11. Plants growing on marshy areas are commonly called as _____?
[A] Oxylophytes
[B] Lithophytes
[C] Helophytes
[D] Psilophytes
Show Answer
Correct Answer: C [Helophytes]
Notes:
Helophyte are those plants which are typical of marshy or lake-edge environments, in which the perennating organ lies in soil or mud below the water level, but the aerial shoots protrude above the water for air.
12. Hodophobia is the fear of which of the following?
[A] Sleeping
[B] Travel
[C] Drugs
[D] Cattle
Show Answer
Correct Answer: B [Travel]
Notes:
Hodophobia is the fear of travel. It is also referred to as travel phobia or fear of travel. Acute anxiety which is provoked by travel can be treated with anti-anxiety medication.
13. Which of the following organelle carries on the process of cell respiration?
[A] Mitochondria
[B] Endoplasmic reticulum
[C] Golgi body
[D] Lysosomes
Show Answer
Correct Answer: A [ Mitochondria]
Notes:
Mitochondrion carries on the process of cell respiration converting glucose to ATP energy the cell can use. An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner part being folded inwards to form layers.
14. With respect to the cultivation of Tea, the withering process is used to __?
[A] To stop the tea leaf oxidation at a desired level
[B] To remove excess water from leaves and allows slight oxidation
[C] To alter the flavour of the tea
[D] To stop browning of tea
Show Answer
Correct Answer: B [To remove excess water from leaves and allows slight oxidation]
Notes:
Withering is used to remove excess water from the leaves and allows a very slight amount of oxidation. The process is also important in promoting the breakdown of leaf proteins into free amino acids and increase the availability of freed caffeine, both which change the taste of the tea.
15. Which of the following is a fibrous protein?
[A] Enzymes
[B] Keratin
[C] Haemoglobin
[D] Albumin
Show Answer
Correct Answer: B [Keratin]
Notes:
Keratin is a group of fibrous proteins occurring in hair, feathers, hooves, and horns. Keratins have coiled polypeptide chains that combine to form supercoils of several polypeptides linked by disulphide bonds between adjacent cysteine amino acids.
16. In a majority of flowering plants, out of the four megaspores, what is the ratio of functional and degenerate megaspores?
[A] 2:2
[B] 1:3
[C] 4:1
[D] 3:1
Show Answer
Correct Answer: B [1:3]
Notes:
At least one of the spores develop into haploid female gametophytes thus making the ratio of functional and degenerate megaspores is 1:3. Out of the four, three megaspores degenrate.
17. What is caused by the deficiency of Vitamin D?
[A] Rickets
[B] Night blindness
[C] Pellagra
[D] Scurvy
Show Answer
Correct Answer: A [Rickets]
Notes:
Rickets is a skeletal disorder that’s caused by a lack of vitamin D, calcium, or phosphate. These nutrients are important for the development of strong, healthy bones. People with rickets may have weak and soft bones, stunted growth, and, in severe cases, skeletal deformities.
18. When compared to the mammals, birds are less sensitive to temporary deprivation of water, because?
[A] The water requirement per unit weight is less in birds than in mammals.
[B] Absorption of water from the gut is more efficient in birds than in mammals.
[C] Urea excretion in mammals entails a greater loss of water than that in birds.
[D] None of these
Show Answer
Correct Answer: A [The water requirement per unit weight is less in birds than in mammals.]
Notes:
When compared to the mammals, birds are less sensitive to temporary deprivation of water, because the water requirement per unit weight is less in birds than in mammals.
19. Match List I with List II and select the correct answer using the codes given below the lists.
|
List I
|
List II
|
|
A. Islets of Langerhans
|
1. Calcitonin
|
|
B. Pituitary gland
|
2. Epinephrine
|
|
C. Thyroid gland
|
3. Growth hormone
|
|
D. Adrenal gland
|
4. Insulin
|
Codes:
A B C D
[A] 4 3 2 1
[B] 4 3 1 2
[C] 3 4 1 2
[D] 3 2 4 1
Show Answer
Correct Answer: B [4 3 1 2]
Notes:
• The islets of Langerhans are a cluster of cells within the pancreas that are responsible for the production and release of hormones that regulate glucose levels.
• Growth hormone is also called somatotropin or human growth hormone, peptide hormone. It is secreted by the anterior lobe of the pituitary gland. It stimulates the growth of essentially all tissues of the body, including bone.
• Calcitonin is a hormone that is produced in humans by the parafollicular cells of the thyroid gland. Calcitonin is involved in helping to regulate levels of calcium and phosphate in the blood, opposing the action of parathyroid hormone.
• Hormones secreted by the adrenal medulla are Epinephrine. Most people know epinephrine by its other name—adrenaline. This hormone rapidly responds to stress by increasing your heart rate and rushing blood to the muscles and brain.
20. Which branch of biology is known for the study of fruits?
[A] Pomology
[B] Agronomy
[C] Floriculture
[D] None of these
Show Answer
Correct Answer: A [Pomology]
Notes:
Pomology is a branch of botany that studies fruit and its cultivation.