31. The increase in shoot and root length is called which of the following?
[A] Primary growth
[B] Secondary growth
[C] Little growth
[D] None of these
Show Answer
Correct Answer: A [Primary growth]
Notes:
The increase in the length of shoot and root is called primary growth. This shoot is the result of cell division in the apical meristem.
32. Which of the following shows double fertilization?
[A] Gymnosperms
[B] Angiosperms
[C] Algae
[D] All of the above
Show Answer
Correct Answer: B [Angiosperms]
Notes:
Angiosperms show double fertilization. Angiosperms are plants that produce flowers and bear their seeds in fruits.
33. A structure in the plant’s male reproductive organ where the development of pollen takes place is called__.
[A] Microsporangium
[B] Somatic hybridization
[C] Sporulation
[D] Apomixis
Show Answer
Correct Answer: A [Microsporangium]
Notes:
A structure in the plant’s male reproductive organ where the development of pollen takes place is called Microsporangium. It is surrounded by four layers: Epidermis, Endothecium, Middle layers, Tapetum.
34. The region where the leaves arise is__.
[A] internodes
[B] buds
[C] nodes
[D] stomata
Show Answer
Correct Answer: C [nodes]
Notes:
The region where the leaves arise is nodes and the region between the nodes is known as the internode.
35. What are the functions of connective tissue?
1. Insulating
2. Helps in binding the organs together and provides support
3. Helps in the constriction of organs and blood vessels
4. Provides shape to the body, conserves body heat, and also stores energy
Select the codes above:
[A] Only 1 and 2
[B] Only 2 and 3
[C] Only 1, 2 and 4
[D] 1, 2, 3 and 4
Show Answer
Correct Answer: C [Only 1, 2 and 4]
Notes:
The important and major functions of connective tissue in the body are: to insulate, Helps to connect and support the organs, protects against the invasion of pathogens by their phagocytic activity, Provides shape to the body, conserves body heat, and also stores energy, It is involved in the transport of water, nutrients, minerals, hormones, gases, wastes, and other substances within the body.
36. Which of the following is a feature of adipose tissue?
[A] present in skin and organs
[B] provides insulation due to the fat present
[C] Both 1 and 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: C [Both 1 and 2]
Notes:
Adipose tissue is present in skin and organs, composed of fat globules, and is characterized by fat storage and provides insulation due to the fat present.
37. Syphilis is a bacterial infection usually spread by __
[A] Sexual contact
[B] Wound infection
[C] Air-borne droplets
[D] None of these
Show Answer
Correct Answer: A [Sexual contact]
Notes:
Syphilis is a bacterial infection mostly spread by sexual contact. It is caused by Treponema pallidum bacteria.
38. Filariasis is also known as elephantiasis because?
[A] disease Spreads through Elephants
[B] excessive enlargement of teeth
[C] excessive enlargement of legs
[D] the patient starts looking like an elephant
Show Answer
Correct Answer: C [excessive enlargement of legs]
Notes:
Filariasis is also known as elephantiasis because of excessive enlargement of the legs.
39. A nitrogen-fixing bacterium that forms loose associations with the roots of crop plants is __.
[A] Azotobacter
[B] Bacillus polymyxa
[C] Clostridium
[D] Azospirillum
Show Answer
Correct Answer: D [Azospirillum]
Notes:
A nitrogen-fixing bacterium that forms loose associations with the roots of crop plants is Azospirillum.
40. Which of the following is an important objective of biotechnology in the field of agriculture?
[A] to decrease seed number
[B] to produce pest-resistant varieties of plants
[C] to increase phosphorous, nitrogen production
[D] to reduce the number of plants
Show Answer
Correct Answer: B [to produce pest-resistant varieties of plants]
Notes:
An important objective of biotechnology in the field of agriculture is to produce pest-resistant varieties of plants.
