11. Gram Positive Bacteria can be identified by the Gram staining because of the following reasons?
[A] The cell walls have more lipids compared to peptidoglycan
[B] The Cells walls have more Peptidoglycan compared to Lipids
[C] The Cells membrane has more fatty acids
[D] The plasma has Peptidoglycans
Show Answer
Correct Answer: B [ The Cells walls have more Peptidoglycan compared to Lipids]
Notes:
The cell wall which is made up of Peptidoglycan as well as lipids gets violet due to the reaction of the CV+. After the decolorization with alcohol, the lipids gets dissolved and the bacteria with higher Peptidoglycan remain violet. These are called Gram Positive bacteria.
12. ‘Dendrochronology’ is the study of the age of which of the following?
[A] Woody Plants
[B] Shrubs
[C] Fungi
[D] All of the above
Show Answer
Correct Answer: A [Woody Plants]
Notes:
Dendrochronology is the branch of biology which studies and estimates the age of woody plants.
13. What is an another name for blood cancer?
[A] Leukemia
[B] Carcinoma
[C] Sarcoma
[D] Melanoma
Show Answer
Correct Answer: A [Leukemia]
Notes:
Leukemia, a type of cancer found in your blood and bone marrow. It is caused by the rapid production of abnormal white blood cells. The high number of abnormal white blood cells are not able to fight infection, and they impair the ability of the bone marrow to produce red blood cells and platelets.
14. Which plants grow under water stress conditions of deserts?
[A] Epiphytes
[B] Xerophytes
[C] Sciophytes
[D] Heliophytes
Show Answer
Correct Answer: B [Xerophytes]
Notes:
A Xerophyte is a species of plant that has adapted to survive in an environment with little liquid water, such as a desert or an ice- or snow-covered region in the Alps or the Arctic.
15. Which of the following is an example of Symbiotic bacteria?
[A] Rhizobium
[B] Protozoa
[C] Flat worms
[D] None of the above
Show Answer
Correct Answer: A [Rhizobium]
Notes:
Rhizobium is a kind of symbiotic bacteria. Many legumes have root nodules that provide a home for symbiotic nitrogen-fixing bacteria called rhizobia. This relationship is particularly common in nitrogen-limited conditions. The Rhizobia convert nitrogen gas from the atmosphere into ammonia.
16. Which among the following is an autotroph?
[A] Honey bee
[B] Algae
[C] Grasshopper
[D] Butterfly
Show Answer
Correct Answer: B [Algae]
Notes:
Autotrophs are the organisms which are able to prepare their own food without depending on other organism. Auto means self and prophs means food. All the organisms which are capable of carrying photosynthesis are examples of autotrophs.
17. Which among the following is the smallest endocrine gland in the human body?
[A] Pineal gland
[B] Pancreas
[C] Hypothalamus
[D] Liver
Show Answer
Correct Answer: A [Pineal gland]
Notes:
Pineal gland which is located in brain’s midline is the smallest of all the endocrine glands. Melatonin harmone is secreted by the pineal gland.
18. Who among the following has defined race in population concept?
[A] Montagu
[B] Dobzhansky
[C] Templeton
[D] Hooton
Show Answer
Correct Answer: B [Dobzhansky]
Notes:
Race refers to classification of humans into relatively large and distinct population groups based on appearance through heritable phenotypic characteristics, often influenced by and correlated with culture, ethnicity and socio-economic status.
Dobzhansky (1970) has defined race in population concept as “Race are genetically distinct Mendelian populations. They are neither individuals nor particular genotypes; they consist of individuals who differ genetically among themselves.”
19. Which of the following person related to the invention of DDT?
[A] Paul Muller
[B] Roe Berth
[C] Frances Kelsey
[D] Jack Horner
Show Answer
Correct Answer: A [Paul Muller]
Notes:
DDT was first synthesized in 1874 by Austrian chemist Othmar Zidler. The insecticidal action of DDT was discovered in 1939 by the Swiss chemist Paul Hermann Müller.
20. Which of the following minerals is related to cytochromes?
[A] Cu and Fe
[B] Cu
[C] Mg
[D] Fe
Show Answer
Correct Answer: A [Cu and Fe]
Notes:
The minerals associated with cytochromes are Fe and Cu.
