22339 + Interview Questions in Biology in Class 11 Page 317 InterviewSolution

15801.	Question : Ligulate/strap-shaped corolla occursin sunflower in
Answer» Disc florets Immature florets Ray floretss Both ray and disc flower Solution :The fused petals from a STRAP-shaped structure TOWARDS the upper end. A small hairy outgrowth, the LIGULE is present at the junction of the strap and the tube, e.g., ray florets of Helianthus.

Discussion

15802.	Question : Lignin is most abundant in
Answer» Collenchyma Xylem Phloem Chlorenchyma Answer :B

Discussion

15803.	Question : Lignified tissues are
Answer» Permeable for gases, solutes and SOLVENTS Provided with SIMPLE or BORDERED PITS Meant for mechanical STRENGTH or conduction All of the above Answer :D

Discussion

15804.	Question : Lightly stained and transcriptionally active part of chromatin is called euchromatin/heterochromatin.
Answer» SOLUTION : EUCHROMATIN

Discussion

15805.	Question : Light saturation occurs at which percentage of full sunlight
Answer» 1 0.1 0.5 0.2 Answer :B

Discussion

15806.	Question : Light reaction takes place in the(A) chloroplast envelope(B) grana(C) stroma(D) cytoplasm
Answer» CHLOROPLAST envelope grana stroma cytoplasm ANSWER :B

Discussion

15807.	Question : Light reaction (Light phase) Dark reaction (Biosynthetic phase)
Answer» SOLUTION :

Discussion

15808.	Question : Light plays an important role in the life of all organism. Name any three physiological processes in plants which are affected by light.
Answer» Solution :THREE physiological PROCESSES in plant which are AFFECTED by light are : PHOTOSYNTHESIS, transpiration and flowering.

Discussion

15809.	Question : Light plays an important role is the life of all organisms. Name any two physiological processes in plants that are affected by light.
Answer» Solution : In PLANTS, LIGHT PLAYS vital role in photosynthesis and GROWTH.

Discussion

15810.	Question : Light harvesting complexes(LHC) are made up of hundreds of pipgment molecules bound to protiens. In LHC reaction centre is formed by
Answer» A single CHLOROPHYLL a molecule All the pigments except the one molecule of chlorophyll a Carotenoids and xanthophylls Both B and C Solution :Light HARVESTING complexes (LHC) are made up of hundreds of pigment molecules bound to proteins. In LHC, reaction CENTRE is formed by a single chlorophyll a molecule.

Discussion

15811.	Question : Lightas a particles is called …………. .
Answer» Nutron Quantum PHOTON Quantasome Answer :C

Discussion

15812.	Question : Ligaments
Answer» SOLUTION :LIGAMENTS CONNECT BONE to bone and JOINTS.

Discussion

15813.	Question : Ligament is mainly made up of :
Answer» Reticulin Elastin Myosin Collagen Answer :B

Discussion

15814.	Question : Life styles represented in protista are
Answer» PLANT like Animal like Fungal All the above Answer :D

Discussion

15815.	Question : Life span of the cells is determined by …………………………………………
Answer» KINETOCHORE Satellite Chromatin TELOMERE Solution :Telomere

Discussion

15816.	Question : Life span of Ascaris is
Answer» 3 to 6 MONTHS 6 to 9 months 9 to 12 months 12 to 18 months Answer :C

Discussion

15817.	Question : "Life results due to a relationship of molecules and isnot a property of any one molecule.' Comment upon the staterrient.
Answer» Solution :The famous biologist LINUS Pauling stated that, "Life results due to a relationship of molecules and is not a property of any one molecule." Life is predominantly organic in nature. Organic molecules are complex molecules containing carbon atoms. All other molecules are inorganic. Both types of molecules are essential. Without such inorganic molecules as water `(H_2O)`, carbon dioxide `(CO_2)` and molecular OXYGEN `(O_2)`, life would not be possible, but it is organic molecules that are responsible for the INCREDIBLE DIVERSITY of living things. Biologic diversity is a function of the capacity of carbon atoms to form large and complex molecules. This size and complexity gives almost unlimited potential for diversity of molecules but it also makes organic molecules much more fragile and easy to destroy than the SMALLER and simpler inorganic molecules. Both, micro- and macro-molecules are important to life.

Discussion

15818.	Question : Life is not possible without protein.
Answer» Solution :`-` Protein present in plansma membrane transports material across it. `-` Immunoglobulin protein, gives immunity against harmful pathogens. `-`Some proteins are structural component of HORMONES. `-`Protein is indespensible component of enzymes. `-` COLLAGEN is the most abundant protein in the animal world. `-` Ribulose biphosphate carboxylase (RuBisCo) is the most abundant protein in the whole of the biosphere. `-` Chlorophyll - for photo SYNTHESIS and HAEMOGLOBIN for the TRANSPORT of respiratory gases is essential. `-` Thus life is not possible without proteins.

Discussion

15819.	Question : Life cycle of Funaria is not completed without water. Choose the correct statement
Answer» As FERTILIZATION TAKES place in the presence of water only As Funaria is hydrophyte As plant is DELICATE and will dry without water As BRANCHES will not develop Answer :A

Discussion

15820.	Question : Life cycle of ectocarpus and fucus respectively are :
Answer» HAPLONTIC, Diplonitic Diplontic, Haplodiplontic Haplodiplontic, Diplontic Haplodiplontic, Haplontic Answer :C

Discussion

15821.	Question : Life cycle of Ectocarpus and Fucus respectively are…………………… .
Answer» HAPLONTIC, Diplontic Diplontic, Haplodiplontic Haplodiplontic, Diplontic Haplodiplontic, Halplontic SOLUTION : Haplodiplontic, Diplontic

Discussion

15822.	Question : Life cycle of Chlamydomonas is
Answer» HAPLONTIC Diplontic DIPLO - haplontic Diplobiontic Answer :A

Discussion

15823.	Question : Life cycle is diplontic in angiosperms .
Answer» SOLUTION :HAPLOID ( GAMETOPHYTIC PHASE ) is SHORT.

Discussion

15824.	Question : Life cycle in bryophytes is
Answer» Haplo - diplontic Diplontic Diplo - haplontic Haplontic Answer :A

Discussion

15825.	Question : Life cycle found in pteridophytes
Answer» HAPLONTIC diplontic haplo-diplontic either haplontic or diplontic Answer :(C)

Discussion

15826.	Question : Lichens play important role in biological succession and soil formation. Give the reason.
Answer» SOLUTION :1. Lichens growing on rocks SECRETE organic acids like oxalic acid. The acids enter the rock and produce a number of honey comb-like small crevices. 2. Moss SPORES are ABLE to GROW over such crevices and start the process of succession and soil formation.

Discussion

15827.	Question : Lichens have symbiotic relationship between(A) algae and bacteria(B) algae and fungus(C) bacteria and fungus(D) fern and bacteria
Answer» ALGAE and BACTERIA ALGA and fungus bacteria and fungus fern and bacteria

Discussion

15828.	Question : Lichens growing on soil, are called as saxicolous/terricolous.
Answer» SOLUTION :Terricolous

Discussion

15829.	Question : Lichens are well known combination of an alga and a fungus where fungus has (a) an epiphytic relationship with the alga(b) a parasitic relationship with the alga(c) a symbiotic relationship with the alga(d) a saprophytic relationship with the alga
Answer» an epiphytic RELATIONSHIP with the ALGA a PARASITIC relationship with the alga a SYMBIOTIC relationship with the alga a saprophytic relationship with the alga

Discussion

15830.	Question : Lichens are the pioneer organisms. Justify.
Answer» SOLUTION :1. Lichens are the pioneer organisms in the NEW terrains which colonise bare rocks, mountains and cliffs. 2. They corrode the rocks and accumulate a certain AMOUNT of minerals and organic matter. 3. The plants like mosses and GRASSES appear later in succession, utilizing the first soil formed by lichens. 4. Lichens thus, can convert a barren area into one that can support vegetation.

Discussion

15831.	Question : ______ are considered as pollution indicators.
Answer» Solution :Linchens are sensitive to AIR pollutants especially to sulphur-di-oxide. THEREFORE, they are considered as POLLUTION indicators.

Discussion

15832.	Question : Lichens are useful in the studies of atmospheric pollution because they
Answer» Solution :Lichens are SENSITIVE to AIR POLLUTANTS ESPECIALLY to sulphur-di-oxide. Therefore, they are considered as pollution.

Discussion

15833.	Question : Lichens are
Answer» Parasites Saprophytes SYMBIONTS Chemotrophs ANSWER :C

Discussion

15834.	Question : Lichens and mosses are observed in
Answer» Hydrosere Xerosere HYDRARCH succession Psammosere Answer :B

Discussion

15835.	Question : Lichen is usually cited as an example of ‘symbiosis' in plants where an algal and a fungal species live together for their mutual benefit. Which of the following will happen if algal and fungal partners are separated from each other? Based on your answer how do you justify this association as symbiosis ?
Answer» Both will survive and grow normally and independent from each other. Both will die Algal component will survive while the FUNGAL component will die. Fungal component will survive while algal partner will die. Solution :• Lichen is an example of symbiosis between algae and fungi. Both live TOGETHER for the benefit of each other. If both are separated then they die. • Fungi STORES water. It provides protection and ideal habitat to algae. In return algae provides carbohydrate rich food. If fungi is low in fixing NITROGEN then it provides nitrogen to fungi (nostoc) and this type of symbiosis dependent on each other help lichen to grow in dry and on open rocks. Where other plants can not survive. Moreover either algae or fungi alone can not grow there. • Thus both the components can not sustain WITHOUT each other.

Discussion

15836.	Question : Expand the acronyms LH
Answer» Luteinising HORMONE LANGERHANS hormone Low SECRETION hormone Luteotrophic hormone Answer :A

Discussion

15837.	Question :LH is also known as
Answer» SOLUTION :( INTERSTITIAL CELL STIMULATING HORMONE)

Discussion

15838.	Question : LH and FSH are collectively called
Answer» somatotropins OXYTOCIN gonadotropins luteotropic HORMONES. SOLUTION :Refer to answer 7

Discussion

15839.	Question : Leydig cells produce a group of hormones called
Answer» androgens estrogens aldosterone gonadotropins. Solution :The Leydig's cells present in the CONNECTIVE tissue between seminiferous TUBULES produce a group of HORMONES called androgens mainly TESTOSTERONE.

Discussion

15840.	Question : Leydig cells produce a group of hormones called ………….
Answer» Androgens Estrogens Aldosterone Gonadotropins Solution :Leydings cells / interstitial cells PRESENT in intercellular SPACES of seminiferous tubules. They secreted hormones of androgen GROUP, AMONG it testosterone is main.

Discussion

15841.	Question : Leydig cells in intertubular spaces secretes esterogen.
Answer» ANSWER :FALSE

Discussion

15842.	Question : _______level of dissolved oxygen in water indicates heavy pollution
Answer» 9 - 14 mg/L 8 mg/L 4 mg/L 0.5 mg/L Answer :D

Discussion

15843.	Question : Leucosin (Chrysolaminarin) is a carbohydrate which is stored as reserve food in case of
Answer» Diatom Euglena DINOFLAGELLATES PARAMECIUM ANSWER :A

Discussion

15844.	Question : Leucoplast :
Answer» Solution :LOCATION : SEEN in plants. It is also seen in different shape and size. It has stored food. Function : STORES starch, fat and PROTEIN.

Discussion

15845.	Question : Leucoplasts are plastids that
Answer» CARRY photosynthesis give COLOUR to fruits are colourless contain CAROTENOID pigments Answer :C

Discussion

15846.	Question : Less secretion of thyroxine results in stunted growth of person.
Answer» SOLUTION :Due to deficiency of thyroxine hormone results into rough, abnormal SKIN, thick tongue, faulty respiration. If such deficiency observed during PREGNANCY. Dwarfism, mental retardation sterility LIKE symptoms are seen. In mature person abnormal face, inflammation of body PARTS etc. are observed. Thus, less secretion of thyroxine affects the growth of an individual.

Discussion

15847.	Question : Lenticels are involved in
Answer» Transpiration Gaseous exchange Food transport Photosynthesis Answer :B

Discussion

15848.	Question : Lenticel and its complementary cells are developed through the activity of
Answer» Phellogen Stelar cambium Dermatogen Intercalary MERISTEM ANSWER :A

Discussion

15849.	Question : Length of one turn of the helix in a B form DNA is approximately
Answer» 3.4 NM 2nm 0.34nm 20 nm ANSWER :A

Discussion

15850.	Question : Length of petiole increases due to division of
Answer» APICAL MERISTEM LATERAL meristem lntercalary meristem All of these ANSWER :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : Ligulate/strap-shaped corolla occursin sunflower in

Question : Lignin is most abundant in

Question : Lignified tissues are

Question : Lightly stained and transcriptionally active part of chromatin is called euchromatin/heterochromatin.

Question : Light saturation occurs at which percentage of full sunlight

Question : Light reaction takes place in the(A) chloroplast envelope(B) grana(C) stroma(D) cytoplasm

Question : Light reaction (Light phase) Dark reaction (Biosynthetic phase)

Question : Light plays an important role in the life of all organism. Name any three physiological processes in plants which are affected by light.

Question : Light plays an important role is the life of all organisms. Name any two physiological processes in plants that are affected by light.

Question : Light harvesting complexes(LHC) are made up of hundreds of pipgment molecules bound to protiens. In LHC reaction centre is formed by

Question : Lightas a particles is called …………. .

Question : Ligaments

Question : Ligament is mainly made up of :

Question : Life styles represented in protista are

Question : Life span of the cells is determined by …………………………………………

Question : Life span of Ascaris is

Question : "Life results due to a relationship of molecules and isnot a property of any one molecule.' Comment upon the staterrient.

Question : Life is not possible without protein.

Question : Life cycle of Funaria is not completed without water. Choose the correct statement

Question : Life cycle of ectocarpus and fucus respectively are :

Question : Life cycle of Ectocarpus and Fucus respectively are…………………… .

Question : Life cycle of Chlamydomonas is

Question : Life cycle is diplontic in angiosperms .

Question : Life cycle in bryophytes is

Question : Life cycle found in pteridophytes

Question : Lichens play important role in biological succession and soil formation. Give the reason.

Question : Lichens have symbiotic relationship between(A) algae and bacteria(B) algae and fungus(C) bacteria and fungus(D) fern and bacteria

Question : Lichens growing on soil, are called as saxicolous/terricolous.

Question : Lichens are well known combination of an alga and a fungus where fungus has (a) an epiphytic relationship with the alga(b) a parasitic relationship with the alga(c) a symbiotic relationship with the alga(d) a saprophytic relationship with the alga

Question : Lichens are the pioneer organisms. Justify.

Question : ______ are considered as pollution indicators.

Question : Lichens are useful in the studies of atmospheric pollution because they

Question : Lichens are

Question : Lichens and mosses are observed in

Question : Expand the acronyms LH

Question :LH is also known as

Question : LH and FSH are collectively called

Question : Leydig cells produce a group of hormones called

Question : Leydig cells produce a group of hormones called ………….

Question : Leydig cells in intertubular spaces secretes esterogen.

Question : _______level of dissolved oxygen in water indicates heavy pollution

Question : Leucosin (Chrysolaminarin) is a carbohydrate which is stored as reserve food in case of

Question : Leucoplast :

Question : Leucoplasts are plastids that

Question : Less secretion of thyroxine results in stunted growth of person.

Question : Lenticels are involved in

Question : Lenticel and its complementary cells are developed through the activity of

Question : Length of one turn of the helix in a B form DNA is approximately

Question : Length of petiole increases due to division of