21. Which of the following is a calyx?
[A] the second whorl of a flower
[B] the third whorl of the flower
[C] the outermost whorl of a flower
[D] None of these
Show Answer
Correct Answer: C [the outermost whorl of a flower]
Notes:
The calyx is the outermost whorl of a flower, consisting of sepals, small leaves present at the base of the flower. These protect the flowering clump against mechanical injury and drying. The calyx in some plants is colored sepals called petaloid.
22. The sequence of events, which is carried out from the time of pollen deposition over the stigma and till the entry of pollen tube inside the ovule is called__.
[A]
pollination
[B] fertilization
[C] pollen-pistil interaction
[D] all of these
Show Answer
Correct Answer: C [pollen-pistil interaction]
Notes:
The sequence of events, which is carried out from the time of pollen deposition over the stigma and till the entry of pollen tube inside the ovule is called pollen-pistil interaction.
23. What are the symptoms of the black arms in cotton?
[A] dark red to black lesions
[B] dark brown to black lesions
[C] dark green to black lesions
[D] None of these
Show Answer
Correct Answer: B [dark brown to black lesions]
Notes:
Black arm symptom is characterized by dark brown to black lesions that may occur simultaneously and extended necrosis then surrounds the stem with blockage of the vascular system at infected sites.
24. What are the features of Phylum Mollusca?
[A] Less segmented body
[B] Typically, open circulatory system
[C] Limbs are present
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Phylum Mollusca is a large group of animals. They have a bilaterally symmetrical and triploblastic, Less segmented body, well-developed organ and organ system, typically, open circulatory system and Limbs are present.
25. Flame cells are the excretory structures for__.
[A] Annelida
[B] Coelenterates
[C] Platyhelminthes
[D] Echinodermata
Show Answer
Correct Answer: C [Platyhelminthes]
Notes:
Flame cells are the excretory structures for Platyhelminthes. Platyhelminthes are best described as flatworms, triploblastic, acoelomate animals.
26. What type of reptiles are turtles?
[A] Viviparous
[B] Oviparous
[C] Bisexual
[D] Parthenogenic
Show Answer
Correct Answer: B [Oviparous]
Notes:
Oviparous animals are female animals that lay their eggs, with little or no other embryonic development within the mother. Turtles are Oviparous.
27. Bone marrow does not occur in __
[A]
Fishes
[B] Amphibians
[C] Birds
[D] Reptiles
Show Answer
Correct Answer: C [Birds]
Notes:
Bone marrow does not occur in birds because bone marrow is present in all animals which belong to the group of mammals. Birds have pneumatic bones that are hollow and devoid of bone marrow.
28. Which hormone enhances milk release from the mammary glands?
[A] Adrenocorticotrophic Hormone
[B] Pressor
[C] Prolactin
[D] Both 1 and 2
Show Answer
Correct Answer: C [Prolactin]
Notes:
The pituitary glands of animals such as cattle can be used for the extraction of hormones for medical purposes. Prolactin hormone enhances milk release from the mammary glands.
29. What is the function of a tendon?
[A] To link bones to bones
[B] To link muscles to bones
[C] To link muscles to ligaments
[D] To bind the cells in compact bone closer together
Show Answer
Correct Answer: B [To link muscles to bones]
Notes:
Tendons are strong and tough fibers. It connects muscles to bones. Muscles move bones by pulling on tendons. Tendons allow you to move the muscle to which it is attached. Tendons themselves do not stretch.
30. Neutrophils, basophils, lymphocytes, eosinophils, and monocytes are examples of __.
[A] Physical barrier
[B] Cellular barriers
[C] Cytokine barriers
[D] Physiological barriers
Show Answer
Correct Answer: B [Cellular barriers]
Notes:
Neutrophils, basophils, lymphocytes, eosinophils, and monocytes are examples of Cellular barriers.
