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If you are asked to classify the various algae into distinct groups, which of the following characters you should choose?
Given below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence: A. Prothallus stage B. Meiosis in spore mother cells C. Fertilisation D. Formation of archegonia and antheridia in gametophyte
A 250 turn rectangular coil of length $2.1 \text{ cm}$ and width $1.25 \text{ cm}$ carries a current of $85 \, \mu\text{A}$ and subjected to the magnetic field of strength $0.85 \text{ T}$. Work done for rotating the coil by $180^{\circ}$ against the torque is:
Ionized hydrogen atoms and $\alpha$-particles with the same momenta enter perpendicular to a constant magnetic field, $B$. The ratio of their path radii $r_H : r_\alpha$ will be:
Hydrocolloid carrageen is obtained from:
In oogamy, fertilization involves:
Which of the following is incorrectly matched?
Which of the following is the correct match?
A moving coil galvanometer has a resistance of $50\ \Omega$ and gives full scale deflection for $10\ \text{mA}$. How could it be converted into an ammeter with a full scale deflection for $1\ \text{A}$?
Match the plant with the kind of life cycle it exhibits: List-I (a) Spirogyra (b) Fern (c) Funaria (d) Cycas List-II (i) Dominant diploid sporophyte vascular plant, with highly reduced male or female gametophyte (ii) Dominant haploid free-living gametophyte (iii) Dominant diploid sporophyte alternating with reduced gametophyte called prothallus (iv) Dominant haploid leafy gametophyte alternating with partially dependent multicellular sporophyte
Sexual reproduction in Spirogyra is an advanced feature because it shows:
The phenetic classification of organisms is based on:
Identify the incorrect pair regarding the classification of Pteridophytes:
A galvanometer has 30 divisions and a sensitivity $16\ \mu\text{A/div}$. It can be converted into a voltmeter to read $3\ \text{V}$ by connecting (approximately):
Cycas have two cotyledons but are not included in angiosperms because of:
A student observed algae with chlorophyll 'a', 'd', and phycoerythrin. It should belong to:
Water is essential for Bryophyta:
When one CO2 molecule is fixed, which of the following photochemically made, high energy chemical intermediates are used in the reduction phase of the Calvin cycle?
The products of light reaction in photosynthesis are:
Which among the curves shown in the figure represents electrostatic field lines?