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What is the time period of approximately 270 days, during which the foetus develops within the uterus, called?

Crossing over between chromatids can occur only between

'Flocks' is

Briefly discuss the Theory of Natural Selection as given by Darwin.

Which of the following statement is incorrect with respect to variations?
(a) all variations in a species have an equal chance of survival
(b) change in genetic composition results in variations
(c) selection of variations by environmental factors torus the basis of the evolutionary process
(d) variations are the minimum in asexual reproduction

Identify the phenomena labelled P, Q and R in the given image

If an ovum gives rise to a plant without being fertilised, this process is called _________________

In which of the following grafting is very useful:

What is the best choice of alternative fuel?

Some great author has said that a population explosion is far more dangerous than an atomic explosion. Justify this statement?

How does one increase the MA of a class II lever?

Sometimes you remember a vivid picture of a dream you saw. What is the role of your eyes in this experience?

Breathing cycle is rhythmic whereas exchange of gasses is a continuous process. Explain.

What are vascular muscles?

Consider the following statements about Beti Bachao-Beti Padhao (BBBP) campaign

Which of the above statements is/are correct

Which of the following vitamin is insoluble in water?

Who discovered the basic principles of genetics?

The __ schedule indicates the stages at which the vaccinations and inoculations have to be given to safeguard children against different diseases.

During synaptic transmission of nerve impulse, a neurotransmitter (P) is released from synaptic vesicles by the action of ions (Q). Choose the correct P and Q

Compare and contrast nervous and hormonal mechanisms for control and coordination in animals. [5 MARKS]

A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis in order to

(a) remove chlorophyll from the leaves.

(b) remove starch from the leaves.

(c) ensure that no photosynthesis occurred.

(d) ensure that the leaves are free from starch.

Which part of the alimentary canal receives bile from the liver ?
(a) Oesophagus (b) Small intestine (c) Stomach (d) Large intestine.

______ is mating between two individuals with different alleles at one genetic locus of interest.

Give the contrasting traits of the following characters in pea plant and mention which is dominant and which is recessive :

(a) Yellow seed, green seed (b) Round seed, wrinkled seed

Explain Transpiration in detail.

Which among the following possess unidirectional valves?

Apical dominance phenomenon is caused by :

(a) auxins (b) GA

(c) cytokinins (d) ABA

Why does bright red colour blood turn dark once circulation begins?

The smallest blood vessel of the circulatory system is ___.

The group of Anamniota includes

Which among the following gland acts as a biological clock?

“Nothing lives forever, but life continues.” What does it mean?

A small part of the shoot of a plant is removed with a sharp knife. When the lower end of this small part of the shoot is buried in moist soil, it gradually develops roots and shoots and grows to become a new plant.
(a) What is the name of this method of propagating plants?
(b) What care should be taken while removing a small part of the shoot from the parent plant with a knife?
(c) Name any two plants which provide us with food directly or indirectly and are grown by this method.
(d) Give one advantage of this method of producing new plants.
(e) State whether it is a sexual method of reproduction or an asexual method. Why?
(f) What special name can be given to the genetically identical new plants produced by this technique?

To which directional stimuli do :

(a) roots respond?

(b) shoots respond?

Round latex caps with coil springs fitted deep in the vagina on the mouth of the uterus. Which barrier method is being described here?

Which of the following devices are used to get three-dimensional visuals of internal organs?

Give two examples of turgor movements in plants.

Describe the role of the thyroid gland in human body.

The form of energy used in respiration is:

Disease caused by eating fish found in water contaminated with the industrial waste of mercury:

Aqueous humour is replenished by

Question 121

What's the error? Reeta evaluated - 4 + d for d = - 6 and gave an answer of 2. What might Reeta have done wrong?

Mendel conducted his breeding experiments on __________.

(a) Name the scientist who gave the laws of inheritance.

(b) Name an animal in which individuals can change sex. What does this indicate ?

What is the function of the receptors In our body?Think of situations where receptors do not work properly. What problems are likely to arise?(4+5=9 marks) Please describe elaborately with example.

Choose the word which is most OPPOSITE in meaning to the word as used in the passage:

Fecund