501. Dinosaurs were in-

1. Paleozoic era
2. Cenozoic era
3. Mesozoic era
4. Pleistocene era

Option “3” is correct
Dinosaurs lived between 230 and 65 million year ago, in a time known as Mesozoic Era.
502. The red colour of the red sea is due to the presence of :

1. Moss
2. Bacteria
3. Algae
4. Fungi

Option “3” is correct
The Red Sea is a seawater inlet of the Indian Ocean, lying between Africa and Asia. An algae, of phylum Cyanobacteria called Trichodesmium erythraeum is present in this sea. It contains abundant quantities of pigments, phycobilin, phycoerythrin and phycocyanin, due to which the sea appears red or pinkish.
503. Plants adapted to dry climate are known as-

1. Epiphyte
2. Xerophyte
3. Hydrophytes
4. Mean plants

Option “2” is correct
A xerophyte is a species of plant that has adapted to survive in a dry environment.
504. Which one of the following is not a plant hormone?

1. Cytokinin
2. Ethylene
3. Insulin
4. Gibberellin

Option “3” is correct
A hormone produced in the pancreas by islets of Langerhans, which regulates the amount of glucose in the blood. The lack of insulin causes diabetes.
505. Plants which grow on saline soils are-

1. Xerophytes
2. Hydrophytes
3. Halophytes
4. Succulents

Option “3” is correct
Hydrophytes or aquatic plants are plants that have adapted to live in an aquatic environment (saltwater or freshwater). They are also referred as macrophytes. These plants require special adaptations for living submerged in water or at the water’s surface. Plants growing on saline soils or water are called halophytes.
506. Fish generally breathe through-

1. Skin
2. Nose
3. Gills
4. Fins

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.
507. The sugar present in DNA is :

1. Glucose
2. Fructose
3. Deoxyribose
4. None of these

Option “3” is correct
The deoxyribose is sugar found in DNA. It is a variant of five carbon sugar called ribose. The DNA is an informational molecule found mainly in the nucleus of the cell.
508. Delonix regia Rafin is the scientific name of –

1. Banyan
2. Gulmohar
3. Tamarind
4. Chiku

Option “2” is correct
Delonix regia Rafin is the scientific name of Gulmohar.
509. Amoeba belongs to the phylum –

1. Protozoa
2. Annelida
3. Porifera
4. Platyhelminthes

Option “1” is correct
Amoeba is a genus that belongs to protozoa, which are unicellular eukaryotes organisms with membrane-bound cell organelles.
510. Other name of Platelets is?

1. Leucocytes
2. Erythrocytes
3. Lymphocytes
4. Thrombocytes

Option “4” is correct
Platelets, also called thrombocytes are a component of blood whose function (along with the coagulation factors) is to stop bleeding by clumping and clotting blood vessel injuries.
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