11. In human body, the regulation of RBC production is accomplished by a harmone which is secreted by __:
[A] Liver
[B] Bone marrow
[C] Kidney
[D] Pancreas
Show Answer
Correct Answer: C [ Kidney]
Notes:
The regulation of RBC production is accomplished by the Erythropoietin hormone secreted by the kidneys.
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. Which part of the plant gives us saffron?
[A] Petals
[B] Stigma
[C] Roots
[D] Stem
Show Answer
Correct Answer: B [Stigma]
Notes:
The dried stigmas (thread-like parts of the flower) are used to make saffron spice. It can take 75,000 saffron blossoms to produce a single pound of saffron spice. Saffron is largely cultivated and harvested by hand.
14. Which among the following is responsible for the red colour of blood?
[A] Haemoglobin
[B] Platelets
[C] Plasma
[D] None of the above
Show Answer
Correct Answer: A [Haemoglobin]
Notes:
Haemoglogin pigment is responsible for the red colour of the blood. Haemoglobin is responsible for carrying oxygen from lungs to the tissues of the body.
15. Which of the following vitamins was discovered by Sir Edward Mellanby?
[A] Vitamin C
[B] Vitamin D
[C] Vitamin K
[D] Vitamin E
Show Answer
Correct Answer: B [Vitamin D]
Notes:
Vitamin D was discovered by Sir Edward Mellanby.
16. Francis Galton is related to which of the following science?
[A] Eugenics
[B] Microbiology
[C] Bryology
[D] Ecology
Show Answer
Correct Answer: A [Eugenics]
Notes:
Francis Galton is related to Eugenics. Galton defined eugenics as “the study of all agencies under human control which can improve or impair the racial quality of future generations”.
17. Which of the following cell organelles does not contain DNA?
[A] Nucleus
[B] Mitochondria
[C] Lysosomes
[D] Chloroplast
Show Answer
Correct Answer: C [Lysosomes]
Notes:
Lysosomes and vacuoles do not contain DNA. Mitochondria and chloroplasts have their own DNA.
18. Which of the following is involved in the synthesis of phospholipids?
[A] Mitochondria
[B] Cytoplasm
[C] Endoplasmic Reticulum
[D] Smooth Endoplasmic Reticulum
Show Answer
Correct Answer: D [Smooth Endoplasmic Reticulum]
Notes:
The smooth endoplasmic reticulum serves as part of many metabolic processes. It synthesizes lipids, phospholipids on the plasma membrane and steroids.
19. Zygotic meiosis is characterized by__?
[A]
Fucus
[B] Funaria
[C] Marchantia
[D] Chlamydomonas
Show Answer
Correct Answer: D [Chlamydomonas]
Notes:
Chlamydomonas is a genus of green algae that includes about 150 species. All these unicellular flagellates are found as “snow algae” in stagnant water and on moist soil, in freshwater, seawater and even ice. A zygotic meiosis is the meiosis of a zygote immediately following the karyotype, which is the fusion of two cell nuclei.
20. A single polar flagellum is known as__?
[A] monotrichous
[B] lophotrichous
[C] amphitrichous
[D] none of these
Show Answer
Correct Answer: A [monotrichous]
Notes:
Monotrichous bacteria have a single flagellum. Lophotrichous bacteria have multiple flagella located at the same location on bacterial surfaces that work together to steer the bacteria in the same direction.
