Question
Major changes that occurred in human evolution.
✓
Answer
- Major changes that took place in evolution of man are as follows :
- Increase in size and complexity of brain and enhanced intelligence.
- Increase in cranial capacity.
- Bipedal locomotion.
- Opposable thumb.
- Erect posture.
- Shortening of forelimbs and lengthening of hind limbs.
- Development of chin. Orthognathous face.
- Broadening of pelvic girdle and development of lumbar curvature.
- Social and cultural development such as articulated speech, art, development of tools, etc.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Give the graphical representation of pleiotropy to show inheritance of Sickle-cell anaemia.
Adaptations of mammals in colder regions.
Study the graph given below and answer the questions that follow:
Explain the ovarian events (i), (ii) and (iii) under the influence of hormones ‘X’ and ‘Y’.
Explain the ovarian events (i), (ii) and (iii) under the influence of hormones ‘X’ and ‘Y’.
What are cyanobacteria? Give any two examples cyanobacteria as biofertilizers.
Complete the table given below by putting a tick (✓) in the boxes where applicable.
| Action | Reflex | Voluntary |
| 1. Touching a hot object | ———- | ———– |
| 2. Releasing saliva on smelling food | ———– | ———— |
| 3. Applying a car’s brakes in an emergency | ———— | ————– |
| 4. Blinking of eyes when a small insect touches the eye | ———– | ———— |
- List the three different allelic forms of gene ‘I’ in humans. Explain the different phenotypic expressions, controlled by these three forms.
- A woman with blood group'A'marries a man with blood group 'O'. Discuss the possibilities of the inheritance of the blood groups in the following, starting with 'yes' or 'no' for each:
- They produce children with blood group ‘A’ only.
- They produce children, some with 'O' blood group and some with 'A' blood group.
The zygote passes through several developmental stages till implantation, Describe each stage briefly with suitable diagrams.
Explain the components of a transcription unit with the help of a diagram?
| Substance | Potential benefit | Crop | Transgene |
| Provitamin A | Anti-oxidant | ————– | Phytoene synthase, Lycopene cyclase |
| Fructans | ————– | Sugarbeet | —————- |
| Vitamin E | —————- | Canola | γ -tocopherol methyl transferase |
| Flavonoids | Anti-oxident | Tomato | ————– |
| ————– | Iron fortification | Rice | Ferritin, metallothioein, phytase |
What is the ecological process behind the biological control method of managing with pest insects?