Passage cells are thin-walled cells found in:
| 1. | endodermis of roots facilitating rapid transport of water from cortex to pericycle |
| 2. | phloem elements that serve as entry points for substances for transport to other plant parts |
| 3. | testa of seeds to enable emergence of growing embryonic axis during seed germination |
| 4. | central region of style through which the pollen tube grows towards the ovary |
The opening of floral buds into flowers is a type of:
1. autonomic movement of locomotion
2. autonomic movement of variation
3. paratonic movement of growth
4. autonomic movement of growth
Telomere repetitive DNA sequences control the function of eukaryotic chromosomes because they:
1. act as replicons
2. are RNA transcription initiators
3. help chromosome pairing
4. prevent chromosome loss
Identify the odd combination of the habitat and the particular animal concerned.
1. Dachigam National Park-Snow Leopard
2. Sunderbans-Bengal Tiger
3. Periyar-Snow Leopard
4. Rann of Kutch-Wild Ass
In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of:
1. mesophyll
2. bundle sheath
3. phloem
4. epidermis
A human male produces sperms with the genotypes AB, Ab, aB and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?
1. AaBb
2. AaBB
3. AABb
4. AABB
Which of the following ecosystem types has the highest annual net primary productivity?
1. Tropical rainforest
2. Tropical deciduous forest
3. Temperate evergreen forest
4. Temperate deciduous forest
In human body, which one of the following is anatomically correct?
| 1. | Floating ribs-2 pairs | 2. | Collar bones-3 pairs |
| 3. | Salivary glands-1 pair | 4. | Cranial nerves-10 pairs |
Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?
1. Casuarina equisetifolia
2. Crotolaria juncea
3. Cycas revoluta
4. Cicer arietinum
The population of an insect species shows an explosive increase in numbers during the rainy season followed by its disappearance at the end of the season. What does this show?
| 1. | S-shaped or sigmoid growth of this insect |
| 2. | the food plants mature and die at the end of the rainy season |
| 3. | Its population growth curve is of J-type |
| 4. | The population of its predators increases enormously |
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