Question
Name any two forms of extinct reptiles that evolved from synapsids.
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Answer
Pelycosaurs and Therapsids.
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Similar questions
Arrange the following primates in correct sequence of evolution to man-
- Dryopithecus.
- Australopithecus.
- Homo erectus.
- Homo habilis.
- Homo sapiens.
- Cro-Magnon man.
- Ramapithecus.
The barriers in the innate immunity are given in the following table. Identify a, b, c and d.
|
S.No.
|
Type of Barrier
|
S.No.
|
Barrier
|
|
a.
|
Physical
|
i.
|
Skin, a
|
|
b.
|
Physiological
|
ii.
|
b, in the eye
|
|
c.
|
c
|
iii.
|
Interferon
|
|
d.
|
Cellular
|
iv.
|
WBC, d
|
Why do submerged plants receive weaker illumination than exposed floating plants in a lake?
Explain autoimmunity.
Refer to the following diagram of a strand of nucleotide to answer questions a-d.
- What molecule is represented by S?
- What molecule is represented by B?
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The following graph shows the species-area relationship. Answer the following questions as directed.
- Name the naturalist who studied the kind of relationship shown in the graph. Write the observations made by him.
- Write the situations as discovered by the ecologists when the value of Z (slope of the line) lies between (a) 0.1 and 0.2 (b) 0.6 and 1.2. What does Z stand for?
- When would the slope of the line 'B' become steeper?
Write the physiological reason, why a woman generally cannot conceive a child after 50 years of age.
Explain gene cloning.
With the help of one example, explain the phenomena of co-dominance and multiple allelism in human population.
What are the assumptions that led to the human genome project?