Explanation

• Platelets, also called thrombocytes.
• They are blood cells that play a vital role in blood clotting.
• When a blood vessel is injured, platelets aggregate to form a plug that stops the bleeding.

Explanation

• A group of similar cells that perform a specific function combine to form tissue.
• Tissues then combine to form organs.
• Organs work together to form systems.

Explanation

• Rana tigrina, also known as the Asian giant toad or the Indian bullfrog.
• It is a species of frog found in Southeast Asia and the Indian subcontinent.

Explanation

Plasmodium is a genus of protozoan parasites that cause malaria.

There are several species of Plasmodium that can infect humans, including P. falciparum, P. vivax, P. ovale, and P. malariae.

Explanation

• Volvox is a genus of green algae that includes about 20 species of aquatic, photosynthetic organisms.
• They are characterized by their spherical or ellipsoidal shape and are typically found in freshwater environments.
• Volvox species are known for their unique colony structure, which consists of a hollow sphere of cells surrounding a central cavity.

Explanation

• In the human heart, blood returning from the lungs via the pulmonary veins drains into the left atrium.
• From there, it flows through the mitral valve into the left ventricle, which pumps it out to the rest of the body through the aorta.

Explanation

• Lysosome is the cell organelle found in animal cells that helps in intracellular digestion.
• It contains digestive enzymes and acids that break down cellular waste and foreign substances.

Explanation

• Paleontology is the scientific study of fossils and ancient life forms, focusing on the history of life on Earth, evolution, and extinction.
• Paleontologists use fossils to reconstruct the biology, ecology, and behavior of ancient organisms.

Explanation

The number of bioelements considered vital for life is 16. These essential elements include:

1. Carbon (C)
2. Hydrogen (H)
3. Oxygen (O)
4. Nitrogen (N)
5. Phosphorus (P)
6. Sulfur (S)
7. Potassium (K)
8. Calcium (Ca)
9. Magnesium (Mg)
10. Iron (Fe)
11. Sodium (Na)
12. Chlorine (Cl)
13. Copper (Cu)
14. Zinc (Zn)
15. Manganese (Mn)
16. Iodine (I)

Explanation

• Meiosis is a type of cell division that occurs in spore-producing organisms, such as plants and fungi, to produce spores.
• In meiosis, a diploid spore mother cell (sporocyte) undergoes two successive cell divisions (meiosis I and meiosis II) to produce four haploid spores.