1. Which of the following statements is incorrect about the Lysosome?
[A] It is a membrane-bound organelle found in plant as well as animal cells
[B] It is also called the suicidal bag of the cell
[C] It helps in the synthesis of protein
[D] It acts as a dispatch station of protein products received from the endoplasmic reticulum (ER)
Show Answer
Correct Answer: D [It acts as a dispatch station of protein products received from the endoplasmic reticulum (ER)]
Notes:
Golgi apparatus acts as a dispatch station of protein products received from the endoplasmic reticulum (ER). Lysosomes are membrane-bound organelles. They are also called suicide bags because in case of disturbance of their cellular metabolism they digest their own cell by releasing own enzymes. Though lysosomes are not commonly-found in plant cells, but some plant cells do contain lysosomes.
2. Nephron is the basic structural and functional unit of which among the following organs?
[A] Nervous System
[B] Liver
[C] Pancreas
[D] Kidney
Show Answer
Correct Answer: D [Kidney]
Notes:
Nephrons are the basic structural and functional units of the kidneys. Each human kidney contains about 1,200,000 nephrons. Nephrons are made up of a renal corpuscle and a renal tubule. The renal corpuscle is the initial filtering component, and the renal tubule processes and carries away the filtered fluid.
Nephrons regulate water and soluble substances in the blood by filtering the blood, reabsorbing what is needed, and excreting the rest as urine. This function is vital for homeostasis of blood volume, blood pressure, and plasma osmolarity.
3. Which among the following plant hormone plays most important role in establishing dormancy in seeds?
[A] Ethylene
[B] Gibberellic acid
[C] Abscisic Acid
[D] Auxin
Show Answer
Correct Answer: C [Abscisic Acid]
Notes:
Abscisic Acid plays the most important role in establishing dormancy in seeds. Abscisic Acid has also been found to be present in metazoans, from sponges up to mammals including humans.
4. Which of the following bacteria forms an endosymbiotic nitrogen fixing association with roots of legumes that helps in Nitrogen Fixation?
[A] Clostridium
[B] Rhizobium
[C] Salmonella
[D] Staphylococcus
Show Answer
Correct Answer: B [Rhizobium]
Notes:
Rhizobium Found in roots of legumes, like Peas, grams, Pulses etc, where it fixes atmospheric nitrogen as ammonia, which is then converted into useful amino acid.
5. The Chlorophyll cells within the plant leaves are perfectly optimized to absorb which of the following waves of the Sun Light?
[A] Green
[B] Red & Blue
[C] Red & Yellow
[D] Yellow and Blue
Show Answer
Correct Answer: B [Red & Blue]
Notes:
The Chlorophyll cells within the plant leaves are perfectly optimized to absorb red and blue waves of the Sun Light. Chlorophyll is concentrated within organisms in structures called chloroplasts.
6. Which among the following live tissues of the Human Eye does not have blood vessels?
[A] Sclera
[B] Cornea
[C] Choroid
[D] Iris
Show Answer
Correct Answer: B [Cornea]
Notes:
Cornea does not have blood vessels. It is the transparent part of the eye that covers the front portion of the eye. It covers the pupil, iris, and anterior chamber.
7. Which one of the following is a useful functional association between fungi and the roots of higher plants?
[A] Mycorrhyza
[B] Lichen
[C] Root Nodules
[D] Cluster roots
Show Answer
Correct Answer: A [ Mycorrhyza]
Notes:
A Mycorrhyza is a composite organism consisting of a fungus (the mycobiont) and a photosynthetic partner (the photobiont or phycobiont) growing together in a symbiotic relationship.
8. Which of the following diseases is spread by mosquitoes but is not a viral disease?
[A] Meningitis
[B] Dengue fever
[C] Yellow fever
[D] Filariasis
Show Answer
Correct Answer: D [ Filariasis]
Notes:
Filariasis is a parasitic disease caused by an infection with roundworms of the Filarioidea type. These are spread by blood-feeding black flies and mosquitoes. Meningitis is an inflammation of the protective membranes covering the brain and spinal cord known as the meninges. The inflammation may be caused by infection with viruses, bacteria or other microorganisms. Yellow fever is an acute viral disease. It is caused by the yellow fever virus and is spread by the bite of an infected female mosquito.
9. Which of the following is the name given to the population of cells derived from a single parent cell?
[A] Haploid
[B] Diploid
[C] Symmetrical cell
[D] Clone
Show Answer
Correct Answer: D [Clone]
Notes:
Under suitable conditions, a single cell grows into a colony of cells on agar medium. The resulting population of genetically identical cells derived from a single parent cell is called a clone.
10. How many bones are present in healthy adult human being?
[A] 205
[B] 207
[C] 206
[D] 208
Show Answer
Correct Answer: C [206]
Notes:
An adult human skeleton comprises of 206 bones which is greater than the number of bones present at birth. This is due to the fusing of bones as one grows up. The bone density in the human body reaches maximum at the age of 21.
