Description : Which of the following statements is not true for stomatal apparatus? (a) Guard cells invariably possess chloroplasts and mitochondria. (b) Guard cells are always surrounded by subsidiary cells. (c) Stomata are involved in gaseous exchange. (d) Inner wall of guard cells are thick
Last Answer : (b) Guard cells are always surrounded by subsidiary cells.
Description : Root suckers are a) Insects that suck nutrients from the roots of plants b) Shoots that arise from roots to form new plant c)New plant parts that arise from the branches of fruit trees d) Roots of neighboring plants that share water with the another plant
Last Answer : b) Shoots that arise from roots to form new plant
Description : The special modified epiderniai cells surrounding stomatal pore are called - (1) Epithelial cells (2) Guard cells (3) Subsidiary cells (4) Accessory cells
Last Answer : (2) Guard cells Explanation: The pore is bordered by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the opening. Guard cells are specialized cells in the epidermis of leaves, stems and other organs that are used to control gas exchange.
Description : Specialised epidermal cells surrounding the guard cells are called (a) bulliform cells (b) lenticels (c) complementary cells (d) subsidiary cells
Last Answer : d) subsidiary cells.
Description : The special modified epidermal cells surrounding stomatal pore are called (1) Epithelial cells (2) Guard cells (3) Subsidiary cells (4) Accessory cells
Last Answer : Guard cells
Description : The cells which are closely associated and interacting with guard cells are - (1) Transfusion tissue (2) Complementary cells (3) Subsidiary cells (4) Hypodermal cells
Last Answer : (3) Subsidiary cells Explanation: Guard cells interact physiologically and mechanically with subsidiary cells. Guard cells are those which have chloroplasts and control the opening of stomata. But, subsidiary cells are those which support the guard cells and they do not have chloroplasts.
Description : The cells which are colsely associated and interacting with guard cells are (1) Transfusion tissue (2) Complementary cells (3) Subsidiary cells (4) Hypodermal cells
Last Answer : Subsidiary cells
Description : The exchange of gases takes place in the leaves through these pores for the purpose of photosynthesis. These pores are called – (1) Guard Cells (2) Stomata (3) Chloroplast (4) None of the above
Last Answer : (2) Stomata Explanation: Stomata are tiny pores present on the surface of the leaves via which exchange of gases takes place in the leaves for the purpose of photosynthesis. However, exchange of gases also occurs across the surface of stems, roots and leaves as well.
Description : (a) Draw a diagram to show open stomatal pore and label on it: (i) guard cells (ii) chloroplast (b) State two functions of stomata. (c) How do guard cells regulate the opening and closing of stomatal pore? -Biology
Last Answer : (a) (b) Two functions of stomata are: (i) Exchange of gases between the plant and the atmosphere takes place through stomata. (ii)Transpiration in plants takes place through stomata. ( ... through these stomata, the plant closes these pores when it does not require carbon dioxide for photosynthesis.
Description : What is the function of guard cells of stomata? -Science-7
Last Answer : Each stoma is surrounded by two guard cells. These guard cells control the opening and closing of stomata.
Description : What does the stomata open? (I) When the guard cells are in flaccid condition (ll) When there is an accumulation of K ions in the guard cells (III) When water enters into the guard cells (IV) When the water potential of ... of adjacent cells (A) II, III and IV I and IV (B) I and III (C) (D) None
Last Answer : (A) II, III and IV
Description : Stomata open and close due to (a) circadian rhythm (b) genetic clock (c) pressure of gases inside the leaves (d) turgor pressure of guard cells
Last Answer : (d) turgor pressure of guard cells.
Description : Opening and closing of stomata is due to the (a) hormonal change in guard cells (b) change in turgor pressure of guard cells (c) gaseous exchange (d) respiration.
Last Answer : (b) change in turgor pressure of guard cells
Description : What is stomata ?
Last Answer : There are many small holes on the surface of the leaves of the tree , these are called stomata.
Description : Stomata in bryophytes are present in the of: (a) Capsule (b) Leaf (c) Stem (d) Seta
Last Answer : Ans. ((a))
Description : In Caryophyllaceae the stomata are
Last Answer : In Caryophyllaceae the stomata are – Diacytic
Description : Classification of stomata was first given by
Last Answer : Classification of stomata was first given by – Metcalfe and Chalk (1950)
Description : Dumbell shaped stomata are found in
Last Answer : Dumbell shaped stomata are found in – Members of family Poaceae
Description : Stomata are absent in family
Last Answer : Stomata are absent in family – Balanophoraceae
Description : Given below is the diagram of a stomatal apparatus. In which of the following all the four parts labelled as A, B, C and D are correctly identified? A B C D A B C D ... ) Epidermal Guard cell Stomatal Subsidiary cell cell aperture (d) Epidermal Subsidiary Stomatal Guard cell cell cell aperture
Last Answer : d) Epidermal Subsidiary Stomatal Guard cell cell cell aperture
Description : For SR latch whent the out put is undesirable a) 0, 0 b) 1, 0 c) 0, 1 d) 1, 1
Last Answer : Ans: 1, 1
Description : In which stage of cell does crossing over occur? What is its role in the origin of species?
Last Answer : Ans: Pachytene of Meiosis. It brings about variations in the off spring. Continuation of these variations for several generations leads to origin of new species.
Description : Study of plant species in relation to its environmental history is called: a. Phylogeny b. Histology c. Ontogeny d. None of these
Last Answer : Histology
Description : A period in the ontogeny of crop at which maximum crop weed competition occurs is called a). Economic threshold b). Gain threshold c). Competitive threshold d). None
Last Answer : d). None
Description : A pheromone is A) an endorphin released within the anterior pituitary. B) a growth factor related to the production of tumors. C) a product of a neurosecretory cell that acts on ... ) a regulatory hormone that stimulates or inhibits the release of hormones produced by other endocrine glands.
Last Answer : D) a chemical released by one animal to affect the behavior of another animal.
Description : Odontokgy is the branch of science which deals with the study of – (1) Teeth (2) Ontogeny (3) Bone (4) Ageing
Last Answer : (1) Teeth Explanation: Scientific study of teeth is called dontology. '
Description : Odontology is the branch of science which deals with the study of (1) Teeth (2) Ontogeny (3) Bone (4) Ageing
Last Answer : Teeth
Description : (1) they contain free electrons Explanation: Metals typically consist of closepacked atoms, meaning that the atoms are arranged like closely packed spheres. Two packing motifs are common, one ... surrounded by six neighboring atoms. Several metals adopt both structures, depending on the temperature.
Last Answer : Helium gas is filled in ballons because (1) its atomic number is 2 (2) it is lighter than air (3) it is one of the constitutents of water (4) it is a noble gas
Description : The most common type of embryosac in Angiosperms is
Last Answer : The most common type of embryosac in Angiosperms is – Polygonum type
Description : When embryo arises directly from the (2n) sporophytic cells like nucellus or integuments it is called as
Last Answer : When embryo arises directly from the (2n) sporophytic cells like nucellus or integuments it is called as – Adventive embryony
Description : When polyembryony is due to activation of some sporophytic cells of ovule, it is called as
Last Answer : When polyembryony is due to activation of some sporophytic cells of ovule, it is called as – Adventive polyembryony
Description : In cereals, the layer containing specialized cells filled with starch are called
Last Answer : In cereals, the layer containing specialized cells filled with starch are called – Aleuron layer
Description : In roots, mitotically and metabolically inactive cells that are positioned just behind the root cap are called as
Last Answer : In roots, mitotically and metabolically inactive cells that are positioned just behind the root cap are called as – Quiescent center
Description : When many islands of phloem embedded in xylem layer due to anomalous activity of cambium are formed such phloems are known as
Last Answer : When many islands of phloem embedded in xylem layer due to anomalous activity of cambium are formed such phloems are known as – Included phloem
Description : Layering can be done on plants such as a) Bulbs b) bougainvillea c) Sugar cane d) Oleander
Last Answer : b) bougainvillea
Description : Layering can be done on plants such as a)bulbs b) Lime c) Sugar cane d) Oleander
Last Answer : b) Lime
Description : What is the law of evaporation of water from plant cells ?
Last Answer : Perspiration is the process by which water evaporates from a plant cell.
Description : What are the totiptent stem cells of plants ?
Last Answer : : Totiptent stem is the type of cell from which it is possible to produce plant seedlings directly.
Description : How many types of cells ?
Last Answer : There are two main types of cells based on the type of nucleus. Namely: (1) stem cell. (2) The actual cell.
Description : Consider the following statement: (1) In plant cells, cytokinesis start with the formation of the phragmoplast (2) Phragmoplast comprises intrazonal microtubules and Golgi vesicles (3) Primary cell wall is produced by microtubules (4) Phragmoplast is formed by nucleus
Description : With reference to plant tissue culture select the matching pair: (1) Sterile triploid—banana and seedless fruit (2) Somaclonal variations—differences appearing (3) Embryoids—non-zygatic embryo produced from somatic cells (4) Pulses—belong to cruciferae
Description : Nucleotide found free in the cells is: (a) CAMP (b) AMP (c) ADP (d) ATP
Last Answer : Ans. ((d))
Description : Retort cells are found in: (a) Funaria (b) Pogonatum (c) Sphagnum (d) Porella
Last Answer : Ans. ((c))
Description : Abscission layer developed during leaf fall is made of: (a) Cork cells (b) Sclerenchymatous cells (c) Sclerenchymatous cells (d) Parenchymatous cells
Description : The specific characters of C4 plant is: (a) Bulliform cells (b) Kranz anatomy (c) Parallel venation (d) Isobilateral leaf
Last Answer : Ans. ((b))
Description : Haploid cells belong to: (a) Integument, pollen grain, endosperm (b) Embryo, endosperm and pollen grain (c) Megaspore, pollen grain, antipodal (d) Integument, pollen grain and antipodal
Description : Golgi apparatus is absent in (a) Higher plants (b) Yeast (c) Bacteria and blue-green algae (d) Liver cells
Description : Rod-shaped elongated thick-walled lignified dead cells found in seed coat of pulses (Legumes) are (a) Macrosciereids (b) Astrosclereids (c) Brachysclereids (d) Osteosclereids
Description : Tyloses are: (a) Lactiferous channels (b) Secretory cells (c) Sieve plates (d) Tracheal plugs plugging the lumen of vessels and tracheids
Description : In the secondary culture, cells are obtained from a. primary culture b. the organism c. organ culture d. phenotypic culture
Last Answer : a. primary culture