11. Which of the following is the characteristic of water present in coconut?
[A] liquid endocarp
[B] liquid nucellus
[C] liquid mesocarp
[D] degenerated liquid endosperm
Show Answer
Correct Answer: D [degenerated liquid endosperm]
Notes:
The coconut water from tender coconut that we are familiar with, is nothing but free nuclear endosperm (made up of thousands of nuclei) and the surrounding white kernel is the cellular endosperm. In the most common types of endosperm development, the Primary Endosperm Nucleus (PEN) undergoes successive.
12. Who among the following analysed the DNA for the first time ?
[A] Watson and Krick
[B] Karl von Frisch
[C] M. W. Nirenberg
[D] Hargobind Khurana
Show Answer
Correct Answer: A [Watson and Krick]
Notes:
The discovery in 1953 of the double helix, the twisted-ladder structure of deoxyribonucleic acid (DNA), by James Watson and Francis Crick marked a milestone in the history of science and gave rise to modern molecular biology, which is largely concerned with understanding how genes control the chemical processes.
13. Which among the following is not a connective tissue?
[A] Blood
[B] Skin
[C] Cartilage
[D] Bone
Show Answer
Correct Answer: B [Skin]
Notes:
The connective tissues include several types of fibrous tissue that vary only in their density and cellularity, as well as the more specialized and recognizable variants—bone, ligaments, tendons, cartilage, and adipose tissue. Skin is not a connective tissue. It is the body’s largest organ and consists of multiple layers, including the epidermis (outermost layer) and the dermis (deeper layer). Skin primarily serves as a protective barrier and regulates temperature, but it is mainly classified as an epithelial tissue due to its structure and function.
14. Which of the following is the best reason behind the fact that bats can fly in the dark?
[A] Bats have a better vision in the dark
[B] The light startles them
[C] Bats produce high pitched sounds ultrasonic
[D] None of the above
Show Answer
Correct Answer: C [Bats produce high pitched sounds ultrasonic]
Notes:
The sounds that bats make are so high pitched that humans cannot hear them. High pitched sounds like this are called ultrasound. So, bats make high pitched squeaks while they fly. The echoes travel back to the bat and it can then tell how far away the objects are.
Bats use echoes or reflected sounds to determine the surrounding situation and to locate their prey. Often we see the bats fly at night. They fly in the dark so quickly without hitting anything. This process is called echolocation.
15. What is the meaning of the term ‘Test Tube Baby’?
[A] Fertilisation of ovum takes place in the test tube but it develops in uterus
[B] Fertilisation of ovum takes place in the test tube and develops in the test tube itself
[C] Fertilisation of the ovum takes place in the uterus but develops in the test tube
[D] Fertilisation takes place in uterus and embryo develops in uterus
Show Answer
Correct Answer: A [Fertilisation of ovum takes place in the test tube but it develops in uterus]
Notes:
Test tube baby is a term that refers to a child that is conceived outside the women’s body by a scientific process known as In-Vitro fertilization or IVF treatment. This entire process is done in a laboratory. In this process the eggs are taken from the mother’s ovary and fertilised by the sperms from the father.
Then the fertilized eggs are cultured for two to six days and allowed to be divided two to four times inside a test tube, thus the name test tube baby. These eggs are then implanted back into the uterus of a mother where it can develop normally. This is done with the sole intention for establishing and ensuring a successful pregnancy.
16. Poliomyelitis is an epidemic virus infection. Which of the following is responsible for it?
[A] Rhabdo virus
[B] Entero virus
[C] Dengue virus
[D] Mumps virus
Show Answer
Correct Answer: B [Entero virus]
Notes:
Poliovirus is known as the prototypical enterovirus. It can cause a subclinical or mild illness, aseptic meningitis, or paralytic poliomyelitis. It is a disease that has been eradicated in the United States and other developed countries. Coxsackie virus infection is the most common cause of viral heart disease.
17. 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.
18. Which pigment is responsible for the colour of healthy skin in human beings?
[A] Bilirubin
[B] Haemoglobin
[C] Melanin
[D] Progesterone
Show Answer
Correct Answer: C [Melanin]
Notes:
The single most factor responsible for the cpolour of the skin is the pigment melanin. It is secreted by the melanocytes within the skin.
19. Which of the following is studied in Ethnobotany?
[A] Practical use of plants by local culture and people
[B] Relations between Plants and peoples Behvaior
[C] Comparison of different plants in a particular area
[D] Study of relations of plants, animals and animals in an area
Show Answer
Correct Answer: A [Practical use of plants by local culture and people]
Notes:
Ethnobotany is the study of the plants of an area and their practical uses through the traditional knowledge of a local culture and people.
20. Who among the following is considered to be the father of DNA?
[A] James Watson
[B] Hargobind Khurana
[C] Alec Jeffereys
[D] Leslie Orgel
Show Answer
Correct Answer: A [James Watson]
Notes:
James Dewey Watson is an American molecular biologist, geneticist, and zoologist. In 1953, he co-authored with Francis Crick the academic paper proposing the double helix structure of the DNA molecule.