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8751.

Question : What are capnophilic bacteria?

Answer»

SOLUTION :BACTERIA which require `CO_2` for their GROWTH are CALLED as capnophilic bacteria. Example : Campylobacter.
Discussion
8752.

Question : What are bulliform cells ? How it helps the plants ?

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Solution :In leaves, some cells of upper EPIDERMIS (Example : Grasses) are larger and THIN walled. They are CALLED BULLIFORM cells or MOTOR cells. These cells are helpful for the rolling and unrolling of the leaf according to the weather change.
Discussion
8753.

Question : What are canals of Volkmann?

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SOLUTION :The HORIZONTAL canals in the LONG bones that CONNECT various Haversia
Discussion
8754.

Question : What are Brunner's glands ? What is their function?

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Solution :They are PRESENT mainly in the SUBMUCOSA of DUODENUM and secrete an alkaliane MUCUS.
Discussion
8755.

Question : What are brood bodies?

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Solution :Brood bodies are the small detachable BRANCHES which help in VEGETATIVE PROPAGATION. e.g., Bryopteris fruticulosa.
Discussion
8756.

Question : What are bronchi ? Where are they present?

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SOLUTION :TRACHEA divides into TWO bronchi before the LUNGS.(left and right bronchi). Right BRONCHUS enters the right lung and divides further and left bronchus enters the left lung and divides further.
Discussion
8757.

Question : What are Bone cells ? Give an example.

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Solution :Rod dhaped SCLEREIDS with dilated ENDS are called bone cells or Osteosclereids
EXAMPLE : Seed coat of Pisum.
Discussion
8758.

Question : What are biomacromolecules ?

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SOLUTION :REFER POINT of REMEMBER.
Discussion
8759.

Question : What are biological indicators of soil fertility?

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Solution :1. Earthworms are also CALLED as "biological indicators of SOIL FERTILITY".
2. The reason is that they support bacteria, fungi, PROTOZOANS and a host of other organisms which are essential for sustaining a healthy soil.
Discussion
8760.

Question : Explain Bast fibres?

Answer»

SOLUTION :Bast FIBRES or Extra Xylary Fibres : These fibres are present in the phloem. Natural Bast fibres are strong and cellulosic Fibres obtainning from the phloem or outer bark of jute, KENAF, flax and hemp plants. They so - CALLED pericyclic fibres are actually phloem fibres
Discussion
8761.

Question : What are bicollateral vascular bundles?

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SOLUTION :Cambium and PHLOEM OCCUR twice. Xylem forms the MIDDLE RING.
Discussion
8762.

Question : What are bead like structures called?

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SOLUTION :RIBOSOMES.
Discussion
8763.

Question : What are axial parenchyma & Ray parenchyma ?

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Solution :Parenchyma arranged logitudinally ALONG the log AXIS is called axial parenchyma. RAY parenchyma is arranged in radial ROWS.
Discussion
8764.

Question :What are auxospores ?

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Solution : These are rejuvenile CELLS of diatoms which HELP in increasing their size to NORMAL.
Discussion
8765.

Question : What are atavistic organs ?

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Solution :Sudden APPEARANCE of vestigial organs in highly evolved organisms is CALLED ATAVISTIC organs. Eg: PRESENCE of tail in a human baby is an atavistic ORGAN.
Discussion
8766.

Question : What are Archaebacteria?

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SOLUTION :Archaebacteria are primitive PROKARYOTES and are adapted to thrive in extreme environments like hot SPRINGS, high salinity and low PH. E.g. Thermoplasma.
Discussion
8767.

Question : What are 'aquaporins' ? How does presence of aquaporins affect osmosis?

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Solution :Aquaporins are proteins available in cell membrane. They make either a hole/aperture or pathway. Water can be moved faster by these holes than normal osmosis.
This is a plumbing method of CELLS that transports water either inside the cell or OUTSIDE the cell SELECTIVELY WHITE lon pathway or soluble substances obstruct them.
Discussion
8768.

Question : What are APC ?

Answer»

SOLUTION :1. Anaphase -PROMOTING complex cyclosome (APC/C) is a ubiquitine ligase.
2. It is a cluster of proteins that INDUCES breaking down of cohesion protenins THUS facilitating the separation of chromatids during mitosis.
Discussion
8769.

Question : What are aplanospores ?

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SOLUTION :They are THIN WALLED NON motile spores produced during asexual reproduction in algae. Eg: Vaucheria.
Discussion
8770.

Question : What are annual rings ?

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Solution :Annual rings. The ACTIVITY of the cambium varies due to the seasonal changes. During favourableconditions i.e. spring the cambium produces the secondary xylem (wood) and is CALLED the spring wood. In the autumn the activity of cambium is LESS and produces wood of smaller DIAMETER and is called autumn wood. These LAYERS layers form the rings of secondary xylem. These are the growth rings. The growth rings of spring wood and autumn wood constitutethe annual ring.
Discussion
8771.

Question : Whatare antennamoleculesin photosnthesis ?

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SOLUTION :Antennamolecules are lightharvestingmolecules thatoccuron theoutersideofphotosyntheticunit .
Discussion
8772.

Question : What are Angiosperms ?

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Solution :Angiosperms are seed PLANTS having xylem TISSUES containing VESSELS and the seeds within CLOSED carpels.
Discussion
8773.

Question : What are angiospermic plants ?

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Solution :The PLANTS in which the ovules or POTENTIAL seeds are ENCLOSED within a HOLLOW OVARY are called angiospermic plants.
Discussion
8774.

Question : What are allosteric inhibitors?

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Solution :Compounds which MODIFY enzyme activity by causing a reversible change in the structure of the enzyme active SITE. This in turn affects the ABILITY of the substrate to bind to the enzyme. Such compounds are CALLED allosteric inhibitors. E.g. the enzyme hexokinase which catalysis glucose to glucose-6 phosphate in GLYCOLYSIS isinhibited by glucose-6 phosphate. this is an example for feedback allosteric inhibitor.
Discussion
8775.

Question : What are Ammonotelic animals?

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SOLUTION :Animals that EXCRETE ammonia with excess of water are CALLED ammonoteles. e.g., fishes, aquatic amphibians and aquatic insects.
Discussion
8776.

Question : What are akinetes?

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Solution :Thick walled SPORES MEANT for PERENNATION and GERMINATE during favourable conditions seen in ALGAE .Eg: Pithophora.
Discussion
8777.

Question : What are adventitious roots ?

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SOLUTION :Roots developing from any PART of the plant other than RADICLE is CALLED ADVENTITIOUS roots.
Discussion
8778.

Question : What are adventitious buds ? Give an example.

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Solution :Buds arising at any part other than stem are KNOWN as ADVENTITIOUS BUD. e.g., BEGONIA.
Discussion
8779.

Question : What are actual remains ?

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SOLUTION :The original hard parts such as bones, TEETH or SHELLS are preserved as such in the earth.s atmosphere. This is the most COMMON method of fossilization.
Discussion
8780.

Question : What are Actinomycetes? Give example.

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SOLUTION :1. Actinomycetes or 'Ray fungi' are anaerobic or facultative anaerobic microorganisms.
2. They show mycelia LIKE growth.
3. EG : Streptomyces.
Discussion
8781.

Question : What are 3 types of mycorrhiza ?

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SOLUTION :ECTOMYCORRHIZA, ENDOMYCORRHIZA and Ectendomycorrhiza.
Discussion
8782.

Question : What anatomical structure will you use to distinguish between old dicot stem and old dicot root ?

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SECONDARY phloem
Protoxylem
Cortical cells
Secondary xylem

Answer :B
Discussion
8783.

Question : What are acoelomates?

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Solution :The animals which do not POSSESS a body cavity are called ACOELOMATES. The body is SOLID without perivisceral cavity. These have restricted free movement of internal organs. e.g. FLATWORMS.
Discussion
8784.

Question : What aids the action of capillary plants?

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SOLUTION :SMALL DIAMETER of TRACHEIDS and VESSELS.
Discussion
8785.

Question : Whar do you understand by Centrarch Xylem ?

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Solution :Protoxylem is located in the centre SURROUNDED by the metaxylem is called Centrarch. In this TYPE only one vascular strand is DEVELOPED. EXAMPLE : SELAGINELLA sp.
Discussion
8786.

Question : Whale, Peacock, Bat, Earthworm, Starfish, House lizard, scropion, Lizard. In the animal : (I) which one is different in symmetry and what is its symmetry? (ii) Which animals belongs to some class and phylum? (iii) Which animalshave three ear ossicles. Give sequence of sound conduction in them. (iv) Which animals belongs to same phylum? (v) Which two animals are poisonous? Give their class an phylum.

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SOLUTION :(i) Starfish adult has pentamerous radial symmetry while rest are billaterlly SYMMETRICAL. (ii) Whale and bat belong to class mammalia and phylum. Chordata. (III) Whale and bat have three OSSICLES. The sequence of sound wave conduction isMalleusIncusStapes. (iv) Whale, bat, House lizard, Peacock belongs to phylum Chordata. Honey bee and scorpion belong to phylum ARTHROPODA. (v) Lizard (Phylum - Chordata, Class - Reptilia) Scorpion (Phylum - Chordata, Class - Archnida).
Discussion
8787.

Question : Whales have no limbs bats have wings , yet both of them are included in Mammalia . The reason is , they have

Answer»

seven cervival VERTEBRAE
12 pairs of cranial NERVES
MAMMARY glands
all of these

Answer :D
Discussion
8788.

Question : Whale is the largest known fish.

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ANSWER :FALSE
Discussion
8789.

Question : Welwitschia has reproductive structure in its juvenile stage .

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ANSWER :F
Discussion
8790.

Question : Wedge shaped modified branches developed by Sphacelaria are called as ………………….. .

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BUDS
AKINETES
TUBERS
BULBILS

ANSWER :D
Discussion
8791.

Question : We see colour with the help of _______cells while vision in dim light depends on __________cells of the retina.

Answer»


ANSWER :CONES ; RODS
Discussion
8792.

Question : We refer to the following as the food chain

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Large NUMBER of human BEINGS forming a human chain NEAR a SOURCE of food
Large number of animals near a source of food
Transfer of food energy from the GREEN plants through a series consumed by organisms
None of these

Answer :C
Discussion
8793.

Question : We know that plants require nutrients ,If we supply these in excess, will it be beneficial to the plants? IF yes how/If no why?

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Solution :Each plant has requirement of micronutrients in very less low amount.While their moderate decrease CAUSES the deficiency symptoms and a moderate increase causes toxicity. The dry weight of 10% minerals is considered toxic. The concentration for trace elements is different as per plants eg. `Mn^(+2)` SHOW more toxicity than `600 mu gg^-1.5300 mu gg^-1` become toxic for soyabean and Sunflower.
The toxicity symptoms are difficult to identify because absorption of one material removes effect of other element.
E.g the prominent symptom of manganese toxicity is the appearance of brown SPOTS surrounded by chlorotic veins.
Because (i) absorption of `Fe^(+3) and Mg^(+2)` is decreased.
(ii) `Mg^(+2)` decreases activity of particular enzyme.
(iii) Prevents translocation of `Ca^(+2)` towards shoot tip.
This way, excess of `Mn^(+2) ` induce deficiencies of iron, magnesium and calcium.
Discussion
8794.

Question : We know that plants are harmed by excess water. But plants survive under flooded condition. How are they able to manage excess water ?

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SOLUTION :Plants can remove excess water by doing more TRANSPIRATION till some limit. If plant ROOTS remain in water for longer TIME then plant DIES.
Discussion
8795.

Question : We have seen that capillary walls are not permeable to plasma proteins. Suggest where the protein comes from

Answer»

SOLUTION :The PLASMA PROTEINS are SYNTHESIZED in the LIVER.
Discussion
8796.

Question : We find that Rhizobium forms nodules on the roots of leguminous plants. Also Frankia anothermicrobe forms nitrogen fixing nodules on the roots of non-leguminous plant Alnus. (a) can we artifically induce the property of nitrogen fixation in a plant, leguminous or non leguminous (b) What kind of relationship is observed between mycorrhiza and pine trees? (c ) Is it necessary for a microbe to be in close association with a plant to provide mineral nutrition. Explain with the help of one example.

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Solution :(a) Scientist adopted ARTIFICIAL methods in LEGUMINOUS and non leguminous but their rate is very low because genetic behaviour PLAYS a definite role in this process.
(b) Pine and MYCORRHIZA both are symbiotic. Both are beneficiary to each other.
( c) There should be close relation between micro organism and plants eg. Rhizobium enters into root and associates with root tissue, at that time only it can help in nitrogen FIXATION.
Discussion
8797.

Question : We commonly call ATP as the energycurrencyof the cell. Can you think of some otherenergycarriers presentin a cell ? Nameany two .

Answer»

Solution :Energycarriers are such definite moleculesthatconvertsenergyand accepts energyand stores thatenergy which is necessary forchemicalprocesses.
THREE mainenergy CARRIERS are there : ATP, NADH and NADH
Discussion
8798.

Question : We can not breath for few seconds after taking a long and deep breath (A) There is much CO_(2) in blood so (B) There is much O_(2) in blood so (C) There is less CO_(2) in blood so (D) There is loss O_(2) in blood so

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There is much `CO_(2)` in blood so
There is much `O_(2)` in blood so
There is LESS `CO_(2)` in blood so
There is LOSS `O_(2)` in blood so

ANSWER :C
Discussion
8799.

Question : We are using perfume to our body. Write the name of the plant and their product.

Answer»

SOLUTION :NAME of the perfume yielding PLANT - Santalum album. Product - Sandal OIL.
Discussion
8800.

Question : Wax gland present in the ear canal is called

Answer»

sweat gland
prostate gland
cowper's gland
sebaceous gland / CERUMINOUS gland

Solution :Ear CANAL is lined by hairy skin and ceruminous glands (wax glands).These glands SECRETE a waxy substance cerumen (ear wax) which PREVENTS the FOREIGN bodies entering the ear.
Discussion