct.
Ginger is a modified plant stem and it is not a root. Because it stores food material, grows horizontally in soil ,It has nodes and inter-nodes.
602. Which of the following elements is obtained from the sea algae?

1. Argon
2. Sulphur
3. Vanadium
4. Iodine

Option “4” is correct.
Iodine is obtained from algae.
603. In which part of the cinchona plant quinine occurs naturally?

1. Root
2. Fruit
3. Seed
4. Bark

Option “4” is correct.
Quinine is a major drug used to treat malaria. Quinine is extracted from the bark of Cinchona tree.
604. After bringing out of water fishes die because-

1. They get excess quantity of oxygen
2. Their body temperature increases
3. They cannot breathe
4. They cannot move in water

Option “3” is correct.
Fish use gills to breath and gills can only bring in oxygen when moist. Out of water, a fish’s gills dries out and then the fish dies.
605. The unit of heredity in our body is called-

1. Chromosome
2. DNA
3. Gene
4. Nucleus

Option “3” is correct.
A gene is the basic physical and functional unit of heredity.
606. The number of bones in adult human body is –

1. 206
2. 300
3. 320
4. 180

Option “1” is correct.
The skeleton of an adult human body consist of 206 bones.
607. Mammoth is the Ancestor of-

1. Dog
2. Horse
3. Camel
4. Elephant

Option “4” is correct.
Extinct mammoth is more closely related to today’s African elephant or Asian elephant. Modern elephants and wooly mammoths share a common ancestor, that lived about 7 million years ago.
608. What is the name of a group of similar cells performing a specific function?

1. Tissue
2. Organ
3. Organ system
4. Cellular organization

Option “1” is correct.
A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.
609. Plant tissues are of how many types?

1. 3
2. 2
3. 5
4. 6

Option “1” is correct.
Plant tissues are categorized broadly into three tissue systems: the epidermis, the ground tissue, and the vascular tissue.
610. Red rot is a disease caused to which of the following plant?

1. Paddy
2. Sugarcane
3. Mustard
4. Wheat

Option “2” is correct.
Red rot is a disease caused to Sugarcane. Red rot is one of the major constraints in the profitable cultivation of sugarcane in many states of India. It is caused by the fungus Glomerella tucumanensis.
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