Questions
Girdling of a tree involves the removal of
- xylem
- phloem
- xylem and phloem
- vascular cambium
Unipolar neurons are present in
- dorsal root ganglia of spinal cord
- retina of eye
- olfactory epithelium
- grey matter of brain
Which of the following is true about the myelinated nerve fibres?
- They appear grey in colour.
- They occur in autonomic nerves.
- They give off collateral nerve fibres.
- They carry nerve impulse slowly.
Which of the following is not the feature of the dendrites of neurons?
- They are usually numerous per neuron.
- They contain neurofibrils and Nissl's granules.
- They have terminal branches with synaptic knobs.
- They carry impulse towards the cyton.
Which of the following types of epithellium is present in parotid salivary gland?
- Simple cuboidal ciliated epithelium
- Simple columnar ciliated epithelium
- Pseudostratified columnar epithelium
- Pseudostratified ciliated columnar epithelium
Which of the following are the complex polymers of amino acids?
- Proteins
- Carbohydrates
- Fats
- Vitamins
Penicillin is extracted from
- Penicillium camemberti
- Penicillium notatum
- Penicillium candidum
- Penicillium expansum
Which plant hormone is responsible for promoting cell division?
- Gibberellin
- Auxin
- Cytokinin
- Abscisic acid
The Avery-Macleod-McCarty experiment demonstrated that
- RNA is involved in transduction in bacteria
- DNA is involved in transduction in bacteria
- DNA causes transformation in bacteria
- RNA causes transformation in bacteria
Which of the following statements is true about cilia and microvilli?
- Microvilli arise from basal granule.
- Cilia are longer and thinner than microvilli.
- Both cilia and microvilli are covered by coat of glycocalyx.
- Cilia are usually cylindrical in shape.
Which of the following mineral nutrients helps in the oxidation of carbohydrates in energy metabolism?
- Calcium
- Iodine
- Iron
- Phosphorous
Resting spore of many fungi which survive in unfavourable conditions is called
- sporangium
- chlamydospore
- sporangiophore
- synangium
Cavities formed in plant cells by autolysis of glandular cells are called
- schizogenous cavities
- lysigenous cavities
- schizolysigenous cavities
- intercellular spaces
The scientific name of bread mould is
- Rhizopus artocarpi
- Rhizopus oligiosporus
- Rhizopus nigricans
- Rhizopus oryzae
According to the chemical structure of DNA, a base linked to a sugar is called
- nucleotide
- nucleoside
- polynucleotide
- base pair
Responses to stimuli by plants in the night is called
- thermonasty
- chemonasty
- thigmonasty
- nyctinasty
Which division of fungi does penicillium belong to
- basidiomycota
- zygomycota
- ascomycota
- deuteromycotina
Which vitamin plays an important role in health and development of the vision?
- Vitamin A
- Vitamin D
- Vitamin C
- Vitamin E
Where does stomata occur in a dorsi-ventral leaf?
- Upper epidermis
- Lower epidermis
- Both upper and lower epidermis
- Mesophyll layer
Retting of fibres is performed by
- Pseudomonas florescence
- Bacillus megatherium
- Lactobacillus delbreuckii
- Beggiatoa
The microscopic channels of cell walls through which transport of materials occurs in plant cells are called
- gap junctions
- membrane nanotubes
- plasmodesmata
- stromules
Which of the following is required for the normal growth, development and maintenance of good health?
- Vitamin A
- Haemoglobin
- Calcium
- Fats
Which of the following is not true about red algae?
- They belong to division rhodophyta.
- They are highly poisonous if consumed in any form.
- Phycobiliproteins give them their red colour.
- They have high vitamin and protein content.
Which of the following is the correct feature of keratinised epithelium in contrast to non- keratinised epithelium?
- It forms the lining of buccal cavity, pharynx and oesophagus.
- Its surface cells are living and contain cytoplasm.
- It forms the layer impervious to water.
- It is not protected against abrasion.
Which of the following pairs of vitamins are fat-soluble?
- A and D
- B and C
- A and C
- A and B