Question 1 :
Normal adult human male has
Question 2 :
Plants wilt due to excess of
Question 3 :
Monotremes are unique mammals because they
Question 4 :
Poison glands of snakes are homologous to
Question 5 :
Radical vascular bundles are those in which
With the help of examples, explain the various types of vascular bundles.
In angiosperms the vascular bundles are mainly of three types (i) radial (ii) conjoint (iii) concentric.
(i) Radial : Presence of radial vascular bundles is the characteristic feature of roots. Those vascular bundles in which xylem and phloem are present on different radii are known as radial vascular bundles. In between xylem and phloem bundles parenchymatous cells are present.
(ii) Conjoint : In these vascular bundles xylem and phloem are present on the same radii. Conjoint vascular bundles may be collateral (phloem is present only outer to xylem) or bicollateral (phloem is present on both sides of xylem). If cambium is present between xylem and phloem then the vascular bundle is known as open, otherwise it is called closed.
(iii) Concentric : Those vascular bundles in which one type of vascular tissue is surrounded by another type are known as concentric vascular bundles. These bundles may be amphivasal or leptocentric(phloem is completely surrounded by xylem) or amphicribal or hardocentric (xylem is completely surrounded by phloem). Amphivasal bundles are found in Dracaena and Yucca. Amphicribal bundles are found in stamens of many dicots etc.
Question 6 :
Plant bends towards the source of light on account of the movement of curvature known as
Question 7 :
Plant have ____ while animals lack it.
Question 8 :
Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane. What is incorrect in this statement?
Question 9 :
Photosynthesis is a process
Question 10 :
On which of the following plants did Gregor Mendal perform his classical experiment?
Question 11 :
Pigmentation of skin is due to
Question 12 :
Question 13 :
Night blindness is cause by lack of which vitamin?
Question 14 :
Monocot root differs from dicot root in having
Question 15 :
Radioactivity is a phenomenon of the spontaneous emission of
Question 16 :
Organic Substances which, in very small amounts, control growth and development called
Question 17 :
Our major foods, fibres, spices, fruits and beverage crops are
Question 18 :
Movements due to light are shown by
Question 19 :
Outer covering of virus made up of protein is
Question 20 :
Radish is a
Question 21 :
Most common disease of poultry in India is
Question 22 :
Most abundant tissues of our body are
Question 23 :
Mumps is a disease caused by
Question 24 :
Rain water helps to increase the ____ to some extent.
Question 25 :
Number of chromosomes in Down's syndrome is
Question 26 :
Plants are killed in winter by frost
Question 27 :
One of the following is most suitable for study of mutations
Question 28 :
Pulses are a good source of
Question 29 :
Oxygen in our blood is transported by a protein named
Question 30 :
Nymph is the name of young one of
Question 31 :
One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor's statement?
Question 32 :
Plants that grow under average temperature and moisture are called
Question 33 :
Oxyreductases, transferases, hydrolases, lyases, isomerases and ligases are all classes of
Question 34 :
Question 35 :
Pollination by wind is called
Question 36 :
Pollen grains in plants are produced in
Question 37 :
Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?
Question 38 :
Ptyalin is an enzyme produced in the
Question 39 :
Mycobacterium leprae causes leprosy, Corynebacterium diphtheria causes diphtheria and Vibrio comma causes
Vibrio cholerae (also Kommabacillus) is a gram negative comma-shaped bacterium with a polar flagellum that causes cholera in humans