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A train moving at a speed of $220 \text{ ms}^{-1}$ towards a stationary object, emits a sound of frequency $1000 \text{ Hz}$. Some of the sound reaching the object gets reflected back to the train as an echo. The frequency of the echo as detected by the driver of the train is (speed of sound in air is $330 \text{ ms}^{-1}$)
Identify the correct features of Mango and Coconut fruits. (i) In both, fruit is a drupe (ii) Endocarp is edible in both (iii) Mesocarp in Coconut is fibrous, and in Mango, it is fleshy (iv) In both, the fruit develops from the monocarpellary ovary Select the correct option from below:
Which of the following shows whorled phyllotaxy?
The roots that originate from the base of the stem are:
The ovary is half inferior in:
[Floral Formula] is the floral formula of:
Keel is the characteristic feature of a flower of:
A closely wound solenoid of 2000 turns and area of cross-section $1.5 \times 10^{-4} \text{ m}^2$ carries a current of $2.0 \text{ A}$. It is suspended through its centre and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field $5 \times 10^{-2} \text{ T}$ making an angle of $30^{\circ}$ with the axis of the solenoid. The torque on the solenoid will be
Identify the correct statement.
Which of the following is an example of a zygomorphic flower?
In the seeds of cereals, the outer covering of endosperm separates the embryo by a protein-rich layer called:
Given below are two statements: Statement I: In a floral formula, ⊕ stands for zygomorphic nature of the flower, and G stands for inferior ovary. Statement II: In a floral formula, ⊕ stands for actinomorphic nature of the flower and G stands for superior ovary. In the light of the above statements, choose the correct answer from the options given below:
Axile placentation is observed in:
Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency f Hz. The magnitude of magnetic induction at the center of the ring is :
Match List-I with List-II: List-I A. Scutellum B. Non-albuminous C. Epiblast D. Perisperm List-II I. Persistent nucellus II. Cotyledon of monocot seed III. Groundnut IV. Rudimentary cotyledon
In a pea flower, five petals are arranged in a specialized manner with one posterior, two lateral and two anterior. These are named as ________, ________ and ________ respectively.
In Calotropis, aestivation is:
Identify the type of flowers based on the position of calyx, corolla and androecium with respect to the ovary from the given figures (a) and (b).
An example of axile placentation is:
The restoring force of a spring, with a block attached to the free end of the spring, is represented by: