31. A method for the delivery of nucleic acids to cells by high-speed particle bombardment is called?
[A] Transformation
[B] Biolistics
Biolistics
[C] Sequencing
[D] None of these
Show Answer
Correct Answer: B [Biolistics
Biolistics]
Notes:
A method for the delivery of nucleic acids to cells by high-speed particle bombardment is called Biolistics.
32. What is the basis of classifying various plant tissues as meristematic tissue and permanent tissue?
[A] Size
[B] Dividing capacity
[C] Location
[D] None of the above
Show Answer
Correct Answer: B [Dividing capacity]
Notes:
Based on the dividing capacity of the tissues, various plant tissues can be classified as growing or meristematic tissue and permanent tissue. Meristem is a type of tissue system in plants, composed of a mass of undifferentiated cells and their primary function is to take part in the growth of plants. Permanent tissues are differentiated tissues doing specific functions such as conduction, providing mechanical support or carrying out photosynthesis etc.
33. Wisdom teeth is the ____:
[A] 1st molar teeth
[B] 2nd molar teeth
[C] 3rd molar teeth
[D] 4th molar teeth
Show Answer
Correct Answer: C [3rd molar teeth]
Notes:
A wisdom tooth, in humans, is any of the usual four third molars. Wisdom teeth usually appear between the ages of 16 and 25. They are generally thought to be called wisdom teeth because they appear so late – much later than the other teeth, at an age where people are presumably “wiser” than as a child, when the other teeth erupt.
34. Pulses are obtained from the family of ____:
[A] Liliaceae
[B] Fungi
[C] Cycadaceae
[D] Leguminosae
Show Answer
Correct Answer: D [Leguminosae]
Notes:
Pulse, in botany, is a common name for members of the Fabaceae (Leguminosae), a large plant family. Pulses, high in protein, are used as food for humans and other animals. Besides, they play a key role in crop rotation due to their ability to fix nitrogen.
35. Which of the following multiplies very slowly in comparison to others?
[A] Bacteria
[B] Fungi
[C] Virus
[D] Worms
Show Answer
Correct Answer: D [Worms]
Notes:
Viruses, bacteria and fungi multiply very quickly, while worms multiply very slowly in comparison. Taxonomically, all bacteria are closely related to each other than to viruses and vice versa.
36. Which muscles in the skin contract to make the hairs on our skin stand up straight (goose bumps) when we are cold or frightened?
[A] Epidermis
[B] Collagen
[C] Elastin
[D] Arrector pili
Show Answer
Correct Answer: D [Arrector pili]
Notes:
Arrector pili is a microscopic band of muscle tissue which connects a hair follicle to the dermis. ? When stimulated, the arrector pili will contract and cause the hair to become more perpendicular to the skin surface (stand on end), known colloquially as goose bumps.
37. Which of the following is a vestigial organ in human body?
[A] Spleen
[B] Thyroid
[C] Gall bladder
[D] Wisdom teeth
Show Answer
Correct Answer: D [Wisdom teeth]
Notes:
Evolutionary biologists now classify wisdom teeth as vestigial organs, or body parts that have become functionless due to evolution. They believe wisdom teeth, or the third set of molars, were the evolutionary answer to our ancestor’s early diet of rough food – like leaves, roots, nuts and meats – which required more chewing power and resulted in excessive wear of the teeth. The modern diet with its softer foods has made the need for wisdom teeth nonexistent.
38. Brain receives and sends signals in the form of ____:
[A] Electrical impulses
[B] Magnetic impulses
[C] Mechanical impulses
[D] Chemical impulses
Show Answer
Correct Answer: A [Electrical impulses]
Notes:
The human brain sends messages to other parts of the body through a network of connecting wires (neurons) called the nervous system. Neurons carry messages in the form of electrical signals called nerve impulses. The human brain contains about 100 billion neurons.
39. Which of the following is an example of parasitic algae?
[A] Ulothrix
[B] Cephaleuros
[C] Oedogonium
[D] Sargassum
Show Answer
Correct Answer: B [Cephaleuros]
Notes:
Cephaleuros is a genus of parasitic thalloid algae comprising approximately 14 species. Its common name is red rust. The alga is parasitic on tea, coffee, mango and guava causing damage limited to the area of algal growth on leaves.
40. Conglobate gland is a leaf like structure found in ____:
[A] Male Ascaris
[B] Male Cockroach
[C] Female Cockroach
[D] Female Ascaris
Show Answer
Correct Answer: B [Male Cockroach]
Notes:
Conglobate gland is a leaf like, median, unbranched gland of male cockroach. It lies below the ejaculatory duct and open into the genital pouch close to the male genital aperture.