Myelin sheath is produced by:

1. Astrocytes and Schwann cells

2. Oligodendrocytes and Osteoclasts

3. Osteoclasts and Astrocytes

4. Schwann cells and Oligodendrocytes

Subtopic:  Neuroanatomy |
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Attractants and rewards are required for:

1. Entomophily

2. Hydrophily

3. Cleistogamy

4. Anemophily

Subtopic:  Pollination & Outbreeding Devices |
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Receptor sites for neurotransmitters are present on:

1. Pre-synaptic membrane

2. Tips of axons

3. Post-synaptic membrane

4. Membrane of synaptic vesicles

Subtopic:  Synapse |
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Coconut fruit is a:

1. Berry

2. Nut

3. Capsule

4. Drupe

Subtopic:  Fruits & their Types |
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Adult human RBCs are enucleated. Which of the following statement(s) is/ are the most appropriate explanation for this feature? 
(a) They do not need to reproduce 
(b) They are somatic cells 
(c) They do not metabolize 
(d) All their internal space is available for oxygen transport
1. Only (a)
2. (a),(c) and (d)
3. (b) and (c)
4. Only (d)

Subtopic:  Blood: General Description & RBC: Part 1 | Blood: General Description & RBC |
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Capacitation occurs in:

1. Epididymis

2. Vas deference

3. Female reproductive tract

4. Rete testis

Subtopic:  Fertilization: Part 1 | Fertilization |
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Asymptote in a logistic growth curve is obtained when:

1. K=N

2. K>N

3. K<N

4. The value of 'r' approaches zero

Subtopic:  Population: Logistic Growth Model |
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Artificial selection to obtain cows yielding higher milk output represents:

1. Directional, as it pushes the mean of the character in one direction

2. Disruptive, as it splits the population into two, one yielding output and the other lower output

3. Stabilizing followed by disruptive, as it stabilizes the population to produce higher yielding cows

4. Stabilizing selection, as it stabilizes this character in the population

Subtopic:  Types of Natural Selection |
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Select the mismatch:

1. Rhodospirillum - Mycorrhiza

2. Anabaena - Nitrogen fixer

3. Rhizobium - Alfalfa

4. Frankia - Alnus

Subtopic:  Nitrogen Fixation |
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Good vision depends on adequate intake of carotene rich food. 
Select the best option from the following statements: 
(i) Vitamin A derivatives are formed from carotene 
(ii) The photopigments are embedded in the membrane discs of the inner segment 
(iii) Retinal is a derivative of Vitamin A 
(iv) Retinal is a light absorbing part of all the visual photopigments

1. (i),(iii) and (iv)

2. (i) and (iii)

3. (ii), (iii) and (iv)

4. (i) and (iv)

Subtopic:  Human Eye: Adaptation |
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