In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to
graft rejection
auto-immune disease
active immunity
active immunity
B.
auto-immune disease
When the immune system cannot differentiate between self and non-self cells then the immune system attcks and destroys the self cells and this is called auto-immunity.
In a test cross involving F1 dihybrid flies, more parental-type offspring were produced that the recombinant type offspring. This indicates
chromosomes failed to separate during meiosis
the two genes are linked and present on the same chromosome
both of the characters are controlled by more than one gene
both of the characters are controlled by more than one gene
Seed formation without fertilisation in flowering plants involves the process of
budding
Somatic hybridisation
Apomixis
Apomixis
Name the chronic respiratory disorder caused by cigarette smoking
asthma
respiratoty disease
respiratory alkalosis
respiratory alkalosis
Match the terms in Column I with their description in Column II and choose the correct option.
| Column I | Column II |
| A. Dominance | 1. Many genes governs a single character |
| B. Codominance | 2. In a heterozygous organism, only one allele expresses itself |
| C. Pleiotropy | 3. In a heterozygous organism both alleles express themselves fully |
| D. Polygenic inheritance | 4. A single gene influences many characters |
| A | B | C | D |
| 2 | 3 | 4 | 1 |
| A | B | C | D |
| 4 | 1 | 2 | 3 |
| A | B | C | D |
| 4 | 3 | 1 | 2 |
| A | B | C | D |
| 4 | 3 | 1 | 2 |
Which of the following structures is homologous to the wing of a bird?
Wing of a moth
Hind limb of a rabbit
Flipper of whale
Flipper of whale
In a context of amniocentesis, which of the following statement is incorrect?
It is used for prenatal sex determination
It can be used for detection of down syndrome
It can be used for detection of cleft palate
It can be used for detection of cleft palate
Whic of the following statements is not correct?
Insects that consume pollen or nectar without bringing about pollination are called pollen nectar robbers
Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil
Some reptiles have also been reported as pollinators in some plant species
Some reptiles have also been reported as pollinators in some plant species
Which of the following approaches does not give the defined action of contraceptive?
| Intra-uterine devices | Increase phagocytosis of sperms, suppress sperm motility and fertilising capacity of sperms. |
| Hormonal contraceptives | Prevent/retard entry of sperms, prevent ovulation and fertilisation |
| Vasectomy | Prevents spermatogenesis |
| Vasectomy | Prevents spermatogenesis |
Antivenom injection contains preformed antibodies while polio drops that are administered into the body contain
harvested antibodies
gamma globulin
attenuated pathogens
attenuated pathogens
