Moss peat is used as a packing material for sending flowers and live plants to distant places because:
1. it is easily available
2. it is hygroscopic
3. it reduces transpiration
4. it serves as a disinfectant
A common structural feature of vessel elements and sieve tube elements is:
1. thick secondary walls
2. pores on lateral walls
3. presence of P-protein
4. enucleate condition
The thalloid body of a slime mould (Myxomycetes) is known as:
1. protonema
2. Plasmodium
3. fruiting body
4. mycelium
In which mode of inheritance do you expect more maternal influence among the offspring?
1. Autosomal
2. Cytoplasmic
3. Y-linked
4. X-linked
What type of placentation is seen in sweet pea?
1. Basal
2. Axile
3. Free-central
4. Marginal
Long filamentous threads protruding at the end of a young cob of maize are:
1. | anthers | 2. | styles |
3. | ovaries | 4. | hairs |
Conifers differ from grasses in the:
1. production of seeds from ovules
2. lack of xylem tracheids
3. absence of pollen tubes
4. formation of endosperm before fertilization
How many different kinds of gametes will be produced by a plant having the genotype AABbCC?
1. Three
2. Four
3. Nine
4. Two
In maize, hybrid vigour is exploited by:
1. bombarding the protoplast with DNA
2. crossing of two inbred parental lines
3. harvesting seeds from the most productive plants
4. inducing mutations
Which of the following statements regarding mitochondrial membrane is not correct?
1. | The outer membrane is permeable to all kinds of molecules |
2. | The enzymes of the electron transfer chain are embedded in the outer membrane |
3. | The inner membrane is highly convoluted forming a series of infoldings |
4. | The outer membrane resembles a sieve |