Option “1” is correct Thyroxine harmone can increase the heartbeat, it’s principal function is to stimulate the consumption of oxygen and thus the metabolism of all cells and tissues in the body.
452. The study of relation of animals and plants to their surroundings is called__________
1. Ecology
2. Ethrology
3. Genealogy
4. Iconology
Option “1” is correct Ecology is the study of the relationships between plants, animals, people, and their environment, and the balances between these relationships.
453. At which stage in its life cycle does the silkworm yield the fiber of commercial use-
1. Larva
2. Egg
3. Pupa
4. Imago
Option “1” is correct The silkworm is the larva or caterpillar or imago of the domestic silkmoth, Bombyx mori. It is an economically important insect, being a primary producer of silk.
454. Which one of the following events in a botanical garden is never directly influenced by light?
Option “4” is correct Fertilization is the fusion of haploid gametes, egg and sperm, to form the diploid zygote. Sunlight has no direct relation with Fertilization.
455. Which of the following is a fish?
1. Jelly fish
2. Lobster
3. Salmon
4. Whale
Option “3” is correct Salmon is the common name for several species of ray-finned fish in the family Salmonidae.
456. Which is used as an Air pollution indicator?
1. Algae
2. Fungi
3. Bacteria
4. Lichens
Option “4” is correct
Lichens are widely used as environmental indicators or bio-indicators. Because of their sensitivity lichens are particularly significant biological indicators of air pollution.
Option “1” is correct A legume is a plant or its fruit or seed in the family Fabaceae. Legumes are grown agriculturally, primarily for their grain seed called pulse, for livestock forage and silage, and as soil-enhancing green manure. Many legumes have root nodules that provide a home for symbiotic nitrogen-fixing bacteria called rhizobia.
459. Earthworms belongs to the phylum –
1. Protozoa
2. Cnidaria
3. Annelida
4. Mollusca
Option “3” is correct Earthworms belongs to the Annelida Phylum.
460. Ringworm is a disease caused by –
1. Fungi
2. Bacteria
3. Virus
4. Flies
Option “1” is correct
Ringworm of the skin (tinea corporis) is most commonly caused by the fungus Trichophyton rubrum, which spreads from one person to another
