31. What is the shape of the stomach?
[A] J – shaped
[B] S – shaped
[C] O – shaped
[D] None of these
Show Answer
Correct Answer: A [J – shaped]
Notes:
The stomach is a J-shaped organ and is present on the left side of the abdomen.
32. Which of these statements is not true regarding the function of hormones?
[A] Reproduction and sexual differentiation
[B] Maintenance of internal environment
[C] Maintain body temperature
[D] Development and growth
Show Answer
Correct Answer: C [Maintain body temperature]
Notes:
Hormones are released by specialized cells of the endocrine glands and act on distant target cells. One hormone can contribute to many functions and sometimes several hormones can perform the same function.
33. The outermost layer of the ovary is made up of ___.
[A] simple cuboidal cells
[B] stereocilia
[C] stroma
[D] cilia
Show Answer
Correct Answer: A [simple cuboidal cells]
Notes:
Ovarian or germinal epithelium is the outermost layer of the ovary composed of simple cuboidal cells. It is actually a modified visceral peritoneum.
34. In which of the following the ovarian medulla contains many round or oval bodies?
[A] corpus luteum
[B] ovarian follicles
[C] corpus Albicans
[D] antrum
Show Answer
Correct Answer: B [ovarian follicles]
Notes:
In ovarian follicles, the ovarian medulla contains many round or oval bodies.
35. Who proposed the modern synthetic theory of organic evolution?
[A] R.A. Fisher
[B] T. Dobzhansky
[C] Julian Huxley
[D] Ernst Mayr
Show Answer
Correct Answer: C [Julian Huxley]
Notes:
Julian Huxley proposed the modern synthetic theory of organic evolution.
36. Azolla enriches rice fields with nitrogen due to its association with?
[A] Anabaena
[B] Nostoc
[C] Rhizobium
[D] Frankia
Show Answer
Correct Answer: A [Anabaena]
Notes:
Azolla enriches rice fields with nitrogen due to its association with Anabaena.
37. Carbon monoxide poisoning can be cured by
____:
[A] Drinking lemon-water
[B] Eating butter
[C] Exposing the affected person to fresh oxygen
[D] Consuming multi-vitamin tablet
Show Answer
Correct Answer: C [Exposing the affected person to fresh oxygen]
Notes:
Carbon monoxide poisoning can be cured by exposing the affected person to fresh oxygen. It is because CO posoning leads to oxygen starvation of body cells. This therapy involves breathing pure oxygen in a chamber in which the air pressure is about two to three times higher than normal. This speeds the replacement of carbon monoxide with oxygen in your blood. Hyperbaric oxygen therapy may be used in cases of severe carbon monoxide poisoning.
38. Azolla increases soil fertility for ____:
[A] Wheat cultivation
[B] Rice cultivation
[C] Maize cultivation
[D] Barley cultivation
Show Answer
Correct Answer: B [Rice cultivation]
Notes:
The nitrogen-fixing capability of Azolla an aquatic pteridophyte has led to it being widely used as a biofertiliser for increasing the productivity of rice fields. When rice paddies are flooded in the spring, they can be inoculated with Azolla, which then quickly multiplies to cover the water, suppressing weeds. The rotting plant material releases nitrogen to the rice plants, increasing the rice yield equivalent to that produced by 30-60 kg N/ha.
39. Tendons and ligaments are
____:
[A] Connective tissue
[B] Muscular tissue
[C] Epithelial tissue
[D] Skeletal tissue
Show Answer
Correct Answer: A [Connective tissue]
Notes:
A tendon is a fibrous connective tissue which attaches muscle to bone. A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.
40. The cells of sclerenchyma tissue have their walls thickened due to which chemical substance?
[A] Cellulose
[B] Hemicellulose
[C] Lignin
[D] Pectin
Show Answer
Correct Answer: C [Lignin]
Notes:
Sclerenchyma cells are usually dead cells that have heavily thickened secondary walls containing lignin. The cells are rigid and non-stretchable and are usually found in non-growing regions of plant bodies, such as the bark or mature stems. Sclerenchyma is one of the three types of fundamental, tissue in plants; the other two types being Parenchyma and Collenchyma.
