11. Which of the following glands control temperature in human beings?
[A] Pituitary gland
[B] Thyroid gland
[C] Hypothalamus gland
[D] Adrenal gland
Show Answer
Correct Answer: C [Hypothalamus gland]
Notes:
The hypothalamus in the brain controls body temperature by regulating heat production and loss:
Temperature comparison: The hypothalamus compares the body’s current temperature to the normal temperature of around 37°C.
Heat production: If the body is too cold, the hypothalamus triggers heat production.
Heat loss: If the body is too hot, the hypothalamus triggers heat loss, such as sweating or giving off heat.
12. It is possible to produce seedless tomato fruits by which of the following processes?
[A] Applying trace elements in tomato fields
[B] spraying mineral solution on plants
[C] spraying hormones on flowers
[D] applying fertilizers containing radioactive elements
Show Answer
Correct Answer: C [spraying hormones on flowers]
Notes:
Seed and fruit development are intimately related processes controlled by internal signals and environmental cues. One method to produce seedless fruit is to develop plants able to produce fruits independently from pollination and fertilization of the ovules.
13. What is a jelly-like substance found floating inside the plasma membrane called?
[A] Cell sap
[B] Cytoplasm
[C] Karyoplasm
[D] Mitochondria
Show Answer
Correct Answer: B [Cytoplasm]
Notes:
The jelly-like substance inside the plasma membrane in which all the organelles float is called cytoplasm.
14. What kind of sugar is present in sugarcane?
[A] Sucrose
[B] Hexose
[C] Glucose
[D] Ribose
Show Answer
Correct Answer: A [Sucrose]
Notes:
Sucrose is present in sugarcane. It is also known as cane sugar or table sugar. It is the combination of glucose and fructose.
15. The lysogenic state is controlled by the activity of the regulatory region of the lambda phage genome, this region is called?
[A] immunity repressor
[B] immunity operon
[C] operon repressor
[D] none of these
Show Answer
Correct Answer: B [immunity operon]
Notes:
The lysogenic state is controlled by the activity of the regulatory region of the lambda phage genome, this region is called immunity operon.
16. Which is not an exception in angiosperms?
[A] Double fertilization
[B] Secondary growth
[C] Presence of vessels
[D] Autotrophic nutrition
Show Answer
Correct Answer: A [Double fertilization]
Notes:
Angiosperms are plants that produce flowers. They hold their seeds in the fruits. They are the largest and most diverse group within the Plantae kingdom, with approximately 300,000 species. Double fertilization is a characteristic of angiosperms in which both a diploid zygote and a triploid endosperm are formed in this process of green fertilization.
17. Which was the first plant to live in the land?
[A] Angiosperms
[B] Bryophytes
[C] Gymnosperms
[D] Pteridophytes
Show Answer
Correct Answer: B [Bryophytes]
Notes:
Bryophytes was the first plant to live in the land. Bryophytes do not have vascular tissue. The plant body consists of structures such as root, stem and leaf.
18. Pyrenoids are the center of the formation of__?
[A] Enzymes
[B] Proteins
[C] Fats
[D] Starch
Show Answer
Correct Answer: D [Starch]
Notes:
Pyrenoids are the center of the formation of Starch. Pyrenoids are non-membrane-bound organelles found in the chloroplasts of algae and hornwort plants. It can be seen by light-microscopy.
19. What does Prothallus represent?
[A] sporophytic phase in a fern
[B] gametophytic phase in a fern
[C] sporophytic phase in a gymnosperm
[D] gametophytic phase in a gymnosperm
Show Answer
Correct Answer: B [gametophytic phase in a fern]
Notes:
Prothallus represents the gametophytic phase in a fern. The diploid sporophyte represents a major, independent, photosynthetic, and vascular plant body.
20. Which of the following is the smallest gymnosperm?
[A] Cycas
[B] Pinus
[C] Zamia
[D] Gnetum
Show Answer
Correct Answer: C [Zamia]
Notes:
The smallest gymnosperm is Zamia pygmia which reaches a height of 25 cm.
